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Cisco Security Advisory

Cisco Unified Presence Denial of Service Vulnerabilities

Advisory ID: cisco-sa-20091014-cup

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20091014-cup

Revision 1.0

For Public Release 2009 October 14 16:00  UTC (GMT)


Summary

Cisco Unified Presence contains two denial of service (DoS) vulnerabilities that may cause an interruption to presence services. These vulnerabilities were discovered internally by Cisco, and there are no workarounds.

Cisco has released free software updates that address these vulnerabilities.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20091014-cup.

Affected Products

Vulnerable Products

The following products are affected:

  • Cisco Unified Presence 1.x versions
  • Cisco Unified Presence 6.x versions prior to 6.0(6)
  • Cisco Unified Presence 7.x versions prior to 7.0(4)

Administrators of systems running Cisco Unified Presence can determine the software version by viewing the main page of the Cisco Unified Presence Administration interface. The software version can be determined by running the command show version active via the Command Line Interface (CLI).

Products Confirmed Not Vulnerable

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

Details

Network Flooding Vulnerability

Cisco Unified Presence contains a denial of service (DoS) vulnerability that may cause the TimesTenD process to fail when TCP ports 16200 or 22794 are flooded with connections. TCP 3-way handshakes must be completed for the attack to be successful. The TimesTenD process will be automatically restarted upon failure. This vulnerability is documented in Cisco Bug ID CSCsy17662 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2009-2874.

Network Connection Tracking Vulnerability

Cisco Unified Presence contains a DoS vulnerability that involves the tracking of network connections by the embedded firewall. An attacker can overwhelm the table that is used to track network connections and prevent new connections from being established to system services by establishing many TCP connections with a vulnerable system. Any service that listens to a TCP port on a vulnerable system could be affected by this vulnerability. This vulnerability is documented in Cisco Bug ID CSCsw52371 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2009-2052.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html.

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss.

CSCsy17662 - TimesTenD Coredump During TCP Flood ( registered customers only)

Calculate the environmental score of CSCsy17662

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCsw52371 - CUP: IP_Conntrack Fills Up During TCP Flood Attack ( registered customers only)

Calculate the environmental score of CSCsw52371

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of any of the vulnerabilities may result in the interruption of presence services.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

Cisco Unified Presence version 6.0(6) is available at the following link:

http://tools.cisco.com/support/downloads/go/ReleaseType.x?optPlat=&isPlatform=Y&mdfid=281010019&sftType=Unified+Presence+Server+%28CUPS%29+Updates&treeName=Voice+and+Unified+Communications&modelName=Cisco+Unified+Presence+Version+6.0&mdfLevel=null&treeMdfId=278875240&modifmdfid=null&imname=&hybrid=Y&imst=N ( registered customers only)

Cisco Unified Presence version 7.0(5) is available at the following link:

http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Unified+Presence+Server+%28CUPS%29+Updates&mdfid=281820245&treeName=Voice+and+Unified+Communications&mdfLevel=Software%20Version/Option&url=null&modelName=Cisco+Unified+Presence+Version+7.0&isPlatform=N&treeMdfId=278875240&modifmdfid=null&imname=&hybrid=Y&imst=N ( registered customers only)

Note: Administrators running Cisco Unified Presence version 1.x are encouraged to upgrade to version 6.0 or later.


Workarounds

No workarounds are available; however, mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory, which is available at the following link:

http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20091014-cup

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. These vulnerabilities were discovered by Cisco.

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-20091014-cup

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-bulletins@lists.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 1.0

2009-October-14

Initial public 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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