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libvorbis Multiple Memory Corruption Flaws
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SUMMARY
libvorbis 1.1.2 contains several vulnerabilities allowing heap overwrite,
read violations and a function pointer overwrite. These bugs cause a at
least a denial of service, and potentially code execution.
DETAILS
Vulnerable Systems:
* libvorbis version 1.1.2 and prior
Immune Systems:
* libvorbis version 1.2.0 and newer
Invalid blocksize_0 and blocksize_1 values result in a heap overwrite in
the _01inverse() function of res0.c.
An invalid mapping type causes an out of bounds dispatch table lookup,
offset by an attacker-controlled value, during cleanup in
vorbis_info_clear() in info.c.
Additionally, invalid blocksize values cause a segmentation fault on read
in block.c.
Fix Information:
These issues are resolved in libvorbis 1.2.0, available at:
<http://downloads.xiph.org/releases/vorbis/libvorbis-1.2.0.tar.bz2>
http://downloads.xiph.org/releases/vorbis/libvorbis-1.2.0.tar.bz2
ADDITIONAL INFORMATION
The information has been provided by <mailto:david@isecpartners.com>
David Thiel.
The original article can be found at:
<http://www.isecpartners.com/advisories/2007-003-libvorbis.txt>
http://www.isecpartners.com/advisories/2007-003-libvorbis.txt
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