bugtraq - Path disclosure in MyBB

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Message-Id: <201010271047.o9RAl5SY020387@htbridge.ch>
Date: Wed, 27 Oct 2010 12:47:05 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: Path disclosure in MyBB 

Vulnerability ID: HTB22654
Reference: http://www.htbridge.ch/advisory/path_disclosure_in_mybb.html
Product: MyBB
Vendor: MyBB ( http://www.mybb.com ) 
Vulnerable Version: 1.6 
Vendor Notification: 13 October 2010 
Vulnerability Type: Path disclosure
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Low 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
The vulnerability exists due to failure in the "/forumdisplay.php" script to properly sanitize user-supplied input in mybb[forumread] variable from cookie, it's possible to generate an error that will reveal the full path of the script.
A remote user can determine the full path to the web root directory and other potentially sensitive information.

Cookie: mybb[forumread]=%4f%3a%31%3a%22%31%22%3a%31%3a%7b%73%3a%31%3a%22%31%22%3b%61%3a%32%3a%7b%69%3a%30%3b%73%3a%31%3a%22%31%22%3b%69%3a%31%3b%73%3a%31%3a%22%32%22%3b%7d%7d;