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TITLE:
OpenBSD Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA29078

VERIFY ADVISORY:
http://secunia.com/advisories/29078/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
OpenBSD 4.1
http://secunia.com/product/16044/
OpenBSD 4.2
http://secunia.com/product/16045/

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

1) An error within the "ip6_check_rh0hdr()" function in
sys/netinet6/ip6_input.c can be exploited to cause a kernel panic via
malformed IPV6 routing headers.

The vulnerability is reported in OpenBSD 4.2.

2) An error within the "tcp_respond()" function in
sys/netinet/tcp_subr.c can be exploited to cause a kernel panic via
specially crafted TCP packets.

The vulnerability is reported in OpenBSD 4.1 and 4.2. Other versions
may also be affected.

SOLUTION:
Apply vendor patches.

OpenBSD 4.1:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.1/common/013_tcprespond.patch

OpenBSD 4.2:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/007_tcprespond.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/008_ip6rthdr.patch

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

ORIGINAL ADVISORY:
http://www.openbsd.org/errata41.html
http://www.openbsd.org/errata42.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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