Technical Description

Multiple vulnerabilities have been identified in Libvorbis, which could be exploited by attackers to cause a denial of service or execute arbitrary code.

The first issue is caused by a heap overwrite error within the "_01inverse()" [res0.c] function when processing invalid "blocksize_0" and "blocksize_1" values, which could be exploited by attackers to execute arbitrary code.

The second vulnerability is caused by an invalid mapping type within the "vorbis_info_clear()" [info.c] function, which could be exploited to execute arbitrary code.

The third issue is caused by an error in "block.c" when handling invalid blocksize values, which could be exploited to crash an affected application, creating a denial of service condition.

Other security issues related to the handling of OOG audio file have been reported.

Affected Products

Libvorbis versions prior to 1.2.0

Solution

Upgrade to Libvorbis version 1.2.0 :
http://downloads.xiph.org/releases/vorbis/libvorbis-1.2.0.tar.bz2

References

http://www.vupen.com/english/advisories/2007/2698
http://www.isecpartners.com/advisories/2007-003-libvorbis.txt

Credits

Vulnerabilities reported by David Thiel (iSEC Partners).

ChangeLog

2007-07-30 : Initial release
2007-09-18 : Updated Description

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