[c-nsp] Cisco Security Advisory: Multiple Vulnerabilities in Cisco Unified Communications Manager

Wed Apr 27 11:59:00 EDT 2011

Cisco Unified Communications Manager (previously known as Cisco
CallManager) contains the following vulnerabilities:

  * Three (3) denial of service (DoS) vulnerabilities that affect
    Session Initiation Protocol (SIP) services
  * Directory transversal vulnerability
  * Two (2) SQL injection vulnerabilities

Cisco has released free software updates for affected Cisco Unified
Communications Manager versions to address the vulnerabilities. A
workaround exists only for the SIP DoS vulnerabilities.

This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20110427-cucm.shtml.

Affected Products
=================

Vulnerable Products
+------------------

The following products are affected by at least one of the
vulnerabilities that are described in this advisory:

  * Cisco Unified Communications Manager 6.x
  * Cisco Unified Communications Manager 7.x
  * Cisco Unified Communications Manager 8.x

Note: Cisco Unified Communications Manager version 5.1 reached end of
software maintenance on February 13, 2010. Customers who are using
Cisco Unified Communications Manager 5.x versions should contact your
Cisco support team for assistance in upgrading to a supported version
of Cisco Unified Communications Manager.

Products Confirmed Not Vulnerable
+--------------------------------

Cisco Unified Communications Manager version 4.x is not affected by
these vulnerabilities. No other Cisco products are currently known to
be affected by these vulnerabilities.

Details
=======

Cisco Unified Communications Manager is the call processing component
of the Cisco IP Telephony solution that extends enterprise telephony
features and functions to packet telephony network devices such as IP
phones, media processing devices, VoIP gateways, and multimedia
applications.

DoS Vulnerabilities in SIP
+-------------------------

Cisco Unified Communications Manager contains three DoS
vulnerabilities that involve the processing of SIP messages. Each
vulnerability is triggered by a malformed SIP message that could
cause a critical process to fail, resulting in the disruption of
voice services. All SIP ports (TCP ports 5060 and 5061 and UDP ports
5060 and 5061) are affected.

The first SIP DoS vulnerability is documented in Cisco Bug ID CSCti42904
and has been assigned Common Vulnerabilities and Exposures (CVE)
identifier CVE-2011-1604. This vulnerability is fixed in Cisco Unified
Communications Manager versions 8.5(1), 8.0(3a)su2, 7.1(5b)su3, and
6.1(5)su3.

The second SIP DoS vulnerability is documented in Cisco Bug ID
CSCth39586 and has been assigned CVE identifier CVE-2011-1605. This
vulnerability is fixed in Cisco Unified Communications Manager versions
8.5(1), 8.0(3), 7.1(5b)su2, and 6.1(5)su2.

The third SIP DoS vulnerability is documented in Cisco Bug ID CSCtg62855
and has been assigned CVE identifier CVE-2011-1606. This vulnerability
is fixed in Cisco Unified Communications Manager versions 8.5(1),
8.0(3), 7.1(5)su1, and 6.1(5)su2.

Directory Transversal Vulnerability
+----------------------------------

Cisco Unified Communications Manager contains a vulnerability that
involves the processing of POST requests. An authenticated, remote
attacker with the ability to intercept a packet to the affected device
could specify a different location or filename, which may result in the
upload of a malicious file. This vulnerability is documented in Cisco
Bug ID CSCti81603 and has been assigned CVE identifier CVE-2011-1607.
The second vulnerability is fixed in Cisco Unified Communications
Manager versions 8.5(1), 8.0(3a)su1, 7.1(5b)su3, and 6.1(5)su3.

SQL Injection Vulnerabilities
+----------------------------

Cisco Unified Communications Manager is affected by the following SQL
injection vulnerabilities:

  * The first vulnerability could allow an authenticated, remote
    attacker to modify the system configuration; create, modify and delete
    users; or modify the configuration of Cisco Unified Communications
    Manager. This vulnerability is documented in Cisco Bug ID CSCtg85647
    and has been assigned CVE identifier CVE-2011-1609. This vulnerability
    is fixed in Cisco Unified Communications Manager versions 8.5(1),
    8.0(3), 7.1(5)su1, and 6.1(5)su2.

  * The second vulnerability could allow an unauthenticated, remote
    attacker to modify system configuration; create, modify, and delete
    users; or modify the configuration of Cisco Unified Communications
    Manager. This vulnerability is documented in Cisco Bug ID CSCtj42064
    and has been assigned CVE identifier CVE-2011-1610. This vulnerability
    is fixed in Cisco Unified Communications Manager versions 8.5(1)su1,
    8.0(3a)su2, 7.1(5)su4, and 6.1(5)su3.

