Cisco Security Advisory

Vulnerable Products

Products Confirmed Not Vulnerable

The WebEx meeting service is a hosted multimedia conferencing solution that is managed by and maintained by Cisco WebEx. The WebEx Recording Format (WRF) is a file format that is used to store WebEx meeting recordings that have been recorded on the computer of an on-line meeting attendee. The WRF Player is an application that is used to play back and edit WRF files (files with .wrf extensions). The WRF Player can be automatically installed when the user accesses a WRF file that is hosted on a WebEx server (stream playback mode). The WRF Player can also be manually installed after downloading the application from www.webex.com to play back WRF files locally (offline playback mode).

Multiple buffer overflow vulnerabilities exist in the WRF Player. The vulnerabilities may lead to a crash of the WRF Player application, or in some cases, lead to remote code execution.

To exploit a vulnerability, a malicious WRF file would need to be opened by the WRF Player application. An attacker may be able to accomplish this by providing the malicious WRF file directly to users (for example, via e-mail), or by convincing users to visit a malicious website. The vulnerability cannot be triggered by users attending a WebEx meeting.

These vulnerabilities have been assigned the following Common Vulnerabilities and Exposures (CVE) identifiers:

• CVE-2009-2875
  
• CVE-2009-2876
  
• CVE-2009-2877
  
• CVE-2009-2878
  
• CVE-2009-2879
  
• CVE-2009-2880
  

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 .

Multiple Cisco WebEx Player Buffer Overflow Vulnerabilities Calculate the environmental score of <all vulnerabilities in this advisory>
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 - 7.7
Exploitability		Remediation Level		Report Confidence
Functional		Official-Fix		Confirmed

Successful exploitation of the vulnerabilities described in this document could result in a crash of the Cisco WebEx WRF Player application, and in some cases, allow a remote attacker to execute arbitrary code on the targeted system with the privileges of the user running the WRF Player application.

The table below contains "First Fixed" information for the Cisco WebEx WRF Player that is automatically downloaded from a WebEx site when a WRF hosted on a WebEx site is accessed (stream playback mode). Fixes are cumulative within a major release so for example, if release 27.10.1 is fixed, then release 27.10.2 will have the fix too.

Platform	Major Release 26.x	Major Release 27.x
Microsoft Windows	26.49.32; available now except lockdown sites	27.10.x; available now for non-PSO and non-lockdown sites
Mac OS X	26.49.35; available early February 2010	27.11.8; available now for non-PSO and non-lockdown sites
Linux	26.49.35; available early February 2010	27.11.8; available now for non-PSO and non-lockdown sites

PSO and lockdown sites running 27.x will receive the fixes for these vulnerabilities during the next emergency patching (EP) cycle. This advisory will be updated to indicate a specific timeline once one is available.

If the WRF Player was automatically installed, the WebEx WRF Player will be automatically upgraded to the latest, non-vulnerable version when users access a WRF file hosted on a WebEx server.

If the WebEx WRF Player was manually installed, users will need to manually install a new version of the player after downloading the latest version from www.webex.com .

There are no workarounds for the vulnerabilities disclosed in this advisory.

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 that need additional information can contact WebEx Global Support Services and Technical Support. WebEx Global Support Services and Technical Support can be reached through the WebEx support site at http://support.webex.com/support/support-overview.html or by phone at +1-866-229-3239 or +1-408-435-7088.

Customers outside of the United States can reference the following link for local support numbers: http://support.webex.com/support/phone-numbers.html.

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 malicious use of the vulnerabilities described in this advisory.

These vulnerabilities were discovered and reported to Cisco by Xiaopeng Zhang and Zhenhua Liu of Fortinet's FortiGuard Labs. The FortiGuard Labs advisory is available at http://www.fortiguard.com . Cisco would like to thank FortiGuard Labs for reporting these vulnerabilities to us and for working with us on a coordinated disclosure.

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-20091216-webex

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 1.1	2009-December-23	Revised the Vulnerable Products section
Revision 1.0	2009-December-16	Initial public release

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.