full-disclosure - Re: Should nmap cause a DoS on cisco routers?

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Date: Thu, 1 Jul 2010 13:28:49 -0500
From: "Dario Ciccarone (dciccaro)" <dciccaro@...co.com>
To: "Shang Tsung" <stsung@...l.com>, <pen-test@...urityfocus.com>,
	<full-disclosure@...ts.grok.org.uk>
Subject: Re: Should nmap cause a DoS on cisco routers?

 
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Shang:

	(x-posting to full-disclosure as it looks like those guys over
there
are having a bit of a philosophical discussion over this ;))

	Hi there. My name is Dario Ciccarone and I work as an Incident
Manager on the Cisco PSIRT - Product Security Incident Response Team.

	Your post has certainly caught our attention - indeed, if
running an
nmap scan (no matter which specific command-line options were in use)
against a Cisco device makes it crash, we're certainly interested in
knowing more.

	In order to follow-up on this, we would greatly appreciate if
you
could send us:

	* a "show tech" from one or more of the affected devices -
specially
if those are different kind of devices (switches, routers, firewalls,
etc)

	* if you've been able to collect any crashinfo files - those
would
also come handy

	* if you have any console output/syslog messages/traceback
information coming from any of the affected devices

	* the specific nmap version you're using

	If you could send all of that to psirt@...co.com (if possible,
encrypted with the PSIRT GPG public key -
http://www.cisco.com/en/US/products/products_security_vulnerability_po
licy.html#roosfassv) we would look right into it.

	Much appreciated,
	Dario

Dario Ciccarone <dciccaro@...co.com>
Incident Manager - CCIE #10395 
Product Security Incident Response Team (PSIRT)
Cisco Systems, Inc.
PGP Key ID: 0xBA1AE0F0
http://www.cisco.com/go/psirt

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> -----Original Message-----
> From: listbounce@...urityfocus.com 
> [mailto:listbounce@...urityfocus.com] On Behalf Of Shang Tsung
> Sent: Wednesday, June 30, 2010 7:04 AM
> To: pen-test@...urityfocus.com
> Subject: Should nmap cause a DoS on cisco routers?
> 
> Hello,
> 
> Some days ago, I had the task to discover the SNMP version that our
>  servers and networking devices use. So I run nmap using the
> following  command:
> 
> nmap -sU -sV -p 161-162 -iL target_file.txt
> 
> This command was supposed to use UDP to probe ports 161 and 
> 162, which 
> are used for SNMP and SNMP Trap respectively, and return the SNMP 
> version.
> 
> This "innocent" command caused most networking devices to crash and
>  reboot, causing a Denial of Service attack and bringing down the 
> network.
> 
> Now my question is.. Should this had happened? Can nmap bring 
> the whole 
> network down from one single machine?
> 
> Is this a configuration error of the networking devices?
> 
> This is scary...
> 
> Shang Tsung
> 
> 
> 
> 
> 
> 
>   
> 
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