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Re: [oCERT-2011-002] libavcodec insufficient boundary check
From: Dan Rosenberg <dan.j.rosenberg () gmail com>
Date: Wed, 10 Aug 2011 10:04:34 -0400

On Wed, Aug 10, 2011 at 9:19 AM, Daniele Bianco <danbia () ocert org> wrote:

#2011-002 libavcodec insufficient boundary check

Description:

The libavcodec library, an open source video encoding/decoding library part
of the FFmpeg and Libav projects, performs insufficient boundary check
against a buffer index. The missing check can result in arbitrary read/write
of data outside a destination buffer boundaries.

The vulnerability affects the Chinese AVS video (CAVS) file format decoder,
specially crafted CAVS files may lead to arbitrary code execution during
decoding.


While you're at it, here are a couple more:

* Out-of-bounds read on lines 166-171 due to signedness error
* Out-of-bounds read on lines 224-240 due to signedness error

Line numbers based on upstream git:
http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavcodec/cavsdec.c;h=acf040788c9a4c34807ba2efa10312b5b8e84f02;hb=6481a36010d8f7d834676f17ba555d0a3815c760


Hint to distributions and software developers: if you're going to use
libavcodec (or libavformat, etc.) for your project, consider
restricting the default build to include only *commonly* used codecs
and demuxers.  The code quality of many of the more obscure formats is
questionable at best.

Regards,
Dan


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