_ _ _____ _ ___ _____ _ _ / / / / ____/ / / _/_ __/ / / / / /_/ / __/ / / / / / / / /_/ / / __ / /___/ /____/ / / / / __ / /_/ /_/_____/_____/___/ /_/ /_/ /_/ Helith - 0815 --------------------------------------------------------------------------------
Author : Rembrandt Date : 2009-04-09 Affected Software: OpenBSD Kernel Affected OS : OpenBSD 4.{3,4,5}, OpenBSD-current Propably older versions are affected as well Type : Denial of Service
OSVDB : Milw0rm : CVE : ISS X-Force: : BID : Secunia : 34676 VUPEN ID :
Trying to fix it responsible and get in contact with the vendor:
-- OpenBSD -- Contacted 2009-04-09 15:35 GMT+1 Patch avaiable 2009-04-11 23:43 UTC
We received no response nor a notification about an upcoming patch by the developers. -- END --
OpenBSDs PF firewall in OpenBSD 4.3 up to OpenBSD-current is prone to a remote Denial of Service during a null pointer dereference in relation with special crafted IP datagrams. If the firewall handles such a packet the kernel panics.
Steps to reproduce:
If you are behind a OpenBSD firewall this nmap scan should trigger the problem and crash your firewall device:
nmap -sO $some_host_so_that_the_firewall_handles_the_packets
For more informations please do read the patch issued by OpenBSD.
Patches and Workaround:
Patches are provided for OpenBSD 4.3, 4.4, 4.5 (upcoming, release 1st of may) and OpenBSD-current (via CVS only) and are avaiable at the errata website. The developers provide hints for a workaround at their errata website too.
Kind regards, Rembrandt
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