2nd Apr 2002 [SBWID-5219]
COMMAND
memory leak in the CTI Framework authentication leading to DoS.
SYSTEMS AFFECTED
Cisco CallManager 3.1
PROBLEM
In Cisco Security Advisory
[http://www.cisco.com/warp/public/707/callmanager-ctifw-leak-pub.shtml]:
Summary
=======
The Cisco CallManager, running certain software releases, has a
vulnerability wherein a memory leak in the CTI Framework authentication
can cause the server to crash and result in a reload. This
vulnerability can be exploited to initiate a denial of service (DoS)
attack.
This vulnerability is documented as Cisco bug ID CSCdv28302. There are
workarounds available to mitigate the vulnerability.
This advisory is available at
http://www.cisco.com/warp/public/707/callmanager-ctifw-leak-pub.shtml
Affected Products
=================
To determine if a product is vulnerable, review the list below. If the
software versions or configuration information are provided, then only
those combinations are vulnerable.
* Cisco CallManager 3.1
No other Cisco product is known to be affected by this vulnerability.
Details
=======
A memory leak in the Cisco CallManager has been attributed to the
failure of a user to properly authenticate when using Call Telephony
Integration (CTI). This behavior is most commonly seen on CallManager
systems immediately following the integration with a customer directory
such as Active Directory (AD) or Netscape. The most common cause in
this scenario is that the WebAttendant user, CTI Framework (CTIFW), has
not been configured with a valid password in the customer directory.
Please note that this problem will occur even on systems that do not
utilize the WebAttendant since the Telephony Call Dispatch (TCD)
service is always enabled by default. The CCMAdmin->Global Directory
and \"Add a New User\" configuration pages stop working if CTIFW user
is not configured or the CTI user\'s password is incorrect. Various
other components such as RIS Data Collector may also fail to function
properly.
Bug ID
======
This vulnerability is documented as Cisco Bug ID CSCdv28302.
Problem Symptoms
================
There are several indicators available in determining if this problem
is at the root.
LDAP Leak Detection
+-----------------------------------------------------+
| Tool | Message |
|-------+---------------------------------------------|
| |Error: kCtiProviderOpenFailure - CTI |
| |application failed to open provider |
| |CTIconnectionId: 485 |
| |Login User Id: CtiFw |
| |ReasonCode: 2362179680 |
| |IPAddress: 172.21.12.44 |
| |App ID: Cisco CTIManager |
| |Cluster ID: JMTAO-CM2-Cluster |
|Event |Node ID: JMTAO-CM2 |
|Viewer |CTI Application ID: Cisco Telephony Call |
| |Dispatcher |
| |Process ID: 0 |
| |Process Name: CtiHandler |
| |Provider Name: CTI Framework |
| |Explanation: Application is unable to open |
| |provider. |
| |Recommended Action: Check the reason code and|
| |correct the problem. Restart |
| |CTIManager if problem persists.. |
|-------+---------------------------------------------|
| |From the Task Manager select the Processes |
| |tab, click View and then Select Columns... |
|Task |Check Handle Count and click OK. |
|Manager|Click on the Handles column to sort by |
| |handles used. |
| |You will observe that the CTIManager.exe is |
| |consuming a large number of handles (> 500). |
|-------+---------------------------------------------|
| |Another diagnostic tool is to run \"netstat |
| |-na\" from a DOS command prompt on the CM |
|DOS |server. A very large number of established |
|netstat|connections to TCP port 389 if CallManager is|
| |integrated with AD or port 8404 when |
| |CallManager is integrated with DCD. |
+-----------------------------------------------------+
Impact
======
The vulnerabilities can be exploited to produce a Denial of Service
(DoS) attack. When the vulnerabilities are exploited, they can cause an
affected Cisco product to crash and reload.
Software Versions and Fixes
===========================
+-----------------------------------------------------+
|Version |Fixed Regular Release (available now) |
|Affected |Fix carries forward into all later |
| |versions |
|--------------+--------------------------------------|
|Version 3.1 |Upgrade to 3.1(2) |
+-----------------------------------------------------+
Obtaining Fixed Software
========================
Cisco is offering free software upgrades to address this vulnerability
for all affected customers. Customers may only install and expect
support for the feature sets they have purchased.
Customers with service contracts should contact their regular update
channels to obtain any software release containing the feature sets
they have purchased. For most customers with service contracts, this
means that upgrades should be obtained through the Software Center on
Cisco\'s Worldwide Web site at http://www.cisco.com.
