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Cisco Security Advisory

Authentication Bypass in Cisco Unity

Advisory ID: cisco-sa-20081008-unity

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20081008-unity

Revision 1.0

For Public Release 2008 October 8 16:00  UTC (GMT)


Summary

A vulnerability exists in Cisco Unity that could allow an unauthenticated user to view or modify some of the configuration parameters of the Cisco Unity server. Cisco has released free software updates that address this vulnerability. A workaround that mitigates this vulnerability is available.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20081008-unity.

Affected Products

Cisco Unity is a voice and unified messaging platform. Cisco Unity can be configured to interoperate with Microsoft Exchange or IBM Lotus Domino enabling users to access e-mail, voice, and fax messages from a single inbox.

Vulnerable Products

All Cisco Unity versions, 4.x, 5.x and 7.x, may be affected by this vulnerability.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this vulnerability.

Details

Cisco Unity servers may be affected by an authentication bypass when they are configured for anonymous authentication. Anonymous authentication is used when Cisco Unity servers are authenticated to the subscriber instead of Microsoft Windows (Integrated Windows authentication). By default, Cisco Unity is configured so that the administrator uses the Integrated Windows authentication method for authentication.

Details on authentication mechanisms can be found in the Installation Guide for Cisco Unity in the Authentication Methods Available for the Cisco Unity Administrator section.

This authentication bypass vulnerability allows an unauthenticated user the ability to view or modify some system configuration parameters. No credentials, personally identifiable, or user information can be obtained through exploitation of this vulnerability.

This vulnerability is documented in Cisco Bug ID CSCsr86943 ( registered customers only) and has been assigned Common Vulnerability and Exposures (CVE) ID CVE-2008-3814.

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.

Authentication bypass w/ anonymous auth

Calculate the environmental score of CSCsr86943

CVSS Base Score - 5.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

Partial

Partial

None

CVSS Temporal Score - 4.8

Exploitability

Remediation Level

Report Confidence

Functional

Official Fix

Confirmed

Impact

Successful exploitation of the vulnerability may result in an unauthenticated user viewing or altering some configuration parameters of the Cisco Unity server.

Software Versions and Fixes

This vulnerability is fixed in Cisco Unity software version 4.2.1ES161 for the 4.2.1release, 5.0ES53 for the 5.x release, and 7.0ES8 for the 7.x release.

The latest versions of Cisco Unity software can be downloaded from http://tools.cisco.com/support/downloads/go/Redirect.x?mdfid=274246502. Software for each releases is available at: 4.2(1) ES release, 5.0(1) ES release, 7.0(2) ES release.

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.


Workarounds

Integrated Windows authentication is not affected by this vulnerability and may be used as an alternative to Anonymous Authentication.

Details on authentication mechanisms and how to configure them can be found in the Installation Guide for Cisco Unity in the Setting Up Authentication for the Cisco Unity Administrator section.

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

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-20081008-unity

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

2008-Oct-8

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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