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TITLE:
OpenBSD XMM Exceptions Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA36956

VERIFY ADVISORY:
http://secunia.com/advisories/36956/

DESCRIPTION:
A vulnerability has been reported in OpenBSD, which can be exploited
by malicious, local users to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the processing of
XMM exceptions, which can be exploited to e.g. cause a kernel panic.

Successful exploitation requires that the system is running an i386
kernel.

The vulnerability is reported in OpenBSD 4.4, 4.5, and 4.6. Other
versions may also be affected.

SOLUTION:
Apply patches.

OpenBSD 4.4:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/i386/015_xmm.patch

OpenBSD 4.5:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/i386/008_xmm.patch

OpenBSD 4.6:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.6/i386/002_xmm.patch

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Slava Pestov.

ORIGINAL ADVISORY:
http://marc.info/?l=openbsd-security-announce&m=125474331811594

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