Customers whose Cisco products are provided or maintained through a
prior or existing agreement with third-party support organizations such
as Cisco Partners, authorized resellers, or service providers should
contact that support organization for assistance with obtaining the
free software upgrade (s).
Customers who purchased directly 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 obtain fixed software by contacting the Cisco
Technical Assistance Center (TAC) using the contact information listed
below. In these cases, customers are entitled to obtain an upgrade to a
later version of the same release or as indicated by the applicable row
in the Software Versions and Fixes table (noted above).
Cisco 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
See 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.
Please have your product serial number available and give the URL of
this notice as evidence of your entitlement to a free upgrade.
Please do not contact either \"psirt@cisco.com\" or
\"security-alert@cisco.com\" for software upgrades.
SOLUTION
Workarounds
============
Configure the ctifw user by following the instructions at:
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/3_0/install/ad_3011.htm#xtocid30717
+-----------------------------------------------------+
|Step| Action |
|----+------------------------------------------------|
| |Set the password for the user in the corporate |
|1 |directory using your standard user management |
| |tools. |
|----+------------------------------------------------|
| |On a Cisco CallManager server, choose Start > |
|2 |Run and enter command to open a command prompt. |
| |Click OK. |
|----+------------------------------------------------|
|3 |Enter the command, PasswordUtils; for example, |
| |\"passwordUtils my_passphrase\" |
|----+------------------------------------------------|
| |The previous action generates an encrypted |
|4 |password. Copy the password into the Windows |
| |clipboard. |
|----+------------------------------------------------|
|5 |Choose Start > Run. |
|----+------------------------------------------------|
|6 |Enter regedit into the Open field and then click|
| |OK. |
|----+------------------------------------------------|
| |Browse to \\\\HKEY_LOCAL_MACHINE\\Software\\Cisco |
|7 |Systems, Inc.\\Directory Configuration within the|
| |registry. |
|----+------------------------------------------------|
|8 |Delete the value CTIFWPW and paste the encrypted|
| |password from Step 3 into the field. |
|----+------------------------------------------------|
| |Restart the Cisco Telephony Call Dispatcher |
| |service by choosing Start > Programs > |
|9 |Administrative Tools > Services. Highlight the |
| |service in the list; right click on the service |
| |and then click Restart from the drop-down list. |
|----+------------------------------------------------|
|10 |Repeat Step 2 through Step 9 for each Cisco |
| |CallManager server in the cluster. |
+-----------------------------------------------------+
IMPORTANT: Please note that you must reboot the CM server in all cases
to reset the established TCP connections and recover the lost memory.
Alternatively, if you are not using the Cisco WebAttendant and/or the
Cisco Telephony Call Dispatcher Service, set it to \"manual\" or
\"disabled\" from the \"Services\" control panel.
Exploitation and Public Announcements
=====================================
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory.
Status of This Notice: Interim
==============================
This is a Interim advisory. Although Cisco cannot guarantee the
accuracy of all statements in this notice, all of the facts have been
checked to the best of our ability. Cisco does not anticipate issuing
updated versions of this advisory unless there is some material change
in the facts. Should here be a significant change in the facts, Cisco
may update this advisory.
Distribution
============
This notice will be posted on Cisco\'s Worldwide Web site at
http://www.cisco.com/warp/public/707/callmanager-ctifw-leak-pub.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-announce@cisco.com
* bugtraq@securityfocus.com
* first-teams@first.org (includes CERT/CC)
* cisco@spot.colorado.edu
* comp.dcom.sys.cisco
* firewalls@lists.gnac.com
* Various internal Cisco mailing lists
Future updates of this notice, if any, will be placed on Cisco\'s
Worldwide Web server, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the URL given above for any updates.
Revision History
================
+------------------------------------------------------+
|Revision|2002-Mar-27|Initial Public Release |
|Number |17:00 GMT | |
|1.0 | | |
+------------------------------------------------------+
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 Web site at
http://www.cisco.com/warp/public/707/sec_incident_response.shtml. This
includes instructions for press inquiries regarding Cisco security
notices. All Cisco Security Advisories are available at
http://www.cisco.com/go/psirt.
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This notice is Copyright 2002 by Cisco Systems, Inc. This notice may be
redistributed freely after the release date given at the top of the
text, provided that redistributed copies are complete and unmodified,
and include all date and version information.
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