Re: Windows Server 2003 and XP SP2 LAND attack vulnerability
In-Reply-To: <20050307215532.GA24251@xxxxxxxxxxxxxxxxxxxx>
Hello
I've been able to reproduce this.
I used ipmagic on debian 3.0 and sendt a packet to a fully patched Windows 2003
server running on Vmware ESX server. I got a 1-5 sec. 100% load on the CPU on
the target server. 1 packet/pr. sec. was enough to keep the CPU on 100% load.
Espen Grøndahl
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>Date: Mon, 7 Mar 2005 13:55:32 -0800
>From: "Jon O." <jono@xxxxxxxxxxxxxxxxxx>
>To: Dejan Levaja <dejan@xxxxxxxxxx>
>Cc: bugtraq@xxxxxxxxxxxxxxxxx
>Subject: Re: Windows Server 2003 and XP SP2 LAND attack vulnerability
>Message-ID: <20050307215532.GA24251@xxxxxxxxxxxxxxxxxxxx>
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>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@xxxxxxxxxx
>>
>