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TITLE:
OpenBSD BGP UPDATE Message Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA33752

VERIFY ADVISORY:
http://secunia.com/advisories/33752/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
OpenBSD 4.3
http://secunia.com/advisories/product/19365/
OpenBSD 4.4
http://secunia.com/advisories/product/19640/

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 an error while processing BGP
UPDATE messages having an invalid AS4_PATH. This can be exploited to
terminate a BGP session and potentially disrupt network connectivity
via a specially crafted BGP UPDATE message.

SOLUTION:
Apply vendor patches.

OpenBSD 4.3:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.3/common/009_bgpd.patch

OpenBSD 4.4:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/common/009_bgpd.patch

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

ORIGINAL ADVISORY:
http://www.openbsd.org/errata44.html
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/bgpd/rde.c?rev=1.230.2.1

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