Winamp m3u/pls .WMA Extension Buffer Overflow Vulnerability
iDefense Security Advisory 02.01.06 http://www.idefense.com/intelligence/vulnerabilities/display.php?id=378 February 1, 2006
Winamp is a popular media player for Windows which supports many audio/video file formats.
More information can be obtained from the vendors site at:
It has been found that a specially crafted m3u or pls file with a target filename having the .wma extension can crash Winamp giving the attacker control over the EAX register.
Example m3U file format:
Example pls file format:
[playlist] numberofentries=5 File1=AAAA[...]AA.wma Title1= Length5=-1 Version=2
The crash occurs in the Winamp module with the following instructions:
mov edx, [eax] call [edx+24]
The number of characters that can be inject is limited. With control of the EAX register injected into the above code, meaningful shellcode execution is possible.
This vulnerability has been verified in version 5.094 of Winamp.
Removing the file mapping for m3u and pls files to Winamp should mitigate the risk of exploitation.
VI. VENDOR RESPONSE
The vendor has not responded to communication regarding this vulnerability.
The vulnerability appears to have been silently fixed in Winamp 5.11. Version 5.13 is now available for download at:
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2005-3188 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
VIII. DISCLOSURE TIMELINE
10/12/2005 Initial vendor notification 02/01/2006 Coordinated public disclosure
This vulnerability was discovered by b0f.
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X. LEGAL NOTICES
Copyright (c) 2006 iDefense, Inc.
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