The libvorbis packages contain runtime libraries for use in programs thatsupport Ogg Vorbis. Ogg Vorbis is a fully open, non-proprietary, patent-androyalty-free, general-purpose compressed audio format.An insufficient input validation flaw was found in the way libvorbisprocesses the codec file headers (static mode headers and encoding books)of the Ogg Vorbis audio file format (Ogg). A remote attacker could providea specially-crafted Ogg file that would cause a denial of service (memorycorruption and application crash) or, potentially, execute arbitrary codewith the privileges of an application using the libvorbis library whenopened by a victim. (CVE-2009-2663)Users of libvorbis should upgrade to these updated packages, which containa backported patch to correct this issue. The desktop must be restarted(log out, then log back in) for this update to take effect.