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Cisco Security Advisory

Cisco Unified Communications Disaster Recovery Framework Command Execution Vulnerability

Advisory ID: cisco-sa-20080403-drf

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080403-drf

Revision 1.1

For Public Release 2008 April 3 16:00  UTC (GMT)

Related Resources:

View related Applied Mitigation BulletinView related Alert

Summary

Several products in the Cisco Unified Communications family of products contain a command execution vulnerability in the Disaster Recovery Framework (DRF) feature. A remote, unauthenticated user could exploit this vulnerability to execute arbitrary commands that may allow full administrative access to affected systems. There is a workaround for this vulnerability.

Cisco has released free software updates that address this vulnerability.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080403-drf.

Affected Products

Vulnerable Products

The following Cisco products are known to be vulnerable:

  • Cisco Unified Communications Manager (CUCM) 5.x and 6.x
  • Cisco Unified Communications Manager Business Edition
  • Cisco Unified Precense 1.x and 6.x
  • Cisco Emergency Responder 2.x
  • Cisco Mobility Manager 2.x

Products Confirmed Not Vulnerable

Cisco Unified Communications Manager versions 3.x and 4.x are not vulnerable. No other Cisco products are currently known to be affected by these vulnerabilities.

Details

The Disaster Recovery Framework (DRF) is a feature shared among several products in the Cisco Unified Communications family of products. DRF allows administrators to backup and restore a system configuration to a local tape drive or remote server.

The DRF Master server is responsible for performing backup and restoration requests. This vulnerability documents an issue where the DRF Master server does not perform authentication on requests that it receives over the network. A remote, unauthenticated user can connect to the DRF Master server and may be able to perform any DRF-related tasks. These tasks include:

  • Modifying or deleting a scheduled backup
  • Copying a system backup to a remote, user-specified server
  • Restoring a user-specified configuration from a remote server
  • Execute arbitrary operating system commands

An attacker could exploit this vulnerability to cause a denial of service condition, obtain sensitive configuration information, overwrite configuration parameters, or execute arbitrary commands with full administrative privileges.

This vulnerability is documented in CVE-2008-1154 and the following Cisco Bug IDs:

Vulnerability Scoring Details

Cisco has provided scores for the vulnerability 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.

CSCso53771 - Unauthenticated Access to Disaster Recovery Framework ( registered customers only)

Calculate the environmental score of CSCso53771

CVSS Base Score - 10

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Complete

Complete

Complete

CVSS Temporal Score - 8.3

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of this vulnerability could allow a remote, unauthenticated attacker to cause a denial of service condition, obtain sensitive configuration information, overwrite configuration parameters or execute arbitrary commands with full administrative privileges.

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.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Fixed software is available for the following Cisco products. This advisory will be updated as additional fixes are available.

A patch has been provided that can be applied to CUCM 5.x and 6.x, CUCMBE, Cisco Unified Presence 1.x and 6.x, Cisco Emergency Responder 2.x, and Cisco Mobility Manager 2.x. The filename is ciscocm.CSCso53771.security.patch.cop and can be downloaded at the following link:

http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-utilpage?psrtdcat20e2

Please consult the COP file Readme for installation instructions.


Workarounds

Administrators can mitigate this vulnerability by disabling the DRF Master service. However, administrators should exercise caution when disabling the DRF Master service, as system backups will not occur while the service is stopped. Administrators are encouraged to perform a complete system backup before employing this workaround and use care when making configuration changes until the DRF Master service can be safely re-enabled.

Instructions for disabling the DRF Master service on Cisco Unified Communications Manager systems are available at the following link:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/5_0_1/ccmsrva/sasrvact.html#wp1048220

The vulnerability may be mitigated by restricting access to the DRF Master service (TCP port 4040). For a Cisco Unified Communications Manager cluster, access to the port should be restricted to valid cluster nodes.

Additional mitigation techniques that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory:

http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20080403-drf

Obtaining Fixed Software

Cisco has released free software updates that address this vulnerability. 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/warp/public/687/Directory/DirTAC.shtml 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 malicious use of the vulnerability described in this advisory.

This vulnerability was reported to Cisco by VoIPshield Systems.

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-20080403-drf

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 1.1

2008-april-25

Updated CVSS link for CSCso53771.

Revision 1.0

2008-April-03

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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