xine-lib, FFmpeg: Heap-based buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200601-06 / xine-lib ffmpeg
Release Date	January 10, 2006
Latest Revision	January 10, 2006: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/xine-lib	< 1.1.1-r3	>= 1.1.1-r3	All supported architectures
media-video/ffmpeg	< 0.4.9_p20051216	>= 0.4.9_p20051216	All supported architectures

Related bugreports: #115849, #116181

Synopsis

xine-lib and FFmpeg are vulnerable to a buffer overflow that may be exploited by attackers to execute arbitrary code.

2. Impact Information

Background

xine is a GPL high-performance, portable and reusable multimedia playback engine. xine-lib is xine's core engine. FFmpeg is a very fast video and audio converter and is used in xine-lib.

Description

Simon Kilvington has reported a vulnerability in FFmpeg libavcodec. The flaw is due to a buffer overflow error in the "avcodec_default_get_buffer()" function. This function doesn't properly handle specially crafted PNG files as a result of a heap overflow.

Impact

A remote attacker could entice a user to run an FFmpeg based application on a maliciously crafted PNG file, resulting in the execution of arbitrary code with the permissions of the user running the application.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All xine-lib users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/xine-lib-1.1.1-r3"

All FFmpeg users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-video/ffmpeg-0.4.9_p20051216"

4. References

Updated January 10, 2006

Summary: This is a Gentoo Linux Security Advisory

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