RE: Should nmap cause a DoS on cisco routers?

["Dario Ciccarone (dciccaro)" <dciccaro () cisco com>]

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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 () cisco 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 () cisco 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 () securityfocus com 
> [mailto:listbounce () securityfocus com] On Behalf Of Shang Tsung
> Sent: Wednesday, June 30, 2010 7:04 AM
> To: pen-test () securityfocus 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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This list is sponsored by: Information Assurance Certification Review Board

Prove to peers and potential employers without a doubt that you can actually do a proper penetration test. IACRB CPT 
and CEPT certs require a full practical examination in order to become certified.

http://www.iacertification.org
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