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Cisco Security Advisory: Cisco Unified Communications
Manager Denial
of Service Vulnerabilities
Advisory ID: cisco-sa-20080514-cucmdos
Revision 1.0
+-----------------------------------------------------------
----------
Summary
=======
Cisco Unified Communications Manager, formerly Cisco
CallManager,
contains multiple denial of service (DoS) vulnerabilities
that may
cause an interruption in voice services, if exploited.
These
vulnerabilities were discovered internally by Cisco. The
following
Cisco Unified Communications Manager services are affected:
* Certificate Trust List (CTL) Provider
* Certificate Authority Proxy Function (CAPF)
* Session Initiation Protocol (SIP)
* Simple Network Management Protocol (SNMP) Trap
Cisco has released free software updates that address these
vulnerabilities. Workarounds that mitigate some of these
vulnerabilities are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-
sa-20080514-cucmdos.shtml.
Affected Products
=================
Vulnerable Products
+------------------
These products are vulnerable:
* Cisco Unified CallManager 4.1 versions prior to
4.1.3SR7
* Cisco Unified Communications Manager 4.2 versions prior
to 4.2(3)SR4
* Cisco Unified Communications Manager 4.3 versions prior
to 4.3(2)
* Cisco Unified Communications Manager 5.x versions prior
to 5.1(3)
* Cisco Unified Communications Manager 6.x versions prior
to 6.1(1)
Administrators of systems running Cisco Unified
Communications
Manager version 4.x can determine the software version by
navigating
to Help > About Cisco Unified CallManager and selecting
the Details
button via the Cisco Unified Communications Manager
Administration
interface.
Administrators of systems that are running Cisco Unified
Communications Manager versions 5.x and 6.x can determine
the
software version by viewing the main page of the Cisco
Unified
Communications Manager Administration interface. The
software version
can also be determined by running the command show version
active via
the command line interface (CLI).
Products Confirmed Not Vulnerable
+--------------------------------
Cisco Unified Communications Manager Express 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, voice-over-IP (VoIP)
gateways,
and multimedia applications.
Certificate Trust List Provider Related Vulnerabilities
The Certificate Trust List (CTL) Provider service of Cisco
Unified
Communications Manager version 5.x contains a memory
consumption
vulnerability that occurs when a series of malformed TCP
packets are
received by a vulnerable Cisco Unified Communications
Manager system
and may result in a DoS condition. The CTL Provider service
listens
by default on TCP port 2444 and is user configurable. The
CTL
Provider service is enabled by default. There is a
workaround for
this vulnerability. The vulnerability is fixed in Cisco
Unified
Communications Manager version 5.1(3). The vulnerability is
documented in Cisco Bug ID CSCsj80609 and has been assigned
the
CVE identifier CVE-2008-1742.
The CTL Provider service of Cisco Unified Communications
Manager
versions 5.x and 6.x contain a memory consumption
vulnerability that
occurs when a series of malformed TCP packets are received
by a
vulnerable Cisco Unified Communications Manager system and
may result
in a DoS condition. The CTL Provider service listens by
default on
TCP port 2444 and is user configurable. There is a
workaround for
this vulnerability. The vulnerability is fixed in Cisco
Unified
Communications Manager versions 5.1(3) and 6.1(1). This
vulnerability
is documented in Cisco Bug ID CSCsi98433 and has been
assigned the
CVE identifier CVE-2008-1743.
Certificate Authority Proxy Function Related Vulnerability
The Certificate Authority Proxy Function (CAPF) service of
Cisco
Unified Communications Manager versions 4.1, 4.2 and 4.3
contain a
vulnerability when handling malformed input that may result
in a DoS
condition. The CAPF service listens by default on TCP port
3804 and
is user configurable. The CAPF service is disabled by
default. There
is a workaround for this vulnerability. This vulnerability
is fixed
in Cisco Unified Communications Manager versions 4.1(3)SR7,
4.2(3)SR4
and 4.3(2). This vulnerability is documented in Cisco Bug ID
CSCsk46770 and has been assigned the CVE identifier
CVE-2008-1744.
