Cisco Security Advisory

Cisco CSS 11000 Series Content Services Switches Malformed UDP Packet Vulnerability

Advisory ID: cisco-sa-20040304-css

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040304-css

Revision 1.1

For Public Release 2004 March 4 17:00  UTC (GMT)


Summary

The CSS 11000 Series Content Services Switches are vulnerable to a Denial of Service (DoS) attack caused by malformed UDP packets received over the management port.

This vulnerability is documented as Cisco bug ID CSCed45747. There is no workaround available to mitigate the effects of this vulnerability. Cisco is providing fixed software, and customers are recommended to upgrade to it.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040304-css.

Affected Products

Vulnerable Products

The CSS 11000 Series Content Services Switches (formerly known as Arrowpoint) consist of the CSS 11050, CSS 11100, CSS 11150, and CSS 11800 hardware platforms. They run the Cisco WebNS software.

To determine your hardware model and software revision, type show chassis at the command line prompt.

WebNS Release Train

Affected Releases

5.0(x)

earlier than 05.0(04.07)S

6.10(x)

earlier than 06.10(02.05)S

Products Confirmed Not Vulnerable

For clarification, the CSS 11500 Series Content Services Switches consisting of 11501, 11503, and 11506 , the Cisco Global Site Selector (GSS) series switches, and the Content Switching Module (CSM) are not affected by this vulnerability.

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

Details

If malformed UDP packets are sent to UDP port 5002, the default port for app-udp, on the management port of the CSS 11000 Series Content Services Switch running Cisco WebNS release 5.0(x) and 6.10(x) release trains the switch may reload. This vulnerability exists even when the Network Proximity feature is not configured on the CSS 11000 Series Content Services Switch. Please refer to http://www.cisco.com/univercd/cc/td/doc/product/webscale/css/css_610/advcggd/proximty.htm for more details on the Network Proximity feature.

Access to the management port of the CSS 11000 Series Content Services Switches is available solely through the physical management interface on the device; access via circuit VLANs is not implemented, and therefore the vulnerability can only be exploited through the management port.

This vulnerability is documented in the Cisco Bug Toolkit ( registered customers only) as Bug ID CSCed45747. Cisco WebNS release 7.10(x), 7.20(x), and 7.30(x) release trains have also had code changes but due to architectural differences they are not affected by this vulnerability.

The Internetworking Terms and Cisco Systems Acronyms online guides can be found at http://www.cisco.com/univercd/cc/td/doc/cisintwk/.

Vulnerability Scoring Details

Cisco did not provide scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS) at time of publication.

Impact

Exploitation of this vulnerability results in a reload of the CSS 11000 Series Content Services Switches. Repeated exploitation of the vulnerability may result in a Denial of Service (DoS) for the CSS 11000 Series Content Services Switches.

Software Versions and Fixes

WebNS Release Train

Fixed Releases

5.0(x)

05.0(04.07)S and later

6.10(x)

06.10(02.05)S and later

The procedure to upgrade to a fixed software version is available under "Upgrading Your CSS Software" in the CSS Administration Guide (for version 6.x), or "Upgrading Your CSS Software" in the CSS Basic Configuration Guide (for version 5.x). The steps can be accessed online at http://www.cisco.com/univercd/cc/td/doc/product/webscale/css/css_610/admgd/upgrade.htm.


Workarounds

There is no workaround for this vulnerability. Customers may be able to mitigate the affects of the vulnerability by controlling access to the UDP port 5002 on the management port of the CSS 11000 Series Content Services Switch to allow access only from required network devices or by disallowing access if the Network Proximity feature is not configured.

The Cisco PSIRT recommends that affected users upgrade to a fixed software version of code.

Obtaining Fixed Software

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 http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades

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 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 Without Service Contracts

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: tac@cisco.com

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.

Exploitation and Public Announcements

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

This vulnerability was reported to Cisco PSIRT by Timothy Arnold.

Status of This Notice: Final

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.


Distribution

This advisory is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20040304-css

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@cisco.com
  • first-teams@first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@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 1.2

2005 February 2

Fixed broken link to the upgrade procedure document in the Software Versions and Fixes section.

Revision 1.1

2004 March 04

Added CSS 11100 to the affected products section.

Revision 1

2004 March 04

Initial 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/web/about/security/psirt/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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