ID

VAR-200903-0275

CVE

CVE-2009-0632

TITLE

Cisco Unified Communications Manager of IP Phone Personal Address Book (PAB) Synchronizer Elevation of privilege vulnerability in functionality

DESCRIPTION

The IP Phone Personal Address Book (PAB) Synchronizer feature in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.1, 4.2 before 4.2(3)SR4b, 4.3 before 4.3(2)SR1b, 5.x before 5.1(3e), 6.x before 6.1(3), and 7.0 before 7.0(2) sends privileged directory-service account credentials to the client in cleartext, which allows remote attackers to modify the CUCM configuration and perform other privileged actions by intercepting these credentials, and then using them in requests unrelated to the intended synchronization task, as demonstrated by (1) DC Directory account credentials in CUCM 4.x and (2) TabSyncSysUser account credentials in CUCM 5.x through 7.x. Cisco Unified Communications Manager is prone to a remote privilege-escalation vulnerability. Attackers can exploit this issue to gain administrative access to the affected device and completely compromise it. This issue is tracked by Cisco Bug ID CSCso76587 and CSCso78528. PROVIDED AND/OR DISCOVERED BY: The vendor credits Olivier Grosjeanne of Dimension Data France and Oliver Dewdney of LBI. Subscribe: http://secunia.com/advisories/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. ---------------------------------------------------------------------- Unsubscribe: Secunia Security Advisories http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org ---------------------------------------------------------------------- . Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. The software version can also be determined by running the command show version active via the command line interface (CLI). No other Cisco products are currently known to be affected by this vulnerability. If an attacker is able to intercept the credentials, they can perform unauthorized modifications to the Cisco Unified Communications Manager configuration and extend their privileges. Cisco Unified Communications Manager 4.x +--------------------------------------- Cisco Unified Communications Manager software version 4.x by default stores user information using an internal Lightweight Directory Access Protocol (LDAP) server called DC Directory. Depending on how a Cisco Unified Communications Manager is configured, an attacker may obtain different privilege levels using the intercepted credentials. By default, Cisco Unified Communications Manager software version 4.x administrator accounts are created as part of an underlying Microsoft Windows operating system. If an attacker obtains the DC Directory credentials and MLA is enabled, the attacker can add an existing account to the Cisco Unified Communications Manager super-user group. If MLA is not enabled, the attacker cannot escalate their privileges; however, they can modify any user settings in the directory. The DC Directory credentials are passed in the clear over the network and are vulnerable to being sniffed by an attacker. If using the DC Directory internal LDAP server, the IP Phone PAB Synchronizer client communicates to Cisco Unified Communications Manager on TCP ports 8404 and 8405. The IP Phone PAB Synchronizer client uses the AXL application programming interface (API) to perform address book synchronization. After a client successfully authenticates, the Cisco Unified Communications Manager returns credentials for a database user account named TabSyncSysUser that will be used by the client to synchronize an user's address book. Using the TabSyncSysUser credentials via the AXL API, an attacker can modify any parameter in the database including creating new administrator accounts. Directory Service Integration +---------------------------- Cisco Unified Communications Manager software versions 4.x, 5.x, 6.x, and 7.x can be integrated with Microsoft Active Directory and several non-Microsoft LDAP servers to perform user authentication. In order to function properly, the integration process requires that appropriate user credentials for the directory service are provided to Cisco Unified Communications Manager. Administrators should ensure that any directory service credentials used for the Cisco Unified Communications Manager integration process are configured to follow the principle of least privilege. The credentials should be configured with only the privileges necessary to access the directory service data needed for the integration process to function properly. The use of overly privileged administrator accounts is discouraged. This vulnerability is documented in Cisco Bug IDs CSCso76587 and CSCso78528 and has been assigned Common Vulnerabilities and Exposures (CVE) identifier CVE-2009-0632. Vulnerability Scoring Details ============================= Cisco has provided scores for the vulnerability 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 CSCso76587 - Directory Manager password sent in clear from client CVSS Base Score - 9 Access Vector - Network Access Complexity - Low Authentication - Single Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete CVSS Temporal Score - 7.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed CSCso78528 - TabSyncSysUser (axl user) password sent in clear from client CVSS Base Score - 9 Access Vector - Network Access Complexity - Low Authentication - Single Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete CVSS Temporal Score - 7.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed Impact ====== Successful exploitation of this vulnerability may allow an attacker to intercept user credentials that allow the attacker to escalate their privilege level and obtain complete administrative access to a vulnerable Cisco Unified Communications Manager system. If integrated with an external directory service, the intercepted user credentials may allow an attacker to gain access to additional systems configured to use the directory service for authentication. 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. Version 7.0(2) can be downloaded at the following link: http://tools.cisco.com/support/downloads/go/ReleaseType.x?optPlat=&isPlatform=Y&mdfid=281941895&sftType=Unified+Communications+Manager+Updates&treeName=Voice+and+Unified+Communications&modelName=Cisco+Unified+Communications+Manager+Version+7.0&mdfLevel=Software%20Version/Option&treeMdfId=278875240&modifmdfid=null&imname=&hybrid=Y&imst=N Workarounds =========== It is possible to mitigate against this vulnerability using the following workarounds. Employing this workaround will prevent address book synchronization; however, the PAB application will continue to function. The ASP script can be moved using the following command: C:\> move c:\CiscoWebs\User\LDAPDetails.asp c:\temp It is also possible to mitigate this vulnerability by implementing filtering on screening devices or using the Windows firewall. Administrators are advised to permit access to TCP ports 8404 and 8405 only from trusted networks. Cisco Unified Communications Manager 5.x, 6.x, 7.x +------------------------------------------------- It is possible to mitigate this vulnerability by restricting the permissions of the TabSyncSysUser database user account. Remove all groups from the account and change the password. Employing this workaround will prevent address book synchronization; however, the PAB application will continue to function. The whitepaper can be downloaded here: http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080a83435.shtml 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-20090311-cucmpab.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/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/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. 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-20090311-cucmpab.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-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. Revision History ================ +---------------------------------------+ | Revision | | Initial | | 1.0 | 2009-March-11 | 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (SunOS) iD8DBQFJt9DF86n/Gc8U/uARAtjqAJ9eE9ETbc4lyUJV8GrCEmiaJeS1NACdExbB dLmiSiaPCdGHpVKTKvZj78k= =C3h7 -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

trust management

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Olivier Grosjeanne Oliver Dewdney

SOURCES

LAST UPDATE DATE

2024-11-23T22:39:33.076000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE