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TITLE:
OpenBSD Packet Filter Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA34676

VERIFY ADVISORY:
http://secunia.com/advisories/34676/

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

The vulnerability is caused due to a NULL-pointer dereference error
in the packet filter ("pf") implementation when performing packet
translations. This can be exploited to cause a kernel panic via a
specially crafted IP packet.

Successful exploitation may require that a translation rule defining
a protocol pertaining to an inadequate IP version is configured.

The vulnerability is reported in OpenBSD 4.3 and 4.4. Other versions
may also be affected.

SOLUTION:
Apply patches.

OpenBSD 4.3:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.3/common/013_pf.patch

OpenBSD 4.4:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/common/013_pf.patch

PROVIDED AND/OR DISCOVERED BY:
Rembrandt

CHANGELOG:
2009-04-13: Updated credits and added reporter link to the "Original
Advisory" section.

ORIGINAL ADVISORY:
OpenBSD:
http://www.openbsd.org/errata44.html

Rembrandt:
http://helith.net/txt/openbsd_4.3-current_pf_null_pointer_dereference_kernel_panic.txt

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