SIP-Related Vulnerabilities
Cisco Unified Communications Manager versions 5.x and 6.x
contain a
vulnerability in the handling of malformed SIP JOIN messages
that may
result in a DoS condition. SIP processing cannot be disabled
in Cisco
Unified Communications Manager. There is no workaround for
this
vulnerability. This vulnerability is fixed in Cisco Unified
Communications Manager versions 5.1(2) and 6.1(1). This
vulnerability
is documented in Cisco Bug ID CSCsi48115 and has been
assigned the
CVE identifier CVE-2008-1745.
Cisco Unified Communications Manager versions 4.1, 4.2, 4.3,
5.x and
6.x contain a vulnerability in the handling of SIP INVITE
messages
that may result in a DoS condition. SIP processing cannot be
disabled
in Cisco Unified Communications Manager. There is no
workaround for
this vulnerability. The vulnerability is fixed in Cisco
Unified
Communications Manager versions 4.1(3)SR6, 4.2(3)SR3,
4.3(2), 5.1(3)
and 6.1(1). This vulnerability is documented in Cisco Bug ID
CSCsk46944 and has been assigned the CVE identifier
CVE-2008-1747.
Cisco Unified Communications Manager versions 4.1, 4.2, 4.3,
5.x and
6.x contain a vulnerability in the handling of SIP INVITE
messages
that may result in a DoS condition. SIP processing cannot be
disabled
in Cisco Unified Communications Manager. There is no
workaround for
this vulnerability. This vulnerability is fixed in Cisco
Unified
Communications Manager versions 4.1(3)SR7, 4.2(3)SR4,
4.3(2), 5.1(3)
and 6.1(1). This vulnerability is documented in Cisco Bug ID
CSCsl22355 and has been assigned the CVE identifier
CVE-2008-1748.
SNMP Trap-Related Vulnerability
The SNMP Trap Agent service of Cisco Unified Communications
Manager
versions 4.1, 4.2, 4.3, 5.x and 6.x contain a vulnerability
that
occurs when a series of malformed UDP packets are received
by a
vulnerable Cisco Unified Communications Manager system and
may result
in a DoS condition. The SNMP Trap Agent service listens by
default on
UDP port 61441. There is a workaround for this
vulnerability. This
vulnerability is fixed in Cisco Unified Communications
Manager
versions 4.1(3)SR6, 4.2(3)SR3, 4.3(2), 5.1(3) and 6.1(1).
This
vulnerability is documented in Cisco Bug ID CSCsj24113 and
has been
assigned the CVE identifier CVE-2008-1746.
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/int
elligence/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/cv
ss
* CSCsj80609 - Memory Leak Due to TCPFUZZ on Port 2444
(CTLProvider)
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
* CSCsi98433 - CTLProvider leaks memory in certain
scenarios
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
* CSCsk46770 - CAPF crash with network traffic
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
* CSCsi48115 - CM 6.1 stops providing service when receiving
malformed Join sip-header
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
* CSCsk46944 - CCM service restarts on receiving a valid SIP
Packet
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
* CSCsl22355 - CCM does not validate SIP URL input properly
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
* CSCsj24113 - CCM Process Coredump/Restart During ISIC
Execution Against Port 61441
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
Impact
======
Successful exploitation of the vulnerabilities in this
advisory may
result in the interruption of voice services.
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.
Cisco Unified CallManager version 4.1(3)SR7 contains fixes
for all
vulnerabilities affecting Cisco Unified CallManager version
4.1
listed in this advisory. It can downloaded at the following
link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/c
allmgr-41?psrtdcat20e2
Cisco Unified Communications Manager version 4.2(3)SR4
contains fixes
for all vulnerabilities affecting Cisco Unified
Communications
Manager version 4.2 listed in this advisory and is scheduled
to be
released in early June, 2008. It will be available for
download at
the following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/c
allmgr-42?psrtdcat20e2
Cisco Unified Communications Manager version 4.3(2) contains
fixes
for all vulnerabilities affecting Cisco Unified
Communications
Manager version 4.2 listed in this advisory. It can
downloaded at the
following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/c
allmgr-43?psrtdcat20e2
Cisco Unified Communications Manager version 5.1(3) contains
fixes
for all vulnerabilities affecting Cisco Unified
Communications
Manager version 5.x listed in this advisory. It can
downloaded at the
following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/c
allmgr-51?psrtdcat20e2
Cisco Unified Communications Manager version 6.1(1) contains
fixes
for all vulnerabilities affecting Cisco Unified
Communications
Manager version 6.x listed in this advisory. It can
downloaded at the
following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/c
allmgr-61?psrtdcat20e2
Workarounds
===========
CTL Provider Related Vulnerabilities
To mitigate against the CTL Provider service
vulnerabilities
(CSCsj80609 and CSCsi98433), system administrators can
disable the
CTL Provider service if it is not needed. Access to the CTL
Provider
Service is usually only required during the initial
configuration of
Cisco Unified Communications Manager authentication and
encryption
features. The CTL Provider service is controlled via the
Cisco CTL
Provider menu selection.
