__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Cisco Unified Communications Manager Vulnerabilities [Cisco Security Advisory Document ID: 107378] June 26, 2008 18:00 GMT Number S-330 ______________________________________________________________________________ PROBLEM: Cisco Unified Communications Manager (CUCM), formerly Cisco CallManager, contains a denial of service (DoS) vulnerability in the Computer Telephony Integration (CTI) Manager service that may cause an interruption in voice services and an authentication bypass vulnerability inthe Real-Time Information Server (RIS) Data Collector that may expose information that is useful for reconnaissance. PLATFORM: Cisco Unified CallManager 4.1 versions 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)SR1 Cisco Unified Communications Manager 5.x versions prior to 5.1(3c) Cisco Unified Communications Manager 6.x versions prior to 6.1(2) DAMAGE: DoS and authentication bypass. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is LOW. Successful exploitation of the vulnerabilities ASSESSMENT: in this advisory may result in the interruption of voice services or disclosure of information useful for reconnaissance. ______________________________________________________________________________ CVSS 2 BASE SCORE: 7.8 TEMPORAL SCORE: 6.4 VECTOR: (AV:N/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C) ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-330.shtml ORIGINAL BULLETIN: http://www.cisco.com/en/US/products/products_security_ advisory09186a00809b9011.shtml CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2008-2061 CVE-2008-2062 CVE-2008-2730 ______________________________________________________________________________ [***** Start Cisco Security Advisory Document ID: 107378 *****] Cisco Security Advisory: Cisco Unified Communications Manager Denial of Service and Authentication Bypass Vulnerabilities Document ID: 107378 Advisory ID: cisco-sa-20080625-cucm http://www.cisco.com/warp/public/707/cisco-sa-20080625-cucm.shtml Revision 1.0 For Public Release 2008 June 25 1600 UTC (GMT) -------------------------------------------------------------------------------- Contents Summary Affected Products Details Vulnerability Scoring Details Impact Software Versions and Fixes Workarounds Obtaining Fixed Software Exploitation and Public Announcements Status of this Notice: FINAL Distribution Revision History Cisco Security Procedures -------------------------------------------------------------------------------- Summary Cisco Unified Communications Manager (CUCM), formerly Cisco CallManager, contains a denial of service (DoS) vulnerability in the Computer Telephony Integration (CTI) Manager service that may cause an interruption in voice services and an authentication bypass vulnerability in the Real-Time Information Server (RIS) Data Collector that may expose information that is useful for reconnaissance. Cisco has released free software updates that address these vulnerabilities. There are no workarounds for these vulnerabilities. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080625-cucm.shtml. [Expand all sections] [Collapse all sections] Affected Products Vulnerable Products The following products are vulnerable: Cisco Unified CallManager 4.1 versions 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)SR1 Cisco Unified Communications Manager 5.x versions prior to 5.1(3c) Cisco Unified Communications Manager 6.x versions prior to 6.1(2) Administrators of systems running Cisco Unified Communications Manager (CUCM) version 4.x can determine the software version by navigating to Help > About Cisco Unified CallManager and selecting the Details button via the CUCM administration interface. Administrators of systems that are running CUCM versions 5.x and 6.x can determine the software version by viewing the main page of the CUCM 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. Top of the section Close Section Details Cisco Unified Communications Manager (CUCM) 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. Computer Telephony Integration Manager Related Vulnerability The Computer Telephony Integration (CTI) Manager service of CUCM versions 5.x and 6.x contains a vulnerability when handling malformed input that may result in a DoS condition. The CTI Manager service listens by default on TCP port 2748 and is not user-configurable. There is no workaround for this vulnerability. This vulnerability is fixed in CUCM versions 5.1(3c) and 6.1(2). This vulnerability is documented in Cisco Bug ID CSCso75027 and has been assigned Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-2061. Real-Time Information Server Data Collector Related Vulnerability The Real-Time Information Server (RIS) Data Collector service of CUCM versions 4.x, 5.x, and 6.x contains an authentication bypass vulnerability that may result in the unauthorized disclosure of certain CUCM cluster information. In normal operation, Real-Time Monitoring Tool (RTMT) clients gather CUCM cluster statistics by authenticating to a Simple Object Access Protocol (SOAP) based web interface. The SOAP interface proxies authenticated connections to the RIS Data Collector process. The RIS Data Collector service listens on TCP port 2556 by default and is user configurable. By connecting directly to the port that the RIS Data Collector process listens on, it may be possible to bypass authentication checks and gain read-only access to information about a CUCM cluster. The information available includes performance statistics, user names, and configured IP phones. This information may be used to mount further attacks. No passwords or other sensitive CUCM configuration may be obtained via this vulnerability. No CUCM configuration changes can be made. There is no workaround for this vulnerability. This vulnerability is fixed in CUCM versions 4.2(3)SR4, 4.3(2)SR1, 5.1(3), and 6.1(1). For CUCM 4.x versions, this vulnerability is documented in Cisco Bug ID CSCsq35151 and has been assigned CVE identifier CVE-2008-2062. For CUCM 5.x and 6.x versions, this vulnerability is documented in Cisco Bug ID CSCsj90843 and has been assigned CVE identifier CVE-2008-2730. Top of the section Close Section 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 . CSCso75027 - CTI Manager