Cisco Security Advisory
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AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C
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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 software updates that address this vulnerability.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080403-drf.
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Vulnerable Products
The following Cisco products are known to be vulnerable:
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Cisco Unified Communications Manager (CUCM) 5.x and 6.x
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Cisco Unified Communications Manager Business Edition
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Cisco Unified Precense 1.x and 6.x
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Cisco Emergency Responder 2.x
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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.
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Cisco Unified Communications Manager (CUCM) 5.x and 6.x
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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:
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Modifying or deleting a scheduled backup
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Copying a system backup to a remote, user-specified server
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Restoring a user-specified configuration from a remote server
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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:
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CSCso53771
(
registered customers only)
—Cisco Unified Communications Manager 5.x
and 6.x
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Modifying or deleting a scheduled backup
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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:
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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.
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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.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Revision 1.1
2008-april-25
Updated CVSS link for CSCso53771.
Revision 1.0
2008-April-03
Initial public release
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