[c-nsp] Cisco Security Advisory:Cisco Security Agent Vulnerable to Crafted IP attack

Wed Jul 13 12:11:30 EDT 2005

Cisco Security Agent (CSA) is a network security software agent that provides
threat protection for server and desktop computing systems.

A malicious attacker may be able to send a crafted IP packet to a Windows
workstation or server running CSA 4.5 which may cause the device to halt and/or
reload.

Repeated exploitation will create a sustained DoS (denial of service).

Cisco has made free software available to address this vulnerability.

This vulnerability is documented in the Cisco Bug Toolkit as Bug ID CSCsa85175

This advisory is available at 
http://www.cisco.com/warp/public/707/cisco-sa-20050713-csa.shtml

Affected Products
=================

Vulnerable Products
+------------------

Cisco CSA version 4.5 when running on any Microsoft Windows platforms except
Windows XP.

Products Confirmed Not Vulnerable
+--------------------------------

The following products are confirmed not vulnerable:

  * Cisco CSA 4.0 and earlier
  * Cisco CSA while running on Solaris
  * Cisco CSA while running on Linux
  * Cisco CSA while running on Windows XP

No other Cisco products are currently known to be affected by vulnerability.

Details
=======

If a crafted IP packet with certain characteristics are sent to a Windows
platform running CSA 4.5, Windows will halt with a blue screen and system
crash.

When exploited, the affected machine will require a reboot to become
operational again.

This vulnerability is documented in the Cisco Bug Toolkit as Bug ID CSCsa85175 

Impact
======

Successful exploitation of this vulnerability will cause a reload of the
affected machine.

Software Versions and Fixes
===========================

This issue is fixed in CSA maintenance version 4.5.1.616 which is available for
download at http://www.cisco.com/cgi-bin/tablebuild.pl/csa.

This issue is also fixed with CSA hotfix version 4.5.0.573 or later which is
available for download at 
http://www.cisco.com/cgi-bin/tablebuild.pl/csahf-crypto

A maintenance release is a scheduled revision of Cisco CSA that introduces new
features or bug fixes, or both.

A hotfix is Cisco CSA update that delivers fixes on an accelerated schedule
that introduce new bug fixes.

Obtaining Fixed Software
========================

Customers with Service Contracts
+-------------------------------

Customers with contracts should obtain upgraded software through their regular
update channels. For most customers, this means that upgrades should be
obtained through the Software Center on Cisco's worldwide website at 
http://www.cisco.com.

Customers using Third-party Support Organizations
+------------------------------------------------

Customers whose Cisco products are provided or maintained through prior or
existing agreement with third-party support organizations such as Cisco
Partners, authorized resellers, or service providers should contact that
support organization for assistance with the upgrade, which should be free of
charge.

Customers without Service Contracts
+----------------------------------

Customers who purchase direct from Cisco but who do not hold a Cisco service
contract and customers who purchase through third-party vendors but are
unsuccessful at obtaining fixed software through their point of sale should get
their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC
contacts are as follows.

  * +1 800 553 2447 (toll free from within North America)
  * +1 408 526 7209 (toll call from anywhere in the world)
  * e-mail: tac at cisco.com

Please have your product serial number available and give the URL of this
notice as evidence of your entitlement to a free upgrade. Free upgrades for
non-contract customers must be requested through the TAC.

Please do not contact either "psirt at cisco.com" or "security-alert at cisco.com"
for software upgrades.

See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional
TAC contact information, including special localized telephone numbers and
instructions and e-mail addresses for use in various languages.

Customers may only install and expect support for the feature sets they have
purchased. By installing, downloading, accessing or otherwise using such
software upgrades, customers agree to be bound by the terms of Cisco's software
license terms found at http://www.cisco.com/public/sw-license-agreement.html,
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Workarounds
===========

There are no recommended workarounds for this vulnerability. Please see the 
Obtaining Fixed Software section for appropriate solutions to resolve this
vulnerability.

Exploitation and Public Announcements
=====================================

The Cisco PSIRT is not aware of any public announcements or malicious use of
the vulnerability described in this advisory.

Cisco would like to thank Ben Collins at InfoSec Research Labs for bringing
this to our attention.

Status of This Notice: FINAL
============================

THIS ADVISORY IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF
THE INFORMATION ON THE ADVISORY OR MATERIALS LINKED FROM THE ADVISORY IS AT
YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS NOTICE AT ANY
TIME.

A stand-alone copy or paraphrase of the text of this security advisory that
omits the distribution URL in the following section is an uncontrolled copy,
and may lack important information or contain factual errors.

Distribution
============

This advisory will be posted on Cisco's worldwide website at
http://www.cisco.com/warp/public/707/cisco-sa-20050713-csa.shtml.

In addition to worldwide web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail
and Usenet news recipients.

  * cust-security-announce at cisco.com
  * first-teams at first.org (includes CERT/CC)
  * bugtraq at securityfocus.com
  * cisco at spot.colorado.edu
  * cisco-nsp at puck.nether.net
  * full-disclosure at lists.grok.org.uk
  * comp.dcom.sys.cisco at newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide
website, but may or may not be actively announced on mailing lists or
newsgroups. Users concerned about this problem are encouraged to check the
above URL for any updates.

Revision History
================

+---------------------------------------------+
| Revision  | 2005-July-13 | Initial public   |
| 1.0       |              | release.         |
+---------------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco products,
obtaining assistance with security incidents, and registering to receive
security information from Cisco, is available on Cisco's worldwide website at 
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
This includes instructions for press inquiries regarding Cisco security
notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.

==============================================================================

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