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TITLE:
FFmpeg 4xm Processing Memory Corruption Vulnerability

SECUNIA ADVISORY ID:
SA33711

VERIFY ADVISORY:
http://secunia.com/advisories/33711/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
FFmpeg 0.x
http://secunia.com/advisories/product/6372/

DESCRIPTION:
Tobias Klein has reported a vulnerability in FFmpeg, which
potentially can be exploited by malicious people to compromise an
application using the library.

The vulnerability is caused due to a signedness error within the
"fourxm_read_header()" function in libavformat/4xm.c. This can be
exploited to corrupt arbitrary memory via a specially crafted 4xm
file.

Successful exploitation may allow execution of arbitrary code.

SOLUTION:
Fixed in the SVN repository at revision 16846.
http://svn.mplayerhq.hu/ffmpeg?view=rev&revision=16846

PROVIDED AND/OR DISCOVERED BY:
Tobias Klein

ORIGINAL ADVISORY:
Tobias Klein:
http://www.trapkit.de/advisories/TKADV2009-004.txt

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