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TITLE:
OpenBSD IPv6 Type 0 Route Headers Denial of Service

SECUNIA ADVISORY ID:
SA24978

VERIFY ADVISORY:
http://secunia.com/advisories/24978/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

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 people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the processing of
certain IPv6 type 0 route headers. This can be exploited to cause a
DoS by sending specially crafted IPv6 packets to a vulnerable
system.

Note: The vendor claims that the vulnerability is caused due to a
design flaw within the IPv6 protocol.

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

SOLUTION:
Apply patches.

OpenBSD 3.9:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/022_route6.patch

OpenBSD 4.0:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/012_route6.patch

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

ORIGINAL ADVISORY:
http://openbsd.org/errata40.html#012_route6

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