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Shell create & command execution in JAF CMS

Vulnerability ID: HTB22665
Reference: http://www.htbridge.ch/advisory/shell_create__command_execution_in_jaf_cms.html
Product: JAF CMS
Vendor: JAF CMS ( http://jaf-cms.sourceforge.net/ ) 
Vulnerable Version: 4.0 RC2
Vendor Notification: 21 October 2010 
Vulnerability Type: Shell create & command execution
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: High 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
The vulnerability exists due to failure in the "/module/log/vislog.php" script to properly sanitize user-supplied input, it's possible to create/read any file.

The following PoC is available:

creating shell:


command execute: