Advisory ID: cisco-sa-20041215-unity
For Public Release 2004 December 15 16:00 UTC (GMT)
Vulnerability Scoring Details
Software Versions and Fixes
Obtaining Fixed Software
Exploitation and Public Announcements
Status of This Notice: Final
Cisco Security Procedures
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.http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20041215-unity.
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.
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:
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.
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.
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)
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
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
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.
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 email@example.com or firstname.lastname@example.org for software upgrades
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 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)
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.
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.
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