Advisory ID: cisco-sa-20090923-cmeRevision 1.1
For Public Release 2009 September 23 16:00 UTC (GMT)
Cisco IOS® devices that are configured for
Cisco Unified Communications Manager Express (CME) and the Extension Mobility
feature are vulnerable to a buffer overflow vulnerability. Successful
exploitation of this vulnerability may result in the execution of arbitrary
code or a Denial of Service (DoS) condition on an affected device.
Cisco has released free software updates that address this
vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090923-cme.
Note: The September 23, 2009, Cisco IOS Security Advisory bundled
publication includes eleven Security Advisories. Ten of the advisories address
vulnerabilities in Cisco IOS Software, and one advisory addresses a
vulnerability in Cisco Unified Communications Manager. Each advisory lists the
releases that correct the vulnerability or vulnerabilities detailed in the
advisory.
Individual publication links are in "Cisco Event Response:
Semiannual Cisco IOS Software Advisory Bundled Publication" at the following
link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep09.html
Cisco IOS devices, including Cisco Unified Communications 500 Series,
that are configured for Cisco Unified CME and the Extension Mobility feature
are affected.
A Cisco IOS device that is configured for Cisco Unified CME and
Extension Mobility contains the following output when the show
running-config command is issued:
ephone [Ethernet phone tag]
...
logout-profile [logout-profile tag]
To determine the Cisco IOS Software release that is running on a Cisco
product, administrators can log in to the device and issue the show
version command to display the system banner. The system banner
confirms that the device is running Cisco IOS Software by displaying text
similar to "Cisco Internetwork Operating System Software" or "Cisco IOS
Software." The image name is displayed in parentheses, followed by "Version"
and the Cisco IOS Software release name. Other Cisco devices do not have the
show version command or may provide different output.
The following example identifies a Cisco product that is
running Cisco IOS Software Release 12.3(26) with an installed image name of
C2500-IS-L:
Router#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 17-Mar-08 14:39 by dchih
<output truncated>
The following example identifies a Cisco product that is running Cisco
IOS Software Release 12.4(20)T with an installed image name of
C1841-ADVENTERPRISEK9-M:
Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jul-08 20:25 by prod_rel_team
<output truncated>
Additional information about Cisco IOS Software release naming
conventions is available in "White Paper: Cisco IOS Reference Guide" at the
following link: http://www.cisco.com/warp/public/620/1.html
.
Cisco IOS devices that are configured for Survivable Remote Site
Telephony (SRST) Mode are not affected.
Cisco IOS XR is not affected.
Cisco IOS XE is not affected.
Cisco Unified Communications Manager is not
affected.
Cisco Unified CME is not affected unless configured to use
the Extension Mobility feature.
No other Cisco products are currently known to be affected
by these vulnerabilities.
Cisco Unified CME is the call processing component of an enhanced IP
telephony solution that is integrated into Cisco IOS.
The Extension Mobility feature in Cisco Unified CME
provides the benefit of phone mobility for end users. A user login service
allows phone users to temporarily access a physical phone other than their own
phone and utilize their personal settings, such as directory number, speed-dial
lists, and services, that is assigned to their own desk phone. The phone user
can make and receive calls on that phone using the same personal directory
number as is on their own desk phone. More information on Extension Mobility
feature is available at the following URL:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmemobl.html
A vulnerability in the login section of the Extension
Mobility feature may allow an unauthenticated attacker to execute arbitrary
code or cause a Denial of Service (DoS) condition. Such packets can only come
from registered phone IP addresses in the form of HTTP requests. If the
auto-registration feature is enabled, an attacker can register its IP address
and subsequently send a crafted payload to exploit this vulnerability. The
auto-registration feature is enabled by default. More information on
auto-registration can be found at the following link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/command/reference/cme_a1ht.html#wp1031242.
This vulnerability is addressed by the Cisco Bug ID
CSCsq58779
(
registered customers only)
and has been assigned
Common Vulnerabilities and Exposures (CVE) ID CVE-2009-2865.
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 .
|
CSCsq58779 - Vulnerability in Extension Mobility Feature
Calculate the environmental score of
Calculate the environmental score of Bug ID CVSS scoring link
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CVSS Base Score - 7.6
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Access Vector
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Access Complexity
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Authentication
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Confidentiality Impact
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Integrity Impact
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Availability Impact
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Network
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High
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None
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Complete
|
Complete
|
Complete
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CVSS Temporal Score - 6.3
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Exploitability
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Remediation Level
|
Report Confidence
|
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Functional
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Official-Fix
|
Confirmed
|
Successful exploitation of this vulnerability may result in the
execution of arbitrary code or a Denial of Service (DoS) condition on an
affected device.
