bugtraq - Re: Linux zero IP ID vulnerability?

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Date: Wed, 15 Mar 2006 10:26:00 +0100 (CET)
From: Marco Ivaldi <raptor@...eadbeef.info>
To: bugtraq@...urityfocus.com
Cc: Martin Maèok <martin.macok@...erground.cz>,
	Cody Tubbs <tubbs@...pdirect.com>
Subject: Re: Linux zero IP ID vulnerability?

I've received a couple of off-list replies. See my comments in-line.

On Tue, 14 Mar 2006, Martin MaÄok wrote:

> Have you verified that the sequence is global and not only per peer? The 
> latter would mean that "vuln" can't be used as a middle-man for IDLE 
> scanning...

Yeah, of course i've verified that (see below).

On Tue, 14 Mar 2006, Cody Tubbs wrote:

> Unless you're using the syn/ack flags to localhost, other hosts should 
> not be replying (I can't seem to reproduce this on any of the hosts I've 
> tried, accept ofcourse on localhost).  What is a host(s) you've 
> successfully tried this towards that's not localhost?  Thanks.

Not sure i fully understand your comments... Anyway, here's an host 
showing the flawed behaviour (Gentoo Linux 2.6.14-gentoo-r5 + grsec):

root@...dora:~# hping -SA -c 3 research.mediaservice.net -p 80
HPING research.mediaservice.net (eth0 82.56.144.13): SA set, 40 headers + 
0 data bytes
len=46 ip=82.56.144.13 ttl=59 DF id=48842 sport=80 flags=R seq=0 win=0 
rtt=57.4 ms
len=46 ip=82.56.144.13 ttl=59 DF id=48843 sport=80 flags=R seq=1 win=0 
rtt=57.8 ms
len=46 ip=82.56.144.13 ttl=59 DF id=48845 sport=80 flags=R seq=2 win=0 
rtt=57.6 ms

--- research.mediaservice.net hping statistic ---
3 packets tramitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 57.4/57.6/57.8 ms
root@...ron:~# hping -SA -c 3 research.mediaservice.net -p 80
HPING research.mediaservice.net (dc0 82.56.144.13): SA set, 40 headers + 0 
data bytes
len=46 ip=82.56.144.13 ttl=59 DF id=48850 sport=80 flags=R seq=0 win=0 
rtt=53.7 ms
len=46 ip=82.56.144.13 ttl=59 DF id=48851 sport=80 flags=R seq=1 win=0 
rtt=56.3 ms
len=46 ip=82.56.144.13 ttl=59 DF id=48857 sport=80 flags=R seq=2 win=0 
rtt=59.1 ms

--- research.mediaservice.net hping statistic ---
3 packets tramitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 53.7/56.4/59.1 ms

Cheers,

-- 
Marco Ivaldi
Antifork Research, Inc.   http://0xdeadbeef.info/
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