[SA23608] OpenBSD "vga" Privilege Escalation Vulnerability

[Secunia Security Advisories <[EMAIL PROTECTED]>]

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TITLE:
OpenBSD "vga" Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA23608

VERIFY ADVISORY:
http://secunia.com/advisories/23608/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
OpenBSD 4.0
http://secunia.com/product/12486/
OpenBSD 3.x
http://secunia.com/product/100/

DESCRIPTION:
A vulnerability has been reported in OpenBSD, which can be exploited
by malicious, local users to gain escalated privileges.

The vulnerability is caused due to an input validation error in
sys/dev/pci/vga_pci.c of "vga" (VGA graphics driver for wscons),
which can be exploited to gain escalated privileges.

Successful exploitation may allow to gain root privileges, but
requires that the kernel is compiled with "option PCIAGP" (by default
only available for i386) and that the device is not AGP compatible.

The vulnerability is reported in OpenBSD 3.9 and 4.0. Other versions
may also be affected.

SOLUTION:
Apply patch.

OpenBSD 3.9:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/i386/017_agp.patch

OpenBSD 4.0:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/i386/007_agp.patch

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://www.openbsd.org/errata.html#agp

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