OpenBSD IPv6 packet denial of service

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

Description:

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.


Consequences:

Denial of Service

Remedy:

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.

References:

Platforms Affected:

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

Reported:

Feb 04, 2004

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