TSP Crash ( registered customers only) Calculate the environmental score of CSCso75027 CVSS Base Score - 7.8 Access Vector Access Complexity Authentication Confidentiality Impact Integrity Impact Availability Impact Network Low None None None Complete CVSS Temporal Score - 6.4 Exploitability Remediation Level Report Confidence Functional Official-Fix Confirmed CSCsq35151 - RISDC Authentication Bypass ( registered customers only) Calculate the environmental score of CSCsq35151 CVSS Base Score - 5 Access Vector Access Complexity Authentication Confidentiality Impact Integrity Impact Availability Impact Network Low None Partial None None CVSS Temporal Score - 4.1 Exploitability Remediation Level Report Confidence Functional Official-Fix Confirmed CSCsj90843 - RISDC Authentication Bypass ( registered customers only) Calculate the environmental score of CSCsj90843 CVSS Base Score - 5 Access Vector Access Complexity Authentication Confidentiality Impact Integrity Impact Availability Impact Network Low None Partial None None CVSS Temporal Score - 4.1 Exploitability Remediation Level Report Confidence Functional Official-Fix Confirmed Top of the section Close Section Impact Successful exploitation of the vulnerabilities in this advisory may result in the interruption of voice services or disclosure of information useful for reconnaissance. Top of the section Close Section 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 Communications Manager (CUCM) version 4.2(3)SR4 contains fixes for all vulnerabilities affecting CUCM version 4.2 listed in this advisory. Cisco Unified CallManager 4.1 version administrators are encouraged to upgrade to CUCM version 4.2(3)SR4 in order to obtain fixed software. Version 4.2(3)SR4 can be downloaded at the following link: http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Unified%20 Communications%20Manager%20Updates&mdfid=280264388&treeName=Voice%20and%20Unified% 20Communications&mdfLevel=Software%20Version/Option&url=null&modelName=Cisco%20Unified %20CallManager%20Version%204.2&isPlatform=N&treeMdfId=278875240&modifmdfid=null& imname=null&hybrid=Y&imst=N CUCM version 4.3(2)SR1 contains fixes for all vulnerabilities affecting CUCM version 4.3 listed in this advisory and is scheduled to be released in mid-July, 2008. Version 4.3(2)SR1 will be available for download at the following link: http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Unified%20 Communications%20Manager%20Updates&mdfid=280771554&treeName=Voice%20and%20Unified%20 Communications&mdfLevel=Software%20Version/Option&url=null&modelName=Cisco%20Unified %20Communications%20Manager%20Version%204.3&isPlatform=N&treeMdfId=278875240& modifmdfid=null&imname=null&hybrid=Y&imst=N CUCM version 5.1(3c) contains fixes for all vulnerabilities affecting CUCM version 5.x listed in this advisory. Version 5.1(3c) can downloaded at the following link: http://tools.cisco.com/support/downloads/go/ReleaseType.x?optPlat=null&isPlatform= Y&mdfid=280735907&sftType=Unified%20Communications%20Manager%20Updates&treeName= Voice%20and%20Unified%20Communications&modelName=Cisco%20Unified%20Communications% 20Manager%20Version%205.1&mdfLevel=Software%20Version/Option&treeMdfId=278875240& modifmdfid=null&imname=null&hybrid=Y&imst=N CUCM version 6.1(2) contains fixes for all vulnerabilities affecting CUCM version 6.x listed in this advisory. Version 6.1(2) can be downloaded at the following link: http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Unified%20 Communications%20Manager%20Updates&mdfid=281023410&treeName=Voice%20and%20Unified% 20Communications&mdfLevel=Software%20Version/Option&url=null&modelName=Cisco%20 Unified%20Communications%20Manager%20Version%206.1&isPlatform=N&treeMdfId=278875240& modifmdfid=null&imname=null&hybrid=Y&imst=N Top of the section Close Section Workarounds CTI Manager Related Vulnerability It is possible to mitigate the CTI Manager vulnerability (CSCso75027) by implementing filtering on screening devices. Administrators are advised to permit access to TCP port 2748 only from networks that contain systems running CTI-enabled applications. RIS Data Collector Related Vulnerability It is possible to mitigate the RIS Data Collector vulnerability (CSCsq35151 and CSCsj90843) by implementing filtering on screening devices. Administrators are advised to permit access to TCP port 2556 only from other CUCM cluster systems. It is possible to change the default port (TCP 2556) of the RIS Data Collector service. If changed, filtering should be based on the values used. The values of the ports can be viewed in the Cisco Unified Communications Manager (CUCM) administration interface by following the System > Service Parameters menu and selecting the appropriate service. 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-20080625-cucm.shtml Top of the section Close Section 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/products/prod_warranties_item09186a008088e31f.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 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@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/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. Top of the section Close Section Exploitation and Public Announcements The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. Cisco PSIRT greatly appreciates the opportunity to work with researchers on security vulnerabilities and welcomes the opportunity to review and assist in product reports. We would like to thank VoIPshield for working with us towards the goal of keeping Cisco networks and the Internet, as a whole, secure. Top of the section Close Section 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. Top of the section Close Section Distribution This advisory is posted on Cisco's worldwide website at : http://www.cisco.com/warp/public/707/cisco-sa-20080625-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@cisco.com first-teams@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. Top of the section Close Section Revision History Revision 1.0 2008-June-25 Initial public release [***** End Cisco Security Advisory Document ID: 107378 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Cisco for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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