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"OpenBSD 4.5 - IP datagrams Remote Denial of Service"

Author

Exploit author

Rembrandt

Platform

Exploit platform

openbsd

Release date

Exploit published date

2009-04-13

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_   _ _____ _     ___ _____ _   _
                   / / / / ____/ /   /  _/_  __/ / / /
                  / /_/ / __/ / /    / /  / / / /_/ /
                 / __  / /___/ /____/ /  / / / __  /
                /_/ /_/_____/_____/___/ /_/ /_/ /_/
                           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

# milw0rm.com [2009-04-13]
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Release Date Title Type Platform Author
2020-02-26 "OpenSMTPD < 6.6.3p1 - Local Privilege Escalation + Remote Code Execution" remote openbsd "Qualys Corporation"
2019-12-30 "OpenBSD - Dynamic Loader chpass Privilege Escalation (Metasploit)" local openbsd Metasploit
2019-12-16 "OpenBSD 6.x - Dynamic Loader Privilege Escalation" local openbsd "Qualys Corporation"
2018-11-30 "xorg-x11-server < 1.20.3 - 'modulepath' Local Privilege Escalation" local openbsd "Marco Ivaldi"
2018-10-30 "xorg-x11-server 1.20.3 - Privilege Escalation" local openbsd "Marco Ivaldi"
2017-06-28 "OpenBSD - 'at Stack Clash' Local Privilege Escalation" local openbsd "Qualys Corporation"
2017-02-07 "OpenBSD HTTPd < 6.0 - Memory Exhaustion Denial of Service" dos openbsd PierreKimSec
2009-04-14 "OpenBSD 4.5 - IP datagram Null Pointer Deref Denial of Service" dos openbsd nonroot
2009-04-13 "OpenBSD 4.5 - IP datagrams Remote Denial of Service" dos openbsd Rembrandt
2008-07-01 "OpenBSD 4.0 - 'vga' Local Privilege Escalation" local openbsd "lul-disclosure inc."
Release Date Title Type Platform Author
2009-04-30 "Multiple Vendor - PF Null Pointer Dereference" dos bsd Rembrandt
2009-04-13 "OpenBSD 4.5 - IP datagrams Remote Denial of Service" dos openbsd Rembrandt
2009-02-09 "NETGEAR SSL312 Router - Denial of Service" dos hardware Rembrandt
2008-06-18 "Screen 4.0.3 (OpenBSD) - Local Authentication Bypass" local linux Rembrandt 
import requests
response = requests.get('http://127.0.0.1:8181?format=json')

For full documentation follow the link above

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Identify and fingerprint Web Application Firewall (WAF) products protecting a website.

Host WAF detected