Guest

Product Support

Cisco Unity Integrated with Exchange Has Default Passwords

Advisory ID: cisco-sa-20041215-unity

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20041215-unity

Revision 1.0

For Public Release 2004 December 15 16:00  UTC (GMT)


Summary

Several default username/password combinations are present in all available releases of Cisco Unity when integrated with Microsoft Exchange. The accounts include a priviledged administrative account, as well as several messaging accounts used for integration with other systems. An unauthorized user may be able to use these default accounts to read incoming and outgoing messages, and perform administrative functions on the Unity system.

This vulnerability is documented in the Cisco Bug Toolkit as Bug ID CSCeg08552 ( registered customers only)

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20041215-unity.

Affected Products

Vulnerable Products

Cisco Unity versions 2.x, 3.x, and 4.x when integrated with Microsoft Exchange.

Products Confirmed Not Vulnerable

The following products are confirmed not vulnerable:

  • Any version of Cisco Unity when integrated with Lotus Notes
  • Cisco Unity Express
  • Cisco CallManager and CallManager Express
  • Cisco MeetingPlace

No other Cisco products are currently known to create these specific default account/passwords.

Details

Cisco Unity is a communications solution which delivers unified messaging (e-mail, voice, and fax messages sent to one inbox) and intelligent voice messaging. Cisco Unity integrates with desktop applications such as Microsoft Outlook and Lotus Notes.

Several default username/password combinations are present in all releases Cisco Unity when integrated with Microsoft Exchange.

An unauthorized user may be able to use these default accounts to read incoming and outgoing messages, or to perform administrative functions on the Unity system.

The specified accounts with default passwords are:

  • EAdmin<systemid>
  • UNITY_<servername>
  • UAMIS_<servername>
  • UOMNI_<servername>
  • UVPIM_<servername>
  • ESubscriber
  • This vulnerability is documented in the Cisco Bug Toolkit as Bug ID CSCeg08552 ( registered customers only)

    Vulnerability Scoring Details

    Cisco did not provide scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS) at time of publication.

    Impact

    An unauthorized user may utilize EAdmin<systemid> to access the Cisco Unity Administrator in order to create, edit, or delete classes of service, restriction tables, call routing tables, call handlers, schedules and holidays, subscribers, public distribution lists, or to perform other administrative functions.

    An unauthorized user may utilize UNITY_<servername>, UAMIS_<servername>, UOMNI_<servername>, or UVPIM_<servername> to read incoming and outgoing messages as they are passed to and from external voicemail systems. Please note that local messages which do not pass to non-Unity voicemail systems are not made visible by this vulnerability.

    ESubscriber is an example user account that conveys no administrative or other special abilities. However it is contrary to best security practices to have unused accounts with default passwords.

    Software Versions and Fixes

    Cisco Unity 4.0(5), which is scheduled for released in the first quarter of the calendar year 2005, will contain the fix for this issue for NEW INSTALLS ONLY.

    Note: An upgrade to Cisco Unity 4.0(5) from any previous version will still contain this vulnerability. Customers upgrading to version 4.0(5) from any previous version must apply the workaround listed below to eliminate the vulnerability.

    Workarounds

    It is recommended to change to a strong password for all accounts created by Cisco Unity.

    The accounts that are created automatically when Cisco Unity is integrated with Microsoft Exchange are: (replacing <servername> with that of the particular Unity server, and <systemid> with that of your particular system id)

  • EAdmin<systemid>
  • Unity_<servername>
  • UAMIS_<servername>
  • UOMNI_<servername>
  • UVPIM_<servername>
  • Esubscriber
  • Note: Please note that the account ESubscriber is only created during installation of versions PRIOR to version 4.0(3). If your initial installation of Unity was 4.0(3) or later, Esubscriber will not be present.

    See http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2237/products_tech_note09186a0080093f54.shtml for additional information on how to change account passwords.

    For guidance on strong passwords, please refer to your security policy.

    The CERT Coordination Center also has suggestions on strong password policy at http://www.cert.org/tech_tips/unix_configuration_guidelines.html#A leavingcisco.com

    Optionally, a customer may disable (but not delete), these specific accounts for extra security. Beginning with version 4.0(5) of Cisco Unity, these specific accounts will be created in a disabled state. For additional instructions on how to disable these accounts, please see http://www.microsoft.com/windows2000/en/advanced/help/default.asp?url=/windows2000/en/advanced/help/dsadmin_disable_andenable_accounts.htm leavingcisco.com

    With the exception of Esubscriber, it is important to NOT delete any of the accounts listed above. Deletion of EAdmin<systemid>, Unity_<servername>, UAMIS_<servername>, UOMIN_<server>, or UPVIM_<servername> will have an adverse affect on Cisco Unity operation.

    No interruption of service, nor restart of Cisco Unity is required to apply this workarouund.

    Obtaining Fixed Software

    Cisco has released free software updates that address these vulnerabilities. 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/en/US/support/tsd_cisco_worldwide_contacts.html 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 public announcements or malicious use of the vulnerability described in this advisory.

    This vulnerability was discovered during internal Cisco security review.

    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-20041215-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-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

    2004-December-17

    Minor typographical corrections.

    Revision 1.0

    2004-December-15

    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.