Cisco Security Advisory
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AV:N/AC:M/Au:N/C:P/I:P/A:N/E:F/RL:OF/RC:C
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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 software updates that address this vulnerabilities. A workaround that mitigates this vulnerability is available.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20081008-unity.
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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.
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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.
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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.
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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 https://sec.cloudapps.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.
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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 1.0
2008-Oct-8
Initial public release
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