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Cisco Security Advisory: Cisco Unified Communications Disaster Recovery Framework Command Execution Vulnerability
From: Cisco Systems Product Security Incident Response Team <psirt () cisco com>
Date: Thu, 03 Apr 2008 16:00:00 -0000

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Cisco Security Advisory: Cisco Unified Communications Disaster
Recovery Framework Command Execution Vulnerability

Advisory ID: cisco-sa-20080403-drf

http://www.cisco.com/warp/public/707/cisco-sa-20080403-drf.shtml

Revision 1.0

For Public Release 2008 April 03 1600 UTC (GMT)

- ---------------------------------------------------------------------

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://www.cisco.com/warp/public/707/cisco-sa-20080403-drf.shtml

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:

  * CSCso53771 - Cisco Unified Communications Manager 5.x and 6.x

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

CVSS Base Score - 10
  Access Vector:          Network
  Access Complexity:      Low
  Authentication:         None
  Confidentiality Impact: Complete
  Integrity Impact:       Complete
  Availability Impact:    Complete
CVSS Temporal Score - 8.3
  Exploitability:         Functional
  Remediation Level:      Official-Fix
  Report Confidence:      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/cgi-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://www.cisco.com/warp/public/707/cisco-amb-20080403-drf.shtml

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/products/prod_warranties_item09186a008088e31f.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://www.cisco.com/warp/public/707/cisco-sa-20080403-drf.shtml

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 |               | Initial    |
| 1.0      | 2008-April-03 | 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/en/US/products/products_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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