NSFOCUS Security Advisory (SA2006-01)

Winamp m3u File Processing Buffer Overflow Vulnerability

Release Date: 2006-02-23

CVE ID: CVE-2006-0720

http://www.nsfocus.com/english/homepage/research/0601.htm

Affected systems & software
===========================

Nullsoft Winamp 5.12
Nullsoft Winamp 5.13

Unaffected systems & software
=============================

Nullsoft Winamp 5.2

Summary
=========

Winamp is a popular media player that supports various media formats and 
playlist formats, including m3u and pls formats.

NSFocus Security Team discovered a buffer overflow vulnerability when Winamp 
processes .m3u files, which might cause Winamp to crash or even execute 
arbitrary code when a user load a malicious .m3u file and play. 

Description
============

Winamp can play files by loading .m3u file. When the playing is paused or stopped,
Winamp will reset the title of the program, where function strncpy() is incorrectly
called, resulting in a static buffer overflow.

An attacker can cause winamp to crash by crafting a malicious .m3u file. 
Remote code execution is possible but difficult.

Workaround
=============

Cancel .m3u file association to Winamp, and do not open untrusted .m3u files. 

Vendor Status
==============

2006.02.13  Informed the vendor.
2006.02.15  The vendor confirmed the vulnerability.
2006.02.21  The vendor releases a new version to fix the vulnerability.

The vendor has released Winamp 5.2 to fix this vulnerability, which is available 
for download at:
http://www.winamp.com/player/
http://forums.winamp.com/showthread.php?threadid=238648

Additional Information
========================

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-0720 to this issue. This is a candidate for inclusion in the 
CVE list (http://cve.mitre.org), which standardizes names for security problems.
Candidates may change significantly before they become official CVE entries.

Acknowledgment
===============

Liu Yexin of NSFocus Security Team found the vulnerability.

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==========
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NSFOCUS Security Team <security@nsfocus.com>
NSFOCUS INFORMATION TECHNOLOGY CO.,LTD
(http://www.nsfocus.com)