Technical Description

A vulnerability has been identified in FreeBSD, which could be exploited by remote attackers to cause a denial of service. This issue is caused by an error in the "icmp6_mtudisc_update()" [sys/netinet6/icmp6.c] function when processing specially crafted ICMPv6 "Packet Too Big" messages, which could allow remote attackers to cause the TCP stack of the kernel to panic, creating a denial of service condition.

Affected Products

FreeBSD version 7.x
FreeBSD version 6.x

Solution

Apply patch :
# fetch http://security.FreeBSD.org/patches/SA-08:09/icmp6.patch
# fetch http://security.FreeBSD.org/patches/SA-08:09/icmp6.patch.asc

References

http://www.vupen.com/english/advisories/2008/2500
http://security.freebsd.org/advisories/FreeBSD-SA-08:09.icmp6.asc

Credits

Vulnerability reported by Tom Parker and Bjoern A. Zeeb.

ChangeLog

2008-09-05 : Initial release

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