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Georgi Guninski security
advisory #66, 2004
Remote openbsd crash with ip6, yet still openbsd much better than
tested on openbsd 3.4
not clear about netbsd
freebsd not vulnerable
Date: 4 February 2004
This Advisory is Copyright (c) 2004 Georgi Guninski.
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The information in this advisory is believed to be true though
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It is possible to remotely crash openbsd 3.4 if the host receives icmpv6
and there is a listening tcp port.
quoting de raadt: "it is just a crash."
remote crash which screws the kernel.
unknown whether this may be exploited for code execution.
The problem is triggered by setting small ipv6 mtu and then doing tcp
How to reproduce:
Patch linux kernel 2.4.24 net/ipv6/icmp.c :
/* we coulnd't care less */
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, 68, skb->dev); //joro
ssh -6 openbsd
It is believed that openbsd current is not vulnerable.
netbsd current also seems to have related changes.
open, net and free bsd were notified Sun, 1 Feb 2004 16:35:56 +0200