Advisory ID: cisco-sa-20050713-csa
For Public Release 2005 July 13 16:00 UTC (GMT)
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 (registered customers only) .
This advisory is posted at
Cisco CSA version 4.5 when running on any Microsoft Windows platforms except Windows XP.
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.
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 ( registered customers only) .
Cisco has not provided scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). At the time of original publication, CVSS scoring in Cisco security publications was not yet adopted
Successful exploitation of this vulnerability will cause a reload of the affected machine.
This issue is fixed in CSA maintenance version 22.214.171.1246 which is available for download at http://www.cisco.com/pcgi-bin/tablebuild.pl/csa.
This issue is also fixed with CSA hotfix version 126.96.36.1993 or later which is available for download at http://www.cisco.com/pcgi-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.
There are no recommended workarounds for this vulnerability. Please see the Obtaining Fixed Software section for appropriate solutions to resolve this vulnerability.
Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.
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
, or as otherwise set forth at Cisco.com Downloads at
Do not contact firstname.lastname@example.org or email@example.com for software upgrades
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
Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.
Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire 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: firstname.lastname@example.org
Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.
Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.
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.
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
This advisory is posted on Cisco's worldwide website at:
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.
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.
Initial public release.