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TITLE:
libvorbis Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA26232

VERIFY ADVISORY:
http://secunia.com/advisories/26232/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
libvorbis 1.x
http://secunia.com/product/14933/

DESCRIPTION:
David Thiel has reported some vulnerabilities in libvorbis, which can
be exploited by malicious people to cause a DoS (Denial of Service)
and potentially compromise an application using the library.

1) A boundary error exists in the way the "_01inverse()" function in
res.c processes "blocksize_0" and "blocksize_1" values, which can be
exploited to cause a heap overwrite.

2) A boundary error exists in the way the "vorbis_info_clear()"
function in info.c processes invalid mapping types, which can be
exploited to trigger a call to a value outside the dispatch table.

3) Invalid "blocksize" values passed to the "vorbis_dsp_clear()"
function in block.c result in an invalid memory access, which can be
exploited to cause a DoS.

The vulnerabilities are reported in version 1.1.2. Prior versions may
also be affected.

SOLUTION:
Update to version 1.2.0.
http://downloads.xiph.org/releases/vorbis/libvorbis-1.2.0.tar.gz

PROVIDED AND/OR DISCOVERED BY:
Discovered by David Thiel, iSEC Partners.

CHANGELOG:
2007-07-27: Added CVE reference.

ORIGINAL ADVISORY:
http://www.isecpartners.com/advisories/2007-003-libvorbis.txt

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