Advisory ID: cisco-sa-20100825-cupRevision 1.0
For Public Release 2010 August 25 16:00 UTC (GMT)
Cisco Unified Presence contains two denial of service (DoS)
vulnerabilities that affect the processing of Session Initiation Protocol (SIP)
messages. Exploitation of these vulnerabilities could cause an interruption of
presence services.
Cisco has released free software updates that address these
vulnerabilities. There are no workarounds for these vulnerabilities.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100825-cup.
The following products are affected:
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Cisco Unified Presence 6.0 versions prior to 6.0(7)
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Cisco Unified Presence 7.0 versions prior to 7.0(8)
Note: Cisco Unified Presence version 8.0(1) shipped
with software fixes for all the vulnerabilities described in this
advisory.
Administrators of systems running Cisco Unified Presence can determine
the software version by viewing the main page of the Cisco Unified Presence
Administration interface. The software version can be determined by running the
command show version active using the command line interface
(CLI).
No other Cisco products are currently known to be affected by these
vulnerabilities.
Cisco Unified Presence contains two 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, which could result in
the disruption of presence services. All SIP ports (TCP ports 5060 and 5061,
UDP ports 5060 and 5061) are affected.
The first SIP DoS vulnerability is documented in Cisco bug ID
CSCtd14474 and has been assigned the CVE identifier CVE-2010-2839. This
vulnerability is fixed in Cisco Unified Presence versions 6.0(7) and
7.0(8).
The second SIP DoS vulnerability is documented in Cisco bug ID
CSCtd39629 and has been assigned the CVE identifier CVE-2010-2840. This
vulnerability is fixed in Cisco Unified Presence versions 6.0(7) and
7.0(8).
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
Successful exploitation of any of the vulnerabilities may result in the
interruption of presence services. Cisco Unified Presence will restart the
affected processes, but repeated attacks may result in a sustained DoS
condition.
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.
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Cisco Unified Presence Version
|
Recommended Release
|
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6.0
|
6.0(7)
|
|
7.0
|
7.0(8)
|
Cisco Unified Presence software can be downloaded at the following
link:
http://tools.cisco.com/support/downloads/go/Redirect.x?mdfid=280448682
There are no workarounds for the vulnerabilities described in this
advisory.
It is possible to mitigate these vulnerabilities by implementing
filtering on screening devices and permitting access to TCP ports 5060 and 5061
and to UDP ports 5060 and 5061 only from networks that require SIP access to
Cisco Unified Communications Manager servers.
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://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20100825-cucm-cup
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@cisco.com or security-alert@cisco.com
for software upgrades.
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 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 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@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.
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory.
All vulnerabilities described in this advisory were discovered as a
result of internal testing conducted by Cisco.
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.
This advisory is posted on Cisco's worldwide website at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100825-cup
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
-
first-bulletins@lists.first.org
-
bugtraq@securityfocus.com
-
vulnwatch@vulnwatch.org
-
cisco@spot.colorado.edu
-
cisco-nsp@puck.nether.net
-
full-disclosure@lists.grok.org.uk
-
comp.dcom.sys.cisco@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.
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Revision 1.0
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2010-August-25
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Initial public release.
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