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.
Each row of the Cisco IOS software table (below) names a
Cisco IOS release train. If a given release train is vulnerable, then the
earliest possible releases that contain the fix (along with the anticipated
date of availability for each, if applicable) are listed in the "First Fixed
Release" column of the table. The "Recommended Release" column indicates the
releases which have fixes for all the published vulnerabilities at the time of
this Advisory. A device running a release in the given train that is earlier
than the release in a specific column (less than the First Fixed Release) is
known to be vulnerable. Cisco recommends upgrading to a release equal to or
later than the release in the "Recommended Releases" column of the table.
|
Major Release
|
Availability of Repaired
Releases
|
|
Affected 12.0-Based Releases
|
First Fixed Release
|
Recommended Release
|
|
There are no affected 12.0 based releases.
|
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Affected 12.1-Based Releases
|
First Fixed Release
|
Recommended Release
|
|
There are no affected 12.1 based releases.
|
|
Affected 12.2-Based Releases
|
First Fixed Release
|
Recommended Release
|
|
There are no affected 12.2 based releases.
|
|
Affected 12.3-Based Releases
|
First Fixed Release
|
Recommended Release
|
|
There are no affected 12.3 based releases.
|
|
Affected 12.4-Based Releases
|
First Fixed Release
|
Recommended Release
|
|
12.4
|
Not Vulnerable
|
|
|
12.4GC
|
Not Vulnerable
|
|
|
12.4JA
|
Not Vulnerable
|
|
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12.4JDA
|
Not Vulnerable
|
|
|
12.4JDC
|
Not Vulnerable
|
|
|
12.4JDD
|
Not Vulnerable
|
|
|
12.4JK
|
Not Vulnerable
|
|
|
12.4JL
|
Not Vulnerable
|
|
|
12.4JMA
|
Not Vulnerable
|
|
|
12.4JMB
|
Not Vulnerable
|
|
|
12.4JX
|
Not Vulnerable
|
|
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12.4MD
|
Not Vulnerable
|
|
|
12.4MDA
|
Not Vulnerable
|
|
|
12.4MR
|
Not Vulnerable
|
|
|
12.4SW
|
Not Vulnerable
|
|
|
12.4T
|
Not Vulnerable
|
|
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12.4XA
|
Not Vulnerable
|
|
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12.4XB
|
Not Vulnerable
|
|
|
12.4XC
|
Not Vulnerable
|
|
|
12.4XD
|
Not Vulnerable
|
|
|
12.4XE
|
Not Vulnerable
|
|
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12.4XF
|
Not Vulnerable
|
|
|
12.4XG
|
Not Vulnerable
|
|
|
12.4XJ
|
Not Vulnerable
|
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12.4XK
|
Not Vulnerable
|
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12.4XL
|
Not Vulnerable
|
|
|
12.4XM
|
Not Vulnerable
|
|
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12.4XN
|
Not Vulnerable
|
|
|
12.4XP
|
Not Vulnerable
|
|
|
12.4XQ
|
Not Vulnerable
|
|
|
12.4XR
|
Not Vulnerable
|
|
|
12.4XT
|
Not Vulnerable
|
|
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12.4XV
|
Not Vulnerable
|
|
|
12.4XW
|
12.4(11)XW8
|
12.4(20)T4
12.4(22)T3
12.4(24)T2; Available on 23-OCT-2009
|
|
12.4XY
|
12.4(15)XY4
|
12.4(20)T4
12.4(22)T3
12.4(24)T2; Available on 23-OCT-2009
|
|
12.4XZ
|
12.4(15)XZ1
|
12.4(20)T4
12.4(22)T3
12.4(24)T2; Available on 23-OCT-2009
|
|
12.4YA
|
12.4(20)YA1
|
12.4(20)T4
12.4(22)T3
12.4(24)T2; Available on 23-OCT-2009
|
|
12.4YB
|
Not Vulnerable
|
|
|
12.4YD
|
Not Vulnerable
|
|
|
12.4YE
|
Not Vulnerable
|
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Cisco has released free software updates that address this
vulnerability. 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 vulnerability described in this advisory.
This vulnerability was found internally.
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-20090923-cme
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
|
2009-September-23
|
Initial public release
|
|
