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Re: Cisco CSS 11000 Series DoS
From: Mike Caudill <mcaudill () cisco com>
Date: Fri, 8 Aug 2003 13:51:40 -0400 (EDT)

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This is to acknowledge your postings regarding a Denial of Service 
vulnerability in the Cisco CSS 11000 platforms located at:

Vulnwatch list:
http://lists.insecure.org/lists/vulnwatch/2003/Jul-Sep/0073.html

BUGTRAQ:
http://www.securityfocus.com/archive/1/332284/2003-08-05/2003-08-11/0

The Cisco PSIRT is investigating the issue further.  Once we have verified 
details surrounding this problem, we will post a response to both forums 
with more information regarding fixed software versions and applicable 
workarounds which can be used to mitigate the problem.

Thanks.

- -Mike-


###############################################################
ID: S21SEC-025-en
Title: Cisco CSS 11000 Series DoS
Date: 04/07/2003
Status: Solution available
Scope: Interruption of service, high CPU load.
Platforms: All/Chassis CS800.
Author: ecruz, egarcia, jandre
Location: http://www.s21sec.com/en/avisos/s21sec-025-en.txt
Release: External
###############################################################

                              S 2 1 S E C

                         http://www.s21sec.com

                   Cisco CSS 11000 Series Denial of service

Description of vulnerability
----------------------------

A heavy storm of TCP SYN packets directed to the circuit address of the 
CSS 
can cause DoS on it, high cpu load or even sudden reboots.

The issue is known by cisco as the ONDM Ping failure (CSCdz00787). On the 
CS800 chassis the
system controller module (SCM) sends ONDM (online diagnostics monitor) 
pings to each SFP card
in order to see if they are alive, if the SCM doesn't get a response in 
about 30 seconds the
SCM will reboot the CS800 and there will be no core.

By attacking the circuit IP address of the CSS with SYN packets the 
traffic is sent up to the SCM
over the internal MADLAN ethernet interface. If this internal interface 
becomes overloaded
the ONDM ping request and response traffic can be dropped leading this to 
an internal DoS
since no internal comunications are available.

Any attacker could do this externally with a few sessions of NMAP and a 
cable/ADSL internet
connection.

Affected Versions and platforms
-------------------------------

This vulnerability affects the models 11800, 11150 and 11050 with chassis 
CS800.

Solution
--------

Upgrade to software release WebNS 5.00.110s or above.
http://www.cisco.com/en/US/products/hw/contnetw/ps789/prod_release_note0918
6a008014ee04.html

AcL's to protect the circuit address are recomended.

Additional information
----------------------

These vulnerabilities have been found and researched by:

 Eduardo Cruz            ecruz () s21sec com
 Emilin Garcia                 egarcia () s21sec com
 Jordi Andre            jandre () s21sec com

You can find the last version of this warning in:

        http://www.s21sec.com/en/avisos/s21sec-025-en.txt

And other S21SEC warnings in http://www.s21sec.com/en/avisos/

- -- 
- ----------------------------------------------------------------------------
|      ||        ||       | Mike Caudill              | mcaudill () cisco com |
|      ||        ||       | PSIRT Incident Manager    | 919.392.2855       |
|     ||||      ||||      | DSS PGP: 0xEBBD5271       | 919.522.4931 (cell)|
| ..:||||||:..:||||||:..  | RSA PGP: 0xF482F607       ---------------------|
| C i s c o S y s t e m s | http://www.cisco.com/go/psirt                  |
- ----------------------------------------------------------------------------

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