|
Brought to you by:
Suppliers of:
|
|
|
| |
| 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. |
| |
Credit:
The information has been provided by Cisco Systems Product Security Incident Response Team.
The original article can be found at: http://www.cisco.com/warp/public/707/cisco-sa-20041215-unity.shtml
|
| |
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>
* ESubsubscriber
This vulnerability is documented in the Cisco Bug Toolkit as Bug ID CSCeg08552 ( registered customers only)
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. Customer 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
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 workaround.
|
|
|
|
|
