BugTraq
Windows Server 2003 and XP SP2 LAND attack vulnerability Mar 05 2005 06:17PM
Dejan Levaja (dejan levaja com) (1 replies)
Re: Windows Server 2003 and XP SP2 LAND attack vulnerability Mar 07 2005 09:55PM
Jon O. (jono networkcommand com) (4 replies)
Re: Windows Server 2003 and XP SP2 LAND attack vulnerability Mar 11 2005 09:37AM
exon (exon home se)
Re: Windows Server 2003 and XP SP2 LAND attack vulnerability Mar 08 2005 01:05PM
killer_loop (at) mail (dot) com [email concealed] (lammat grpower ath cx)
Re: Windows Server 2003 and XP SP2 LAND attack vulnerability Mar 08 2005 11:01AM
Miroslav Kubik (kubik_miroslav seznam cz)
Re: Windows Server 2003 and XP SP2 LAND attack vulnerability Mar 08 2005 05:42AM
Patrick Chipman (pchipman memphis edu)
I can replicate this using hping2 on a Linux 2.2.19 box targeting a Windows
XP SP2 box (fully patched) with no firewall active on the same subnet. The
packet sent has the SYN flag set (-S) and a spoofed source address (-a). The
source and destination ports must be the same and open on the target
machine. I tried ports 135, 139, 445, and 3389, and all of them raised the
CPU usage of the System process to 100% for the duration of the attack and
for about 10 seconds afterwards. The effect is quite dramatic, but the
system isn't frozen per se. You can still interact with it, albeit very
slowly. Task Manager responds updates its window appropriately, for
instance, and you can send events to other applications.

One version of the command I used was (from a machine at 192.168.1.5):

hping2 192.168.1.1 -s 135 -p 135 -S -a 192.168.1.1

That should have the desired effect.

--
Patrick Chipman
Institute for Intelligent Systems
http://www.iismemphis.org
----- Original Message -----
From: "Jon O." <jono (at) networkcommand (dot) com [email concealed]>
To: "Dejan Levaja" <dejan (at) levaja (dot) com [email concealed]>
Cc: <bugtraq (at) securityfocus (dot) com [email concealed]>
Sent: Monday, March 07, 2005 3:55 PM
Subject: Re: Windows Server 2003 and XP SP2 LAND attack vulnerability

> All:
>
> I would like to hear from someone who can reproduce this. If you can,
> please send
> details with OS, patches installed, pcaps, etc. not a report of what tools
> you used
> to create the packet, sniff and replay the results. I've tested this and
> either my
> machines are magically protected from this attack, or it is invalid
> (despite what
> the press might say). I'd like some outside corroboration of this attack.
>
>
> On 05-Mar-2005, Dejan Levaja wrote:
>>
>>
>> Hello, everyone.
>>
>> Windows Server 2003 and XP SP2 (with Windows Firewall turned off) are
>> vulnerable to LAND attack.
>>
>> LAND attack:
>> Sending TCP packet with SYN flag set, source and destination IP address
>> and source and destination port as of destination machine, results in
>> 15-30 seconds DoS condition.
>>
>>
>> Tools used:
>> IP Sorcery for creating malicious packet, Ethereal for sniffing it and
>> tcpreplay for replaying.
>>
>> Results:
>> Sending single LAND packet to file server causes Windows explorer
>> freezing on all workstations currently connected to the server. CPU on
>> server goes 100%. Network monitor on the victim server sometimes can not
>> even sniff malicious packet. Using tcpreplay to script this attack
>> results in total collapse of the network.
>>
>> Vulnerable operating systems:
>> Windows 2003
>> XP SP2
>> other OS not tested (I have other things to do currently ? like checking
>> firewalls on my networks ;) )
>>
>> Solution:
>> Use Windows Firewall on workstations, use some firewall capable of
>> detecting LAND attacks in front of your servers.
>>
>> Ethic:
>> Microsoft was informed 7 days ago (25.02.2005, GMT +1, local time), NO
>> answer received, so I decided to share this info with security community.
>>
>>
>> Dejan Levaja
>> System Engineer
>> Bulevar JNA 251
>> 11000 Belgrade
>> Serbia and Montenegro
>> cell: +381.64.36.00.468
>> email: dejan (at) levaja (dot) com [email concealed]
>>
>

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