It is possible to mitigate the CTL Provider vulnerabilities
by
implementing filtering on screening devices. If the CTL
Provider
service is enabled, permit access to TCP port 2444 only
between the
Cisco Unified Communications Manager systems where the CTL
Provider
service is active and the CTL Client, usually on the
administrator's
workstation, to mitigate the CTL Provider service overflow.
Note: It is possible to change the default port of the CTL
Provider
service (TCP port 2444). If changed, filtering should be
based on the
values used. The values of the ports can be viewed in Cisco
Unified
Communications Manager Administration interface by following
the
System > Service Parameters menu and selecting the
appropriate
service.
CAPF Related Vulnerability
To mitigate against the CAPF service vulnerability
(CSCsk46770),
system administrators can disable the CAPF service if it is
not
needed. Access to the CAPF service is only required if Cisco
Unified
Communications Manager systems and IP phone devices are
configured to
use certificates for a secure deployment. If phones are not
configured to use certificates, then the CAPF service can
be
disabled. The CAPF service is controlled by the Cisco
Certificate
Authority Proxy Function menu selection.
It is possible to mitigate the CAPF vulnerability by
implementing
filtering on screening devices. If the CAPF service is
enabled,
permit access to TCP port 3804 only from networks that
contain IP
phone devices needing to utilize the CAPF service.
SIP-Related Vulnerabilities
It is possible to mitigate the SIP vulnerabilities by
implementing
filtering on screening devices. Permit TCP/UDP access to
ports 5060
and 5061 from only networks that need SIP access to Cisco
Unified
Communications Manager servers.
SNMP Trap-Related Vulnerability
To mitigate against the SNMP Trap service vulnerability
(CSCsj24113),
system administrators can disable the SNMP Trap service. For
Cisco
Unified Communications Manager 4.x systems, the SNMP Trap
service is
controlled by the embedded Windows SNMP sevice. To disable
the
Windows SNMP service, navigate to Start > Programs >
Administrative
Tools > Services, and stop the SNMP Service.
Note: The SNMP Trap Service listed in the Windows Service
configuration screen is not applicable to this vulnerability
and
disabling it does not provide any benefit as a workaround
for this
vulnerability. For Cisco Unified Communications Manager 5.x
and 6.x
systems, the SNMP Trap service is controlled via the Cisco
CallManager SNMP Service selection on the Control Center
Feature
Services screen.
It is possible to mitigate the SNMP Trap service
vulnerability by
implementing filtering on screening devices. Permit access
to UDP
port 61441 only from management systems that need access to
the SNMP
Trap service.
For Cisco Unified Communications Manager 4.x systems, please
consult
the following documentation for details on how to disable
Cisco
Unified Communications Manager services:
h
ttp://www.cisco.com/en/US/products/sw/voicesw/ps556/products
_administration_guide_chapter09186a008070ec49.html
For Cisco Unified Communications Manager 5.x and 6.x
systems, please
consult the following documentation for details on how to
disable
Cisco Unified Communications Manager services:
http://www.cisco.com/en/US/products/sw/voicesw/ps55
6/products_administration_guide_chapter09186a008037ced2.html
#wp1048220
Additional mitigation techniques that can be deployed on
Cisco
devices within the network are available in the Cisco
Applied
Mitigation Bulletin companion document for this advisory:
http://www.cisco.com/warp/public/707/cisco-
amb-20080514-cucmdos.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.
ustomers 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/products/prod_warranties_item09186a00808
8e31f.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 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 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: taccisco.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/warp/public/687/Directory/DirTAC
.shtml
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 vulnerabilities described in this advisory.
These vulnerabilities were discovered internally by Cisco.
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-s
a-20080514-cucmdos.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 | 2008-May-14 | 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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