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Active Template Library (ATL) Vulnerability

Advisory ID: cisco-sa-20090728-activex

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090728-activex

Revision 1.0

For Public Release 2009 July 28 18:00  UTC (GMT)


Summary

Certain Cisco products that use Microsoft Active Template Libraries (ATL) and headers may be vulnerable to remote code execution. In some instances, the vulnerability may be exploited against Microsoft Internet Explorer to perform kill bit bypass. In order to exploit this vulnerability, an attacker must convince a user to visit a malicious web site.

Cisco will release free software updates for products that are affected by this vulnerability. Workarounds that mitigate this vulnerability are available.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090728-activex.

Affected Products

Vulnerable Products

The following products are affected by this vulnerability:

  • Cisco Unity 4.x, 5x., and 7.x

Products Confirmed Not Vulnerable

The following Cisco products are not known to be affected by this vulnerability:

  • Cisco AnyConnect VPN Client
  • Cisco Adaptive Security Device Manager (ASDM)
  • Cisco Building Broadband Service Manager (BBSM)
  • Cisco Catalyst Operating System (Catalyst OS)
  • Cisco Computer Telephony Integration Object Server (CTI)
  • Cisco IOS Software
  • Cisco IP/TV
  • Cisco Meetingplace
  • Cisco Mobile Wireless Fault Mediator (MWFM)
  • Cisco NAC Appliance (formerly Cisco Clean Access)
  • Cisco Secure Access Control Server (ACS)
  • Cisco Secure Desktop
  • Cisco Security Agent
  • Cisco Security Monitoring, Analysis and Response System (MARS)
  • Cisco SSL VPN Client (SVC)
  • Cisco Unified Contact Center Express (Unified CCX)
  • Cisco Video Surveillance Media Server (VSMS)
  • CiscoWorks LAN Management Solution (LMS)
  • WebEx

Details

Microsoft has identified vulnerabilities in the Active Template Library (ATL) headers that are shipped with the Software Development Kit (SDK) for Microsoft Windows systems and used in Cisco products. In general, this vulnerability, if exposed by an ActiveX control, could lead to remote code execution on a client's system.

For complete details, please review the Microsoft Security Bulletin at: http://www.microsoft.com/technet/security/Bulletin/MS09-035.mspx

The following Bug IDs have been filed for Cisco Products affected by this vulnerability:

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.

Vulnerability in the ActiveX headers used in Unity

Calculate the environmental score of CSCta71728

CVSS Base Score - 9.3

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

Complete

Complete

Complete

CVSS Temporal Score - 8.4

Exploitability

Remediation Level

Report Confidence

Proof-of-Concept

Unavailable

Confirmed

Impact

Successful exploitation of the vulnerability may result in remote code execution.

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.

Workarounds

General information on ActiveX attacks and mitigation techniques can be found at the following link: http://www.cisco.com/web/about/security/intelligence/actX-ALPI_amiddleton.html

Obtaining Fixed Software

Cisco will release 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 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 malicious use of the vulnerability described in this advisory against any Cisco product.

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. CISCO EXPECTS TO UPDATE THIS DOCUMENT AS NEW INFORMATION BECOMES AVAILABLE.

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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090728-activex

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 1.0

2009-July-28

Initial 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/web/about/security/psirt/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.