xine-lib, FFmpeg: Heap-based buffer overflow

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.

Workaround

There is no known workaround at this time.

Resolution

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

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

All FFmpeg users should upgrade to the latest version:

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