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TITLE:
FreeBSD ICMPv6 "Packet Too Big" MTU Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA31745

VERIFY ADVISORY:
http://secunia.com/advisories/31745/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
FreeBSD 6.x
http://secunia.com/product/6778/

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

The vulnerability is caused due to an error within the
"icmp6_mtudisc_update()" function in src/sys/netinet6/icmp6.c when
processing ICMPv6 "Packet Too Big" messages. This can be exploited to
cause the IPv6 stack to panic by sending specially crafted ICMPv6
messages to a vulnerable system.

Note: The vulnerability only affects systems with IPv6 support.

SOLUTION:
Update FreeBSD or apply patches.

2008-09-03 19:09:47 UTC (RELENG_7, 7.1-PRERELEASE)
2008-09-03 19:09:47 UTC (RELENG_7_0, 7.0-RELEASE-p4)
2008-09-03 19:09:47 UTC (RELENG_6, 6.4-PRERELEASE)
2008-09-03 19:09:47 UTC (RELENG_6_3, 6.3-RELEASE-p4)

Patch:
http://security.FreeBSD.org/patches/SA-08:09/icmp6.patch

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Tom Parker and Bjoern A. Zeeb.

ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-08:09.icmp6.asc

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About:
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