I. BACKGROUND
Lyrics3 is a system for embedding the lyrics inside an MP3 song file.
The Winamp media player has support for this protocol. More information
about Winamp is available at the following site:
http://www.winamp.com
II. DESCRIPTION
Remote exploitation of a heap-based buffer overflow vulnerability in the
Lyrics3 parsing code in AOL Corp.'s Nullsoft Winamp media
player could allow an attacker to execute arbitrary code in the context
of the currently logged in user.
Due to an error in the parsing of certain Lyrics3 tags, a malicious
server can cause the Winamp client to allocate a very small amount of
space and then try fill it with a large amount of server supplied date,
potentially overwriting values which will lead to code execution.
III. ANALYSIS
Exploitation allows remote attackers to execute code in the context of
the user who started Winamp. Exploitation requires that attackers social
engineer victims into connecting to a server. This can be accomplished
by embedding a link in a web page to a playlist file, a 'shout:' URI or
a 'uvox:' URI, which are automatically loaded by Winamp from Internet
Explorer. Alternatively, one of these items could be placed in a
playlist file. However, attackers cannot force users to open the content
they have supplied.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in version
5.24 and 5.3 of Nullsoft Winamp. Previous versions also may be affected.
V. WORKAROUND
iDefense is currently unaware of any effective workarounds for this
vulnerability.
VI. VENDOR RESPONSE
Nullsoft has released version 5.31 of Winamp to address this problem.
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
10/19/2006 Initial vendor notification
10/25/2006 Initial vendor response
10/25/2006 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright © 2006 iDefense, Inc.
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Disclaimer: The information in the advisory is believed to be
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There are no warranties with
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