Vulnerability Scoring Details
=============================

Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding
CVSS at:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at:

http://intellishield.cisco.com/security/alertmanager/cvss

* CSCth39586 ("Core dump when processing certain SIP packets")

CVSS Base Score - 7.8
    Access Vector -            Network
    Access Complexity -        Low
    Authentication -           None
    Confidentiality Impact -   None
    Integrity Impact -         None
    Availability Impact -      Complete

CVSS Temporal Score - 6.4
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

* CSCtg62855 ("Core dump when processing certain SIP packets")

CVSS Base Score - 7.8
    Access Vector -            Network
    Access Complexity -        Low
    Authentication -           None
    Confidentiality Impact -   None
    Integrity Impact -         None
    Availability Impact -      Complete

CVSS Temporal Score - 6.4
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

* CSCti42904 ("Memory leak may be experienced when processing certain
SIP packets")

CVSS Base Score - 7.1
    Access Vector -            Network
    Access Complexity -        Medium
    Authentication -           None
    Confidentiality Impact -   None
    Integrity Impact -         None
    Availability Impact -      Complete

CVSS Temporal Score - 5.9
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

* CSCti81603 ("Cisco Unified Reporting fails to prohibit uploading of
files")

CVSS Base Score - 6.5
    Access Vector -            Network
    Access Complexity -        Low
    Authentication -           Single
    Confidentiality Impact -   Partial
    Integrity Impact -         Partial
    Availability Impact -      Partial

CVSS Temporal Score - 5.4
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

* CSCtg85647 ("Database Security Issue")

CVSS Base Score - 8.5
    Access Vector -            Network
    Access Complexity -        Medium
    Authentication -           Single
    Confidentiality Impact -   Complete
    Integrity Impact -         Complete
    Availability Impact -      Complete

CVSS Temporal Score - 7.0
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

* CSCtj42064 ("Potential SQL Injection")

CVSS Base Score - 6.4
    Access Vector -            Network
    Access Complexity -        Low
    Authentication -           None
    Confidentiality Impact -   Partial
    Integrity Impact -         Partial
    Availability Impact -      None

CVSS Temporal Score - 5.3
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

Impact
======

Successful exploitation of the vulnerabilities that are described in
this advisory could result in the interruption of voice services,
privilege escalation and possible data modification. In the case of
DoS attacks, the affect Cisco Unified Communications Manager
processes will restart, but repeated attacks may result in a
sustained DoS condition.

Software Versions 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.

When considering software upgrades, also consult
http://www.cisco.com/go/psirt and any subsequent advisories to determine
exposure and a complete upgrade solution. Cisco recommends upgrading
to a release equal to or later than the release in the "Recommended
Releases" column of the table.

+------------------------------------------------------------+
|  Cisco Unified Communications Manager  |    Recommended    |
|                Version                 |     Releases      |
|----------------------------------------+-------------------|
| 6.x                                    | 6.1(5)SU3         |
|----------------------------------------+-------------------|
| 7.x                                    | 7.1(5b)SU4        |
|----------------------------------------+-------------------|
| 8.0                                    | 8.0(3a)SU2        |
|----------------------------------------+-------------------|
| 8.5                                    | 8.5(1)SU1         |
+------------------------------------------------------------+

Note: The 7.1(5b)SU4 release of Cisco Unified Communications Manager
is expected to be available by the end of April 2011.

Workarounds
===========

A workaround exists only for the SIP DoS vulnerabilities. Cisco
Unified Communications Manager versions 6.1(4), 7.1(2), and 8.0(1)
introduced the ability to disable SIP processing. SIP processing is
enabled by default. Customers who do not use SIP processing can use
the following instructions to disable SIP processing:

  * Step 1: Log into the Cisco Unified Communications Manager
    Administration web interface.

  * Step 2: Navigate to "System" > "Service Parameters" and select the
    appropriate Cisco Unified Communications Manager server and the Cisco
    CallManager Service.

  * Step 3: Change the "SIP Interoperability Enabled" parameter to
    False, and click "Save".

    Note: For a SIP processing change to take effect, the Cisco
    CallManager Service must be restarted. For information on how to
    restart the service, refer to the "Restarting the Cisco
    CallManager Service" section of the document at the following
    location:

    http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/7_1_2/ccmcfg/b03dpi.html#wp1075124

    It is possible to mitigate these vulnerabilities by implementing
    filtering on screening devices and permitting access to TCP ports
    5060 and 5061 and UDP ports 5060 and 5061 only from networks that
    require SIP access to Cisco Unified Communications Manager
    servers.

    Additional mitigations that can be deployed on Cisco devices in
    the network are available in the companion document "Cisco
    Applied Mitigation Bulletin: Identifying and Mitigating
    Exploitation of the Multiple Vulnerabilities in Cisco Unified
    Communications Manager" which is available at the following
    location:

    http://www.cisco.com/warp/public/707/cisco-amb-20110427-cucm.shtml

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 at cisco.com or security-alert at 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 at 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.

The SQL injection vulnerabilities were reported to Cisco by
TippingPoint's Zero Day Initiative and Cigital. They were discovered by
Alberto Revelli of Cigital, Timothy Morgan of vSecurity, and Sven Taute.

The remainder of the vulnerabilities were found during internal
testing and during the troubleshooting of customer service requests.

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://www.cisco.com/warp/public/707/cisco-sa-20110427-cucm.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 at cisco.com
  * first-bulletins at lists.first.org
  * bugtraq at securityfocus.com
  * vulnwatch at vulnwatch.org
  * cisco at spot.colorado.edu
  * cisco-nsp at puck.nether.net
  * full-disclosure at lists.grok.org.uk
  * comp.dcom.sys.cisco at 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 1.0  | 2011-April-27  | 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/en/US/products/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/go/psirt.

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Copyright 2010-2011 Cisco Systems, Inc. All rights reserved.
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Updated: Apr 27, 2011                             Document ID: 112878
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