OpenBSD IPv6 remote kernel crash

["Thor Larholm" <vulnwatch.org () jscript dk>]

Georgi Guninski posted an advisory on his site about a remote crash in the
OpenBSD kernel caused by connecting with a small IPv6 MTU.

http://www.guninski.com/obsdmtu.html

The error was present in revision 1.81 of /src/sys/netinet6/ip6_output.c and
is fixed in revision 1.82 ( 2004/02/04 08:47:41 ), you can see the colored
diffs at

http://www.openbsd.org/cgi-bin/cvsweb/src/sys/netinet6/ip6_output.c.diff?r1=text&tr1=1.81&r2=text&tr2=1.82&f=h


OpenBSD administrators should pull the revised code from CVS and recompile
their kernels.




Regards

Thor Larholm
Senior Security Researcher
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