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RE: SSH CRC-32 Compensation Attack Detector Vulnerability on CISCO routers
From: "Dario Ciccarone" <dciccaro () cisco com>
Date: Mon, 2 Jun 2003 14:23:28 -0300

It's not so easy on IOS . . .


-----Original Message-----
From: Jeremy Junginger [mailto:jj () act com] 
Sent: Monday, June 02, 2003 11:34 AM
To: pen-test
Subject: SSH CRC-32 Compensation Attack Detector 
Vulnerability on CISCO routers

Good Morning, 

In conducting a penetration test on a "secured VLAN" 
implementation that uses 100% OOB management, I have come 
across an exciting find!  There are several terminal servers 
(25xx and 26xx series) that are running a vulnerable version 
of code (12.2) per this list: http://www.securityfocus.com/bid/2347

So, naturally, I wanted to take a look at the "proof of concept code"

I'm sure many of you have run into this situation.  You find a service
or application that is known to be vulnerable, and the client says "show
me the 'sploit.'"  Normally, that's a great chance to show them what
you're capable of.  In this case, I told them it is vulnerable (in
theory) but I have not seen an exploit for it.

My question is, have any of you guys played with this exploit on Cisco
devices?  I know that the shellcode would have to change (obviously from
/bin/sh to some type of router compromising command like 'ip http
server' or 'snmp community h4x0r RW' or something that would give you a
nice level of access to the device).  The really funny thing is that
this exploit has been around so long, and I have yet to hear of someone
smashing a router with it.  

If you have gotten this to work on a Cisco device, let me know.  If not,
I am planning on setting up a target router running only ssh for you
guys to bang on if you want.  I can set up a 25xx, 26xx, or 71xx router
for testing, so shoot me an email if you're interested.




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