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Cisco Security Advisory: Cisco Unity Express Expired
Password Reset
Privilege Escalation
Advisory ID: cisco-sa-20060501-cue
http://www.cisco.com/warp/public/707/cisco-sa-20
060501-cue.shtml
Revision 1.0
For Public Release 2006 May 01 2300 UTC (GMT)
+-----------------------------------------------------------
---------
Contents
========
Summary
Affected Products
Details
Impact
Software Version and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of this Notice: FINAL
Distribution
Revision History
Cisco Security Procedures
+-----------------------------------------------------------
---------
Summary
=======
Cisco Unity Express (CUE) contains a vulnerability that
might allow
an authenticated user to change the password for another
user by
using the HTTP management interface, if the password for the
user
being modified is marked as expired. This can result in a
privilege
escalation attack and complete administrative control of a
CUE
module, if the password being changed belongs to an
administrator.
There are mitigations for this vulnerability.
Cisco has made free software available to address this
vulnerability
for affected customers.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20
060501-cue.shtml
Affected Products
=================
Vulnerable Products
+------------------
Any CUE Advanced Integration Module (AIM) or Network Module
(NM)
running CUE software versions prior to 2.3(1) is affected by
this
vulnerability.
The version of software running on a CUE module can be
determined
using the show software versions command in the CUE command
line
interface or by selecting Help > About in the HTTP
management
interface.
cue-10-0-0-1# show software versions
Installed Packages:
- Bootloader (Primary) 2.1.2
- Global 2.2.0
- GPL Infrastructure 2.1.2
- Voice Mail 2.1.2
- Bootloader (Secondary) 2.1.2
- Installer 2.1.1
- Core 2.1.2
- Auto Attendant 2.1.2
Installed Languages:
- US English 2.1.0
Installed Languages:
- US English 1.1.1
The CUE version is determined by the Core package.
Products Confirmed Not Vulnerable
+--------------------------------
No other Cisco products, including Cisco Unity, are
currently known
to be affected this vulnerability.
Details
=======
Cisco Unity Express (CUE) is an optional hardware module
designed for
use with Cisco modular routers to provide voice mail and
automated
attendant services. The HTTP management interface of a CUE
module
allows authenticated users to change their password. This
vulnerability allows authenticated users to change the
password for
any user with an expired password. If an administrator's
account has
expired, the administrator's password can be changed
allowing an
unprivileged user to gain complete administrative control of
a CUE
module.
There are three ways for a user to have an expired password.
* Newly created users with blank passwords. CUE treats
blank
passwords as expired. This feature was introduced in CUE
software
version 1.1(1).
* Newly created users with a randomly selected password.
Administrators can elect to have a random password
assigned when
creating new users. CUE treats the random passwords as
expired.
This feature was introduced in CUE software version
1.1(1).
* If the system-wide password expiry feature is enabled,
user
passwords can be configured to expire after a specified
number of
days. Users with expired passwords are required to
change their
password. This feature was introduced in CUE software
version 2.1
(1).
The vulnerability is documented in the following Cisco Bug
ID:
* CSCsd50387 ( registered customers only) Cisco Unity
Express
Expired Password Reset Privilege Escalation
Impact
======
Successful exploitation of the vulnerability may allow an
unprivileged user to gain complete administrative control of
a CUE
module. This may result in the disclosure of sensitive
information
contained in voice mail stored on a CUE module and possible
negative
publicity if automated attendant messages are maliciously
changed.
Software Version and Fixes
==========================
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.
Fixed software can be downloaded at
http://www.cisco.com/cgi-bin/tablebuild.pl/cue-23
1?psrtdcat20e2
+---------------------------------------+
| Affected Releases | First Fixed |
| | Release |
|-----------------------+---------------|
| All CUE releases up | 2.3(1) |
| to 2.2(2) | |
+---------------------------------------+
Workarounds
===========
It is possible to mitigate this vulnerability by restricting
access
to the HTTP management interface to trusted management hosts
with an
access control list (ACL) applied on the router hosting the
CUE
module. This will prevent users from accessing some CUE
functionality
such as setting their display name. Users can continue to
access
their voice mail and perform a limited number of
configuration
changes such as updating their personal identification
number (PIN).
Management functions can be performed using the CUE command
line
interface.
Obtaining Fixed Software
========================
Cisco has made free software available to address this
vulnerability
for affected customers. This advisory will be updated as
fixed
software becomes available. 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/public/sw-license-agreement.html ,
or as
otherwise set forth at Cisco.com Downloads at
http://www.cisc
o.com/public/sw-center /sw-usingswc.shtml.
Do not contact either "psirt cisco.com" or
"security-alertcisco.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 agreement 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 who do not hold
a Cisco
service contract and customers who purchase through
third-party
vendors but are unsuccessful at obtaining fixed software
through
their point of sale should get their 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: taccisco.com
Have your product serial number available and give the URL
of this
notice as evidence of your 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 special
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 reported to Cisco by Xu He and Keith
Vaughan
of the Bank of America Application Assessment Team.
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. CISCO EXPECTS TO UPDATE THIS DOCUMENT
AS NEW
INFORMATION BECOMES AVAILABLE.
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://www.cisco.com/warp/public/707/cisco-sa-20
060501-cue.shtml
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-announcecisco.com
* first-teamsfirst.org
* bugtraqsecurityfocus.com
* vulnwatchvulnwatch.org
* ciscospot.colorado.edu
* cisco-nsppuck.nether.net
* full-disclosurelists.grok.org.uk
* comp.dcom.sys.cisconewsgate.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 | | Initial |
| 1.0 | 2006-May-01 | 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/en/US/produ
cts/products_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/g
o/psirt.
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