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Cisco Security Advisory

Cisco Unified Communications Manager Multiple Denial of Service Vulnerabilities

Advisory ID: cisco-sa-20130227-cucm

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130227-cucm

Revision 1.0

For Public Release 2013 February 27 16:00  UTC (GMT)


Summary

Cisco Unified Communications Manager contains two vulnerabilities that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. Exploitation of these vulnerabilities could cause an interruption of voice services.

Cisco has released free software updates that address these vulnerabilities. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130227-cucm

Affected Products


Vulnerable Products

The following products are affected by the vulnerabilities that are described in this advisory:
  • Cisco Unified Communications Manager 8.6(x)
  • Cisco Unified Communications Manager 9.0(x)

Note: Cisco Unified Communications Manager version 6.1 reached the End of Software Maintenance on September 3, 2011. Customers using Cisco Unified Communications Manager 6.x versions should contact their Cisco support team for assistance in upgrading to a supported version of Cisco Unified Communications Manager.

Products Confirmed Not Vulnerable

The following products are not affected by the vulnerabilities described in this advisory.
  • Cisco Unified Communications Manager 7.x
  • Cisco Unified Communications Manager 8.5(x)

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

Details

Cisco Unified Communications Manager is the call processing component of the Cisco IP Telephony solution that extends enterprise telephony features and functions to packet telephony network devices, such as IP phones, media processing devices, VoIP gateways, and multimedia applications.

Malformed UDP Packets Denial of Service Vulnerability

Cisco Unified Communications Manager contains a DoS vulnerability that could allow an unauthenticated, remote attacker to cause an exhaustion of resources in the CPU. This vulnerability is triggered by receiving malformed packets on unused UDP ports and could result in an inability to connect to the graphical user interface (GUI) and an interruption of voice services.

This vulnerability is documented in Cisco Bug ID CSCtx43337 (registered customers only) and has been assigned the Common Vulnerabilities Enumerator (CVE) ID CVE-2013-1133. This vulnerability applies to Cisco Unified Communications Manager versions 8.6(x) and above and is fixed in Cisco Unified Communications Manager versions 9.0(1), 8.6(4) BE3k and 8.6(2a)su2. Cisco Unified Communications Manager 7.1(x) and 8.5(x) versions are not affected.

Location Bandwidth Manager (LBM) Cache Poisoning Vulnerability

Cisco Unified Communications Manager 9.0 contains a vulnerability that could allow an unauthenticated, remote attacker to poison the Location Bandwidth Manager (LBM) transaction records.

The vulnerability is due to a lack of authentication of the remote LBM Hub node in the Intracluster communication between LBMs. An attacker could exploit this vulnerability by poisoning the LBM transaction records to consume all available bandwidth pools. An exploit could allow the attacker to consume all bandwidth and deny calls. This vulnerability is documented in Cisco Bug ID CSCub28920 (registered customers only) and has been assigned the CVE ID CVE-2013-1134. This vulnerability applies to Cisco Unified Communications Manager version 9.0(x) only and is fixed in Cisco Unified Communications Manager versions 9.1(1). Cisco Unified Communications Manager 7.1(x), 8.5(x) and 8.6(x) versions are not affected.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

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

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerabilities in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

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

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

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



CSCtx43337 Cisco Unified Communications Manager Memory Leak During UDP Flood against Closed Ports

Calculate the environmental score of CSCtx43337

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






CSCub28920 Cisco Unified Communication Manager Location Bandwidth Manager (LBM) Poisoning Vulnerability

Calculate the environmental score of CSCub28920

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

None

None

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the vulnerabilities that are described in this advisory could allow a remote attacker to trigger a memory leak or a denial of service condition resulting in the interruption of voice 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 recommends upgrading to a release equal to or later than the release in the "Recommended Release" column of the table.

Cisco Unified Communication Manager Version Recommended Release
8.x 8.6(4)BE3K, 8.6(2a)su2

9.x 9.1(1)



In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Workarounds

Filtering traffic on TCP port 9004 from untrusted sources can provide a workaround for the LBM vulnerability.

Additional mitigations that can be deployed on Cisco devices in the network are available in the companion document "Identifying and Mitigating Exploitation of the Cisco Unified Communications Manager and Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability" at the following location: http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=28034

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerability described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers Using Certified Software Versions: Customers that are using software versions that have been through a special certification process need to follow the appropriate procedure to check the certification status before upgrading. Not all software trains are targeted to go through the various certifications.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers Using Third-Party Support Organizations

Customers with Cisco products that 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 organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
  • +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 the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

These vulnerabilities were found during internal testing.

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 Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130227-cucm

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:
  • 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
Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.

Revision History

Revision 1.0 2013-February-27 Initial public release.

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.
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