OpenBSD IPv6 packet denial of service

openbsd-ipv6-dos (15044) The risk level is classified as MediumMedium Risk


OpenBSD is vulnerable to a denial of service. A remote attacker could send a specially-crafted IPv6 packet that contains a small MTU (Maximum Transfer Unit) to the vulnerable system and then establish a TCP connection to cause the system to crash.


Denial of Service


Apply the fix for this vulnerability, available from the CVS log for src/sys/netinet6/ip6_output.c Web page. See References.

For NetBSD-current (dated prior to 2004-02-05), 1.5, and 1.6 branch:
Upgrade to the appropriate fixed versions of NetBSD, as listed in NetBSD Security Advisory 2004-002. See References.

For other distributions:
Contact your vendor for upgrade or patch information.


Platforms Affected:

  • NetBSD NetBSD 1.6
  • NetBSD NetBSD 1.6.1
  • OpenBSD OpenBSD 3.4


Feb 04, 2004

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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