-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Cisco Security Advisory: Multiple Cisco WebEx Player Vulnerabilities Advisory ID: cisco-sa-20110201-webex Revision 1.0 For Public Release 2011 February 1 1600 UTC (GMT) +--------------------------------------------------------------------- Summary ======= Multiple buffer overflow vulnerabilities exist in the Cisco WebEx Recording Format (WRF) and Advanced Recording Format (ARF) Players. In some cases, exploitation of the vulnerabilities could allow a remote attacker to execute arbitrary code on the system of a targeted user. The Cisco WebEx Players are applications that are used to play back WebEx meeting recordings that have been recorded on the computer of an on-line meeting attendee. The players can be automatically installed when the user accesses a recording file that is hosted on a WebEx server. The player can also be manually installed for offline playback after downloading the application from www.webex.com If the WebEx recording player was automatically installed, it will be automatically upgraded to the latest, non-vulnerable version when users access a recording file that is hosted on a WebEx server. If the WebEx recording 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 Cisco has released free software updates that address these vulnerabilities. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20110201-webex.shtml. Affected Products ================= Vulnerable Products +------------------ The vulnerabilities disclosed in this advisory affect the Cisco WebEx recording players. Microsoft Windows, Apple Mac OS X, and Linux versions of the player are all affected. Affected versions of the players are those prior to client builds T27LC SP22 and T27LB SP21 EP3. Customers who have contractual agreements that prevent WebEx from automatically upgrading a recording player to the latest version should contact their account manager to determine upgrade options. To determine whether a Cisco WebEx server is running an affected version of the WebEx client build, users can log in to their Cisco WebEx server and go to the Support > Downloads section. The version of the WebEx client build will be displayed on the right side of the page under "About Support Center." See "Software Versions and Fixes" for details. Cisco recommends that users upgrade to the most current version of the player that is available from www.webex.com/downloadplayer.html Products Confirmed Not Vulnerable +-------------------------------- No other Cisco products are currently known to be affected by these vulnerabilities. Details ======= The WebEx meeting service is a hosted multimedia conferencing solution that is managed and maintained by Cisco WebEx. The WRF and ARF file formats are used to store WebEx meeting recordings that have been recorded on the computer of an on-line meeting attendee. The players are applications that are used to play back and edit recording files (files with .wrf and .arf extensions). The recording players can be automatically installed when the user accesses a recording file that is hosted on a WebEx server (for stream playback mode). The recording players can also be manually installed after downloading the application from www.webex.com/downloadplayer.html to play back recording files locally (for offline playback mode). Multiple buffer overflow vulnerabilities exist in the WRF and ARF players. The vulnerabilities may lead to a crash of the player application or, in some cases, remote code execution could occur. To exploit one of these vulnerabilities, the player application would need to open a malicious WRF or ARF file. An attacker may be able to accomplish this exploit by providing the malicious recording file directly to users (for example, by using e-mail) or by directing a user to a malicious web page. The vulnerability cannot be triggered by users who are attending a WebEx meeting. These vulnerabilities have been assigned the following Common Vulnerabilities and Exposures (CVE) identifiers: * CVE-2010-3269 * CVE-2010-3041 * CVE-2010-3042 * CVE-2010-3043 * CVE-2010-3044 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 * Multiple Cisco WebEx Player Buffer Overflow Vulnerabilities CVSS Base Score - 9.3 Access Vector - Network Access Complexity - Medium Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete CVSS Temporal Score - 7.7 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed Impact ====== Successful exploitation of the vulnerabilities described in this document could result in a crash of the Cisco WebEx ARF Player or WRF Player application and, in some cases, allow a remote attacker to execute arbitrary code on the system with the privileges of the user who is running the recording player application. 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. These vulnerabilities are first fixed in T27LC SP22 and T27LB SP21 EP3. For customers who are running T27LC SP22, the client build will be represented as 27.22SP.0.9253. The fix for customers who are running T27LB SP21 will be deployed by WebEx over the next few weeks. The client build will be determined after the software is deployed. The client build is listed in the Support > Downloads section of the WebEx page after a user authenticates. WebEx bug fixes are cumulative in a major release. For example, if release 27.22SP.0 is fixed, release 27.22SP.1 will also have the software fix. If a recording player was automatically installed, it will be automatically upgraded to the latest, nonvulnerable version when users access a recording file that is hosted on a WebEx server. If a WebEx recording 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/downloadplayer.html Workarounds =========== There are no workarounds for the vulnerabilities disclosed in this advisory. 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/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. Exploitation and Public Announcements ===================================== The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. These vulnerabilities were either found during internal testing or reported to Cisco by a variety of sources, including Core Security, TippingPoint, and Fortinet's FortiGuard Labs. Cisco would like to thank these organizations for reporting these vulnerabilities. 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-20110201-webex.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 | 2011-Feb-01 | 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. +-------------------------------------------------------------------- Copyright 2010-2011 Cisco Systems, Inc. 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