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TITLE:
OpenBSD bgpd Long AS Path Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA33975

VERIFY ADVISORY:
http://secunia.com/advisories/33975/

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

The vulnerability is caused due to an error within the
"aspath_prepend()" function in usr.sbin/bgpd/rde_attr.c when
prepending its own AS to a long AS path. This can be exploited to
crash the process by advertising long AS paths.

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/010_bgpd.patch

OpenBSD 4.4:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/common/010_bgpd.patch

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

ORIGINAL ADVISORY:
http://openbsd.org/errata44.html#010_bgpd

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