Date: Wed, 10 Aug 2011 10:04:34 -0400 From: Dan Rosenberg <dan.j.rosenberg@...il.com> To: oss-security@...ts.openwall.com Cc: ocert-announce@...ts.ocert.org Subject: Re: [oCERT-2011-002] libavcodec insufficient boundary check On Wed, Aug 10, 2011 at 9:19 AM, Daniele Bianco <danbia@...rt.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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