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Cisco Security Advisory

Multiple Vulnerabilities in the Cisco WebEx Recording Format Player

Advisory ID: cisco-sa-20121010-webex

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20121010-webex

Revision 1.0

For Public Release 2012 October 10 16:00  UTC (GMT)

Related Resources:

View related Alert

Summary

The Cisco WebEx Recording Format (WRF) player contains six buffer overflow vulnerabilities. In some cases, exploitation of the vulnerabilities could allow a remote attacker to execute arbitrary code on the system with the privileges of a targeted user. 

The Cisco WebEx WRF Player is an application used to play back WRF WebEx meeting recordings that have been recorded on a WebEx meeting site or on the computer of an online meeting attendee. The Cisco WebEx WRF Player can be automatically installed when the user accesses a recording file that is hosted on a WebEx meeting site. The Cisco WebEx WRF Player can also be manually installed for offline playback after downloading the application from http://www.webex.com/play-webex-recording.html.

If the Cisco WebEx WRF 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 meeting site. If the Cisco WebEx WRF Player was manually installed, users will need to manually install a new version of the Cisco WebEx WRF Player after downloading the latest version from http://www.webex.com/play-webex-recording.html.

Cisco has updated affected versions of the WebEx meeting sites and Cisco WebEx WRF Player to address these vulnerabilities. 

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20121010-webex

Affected Products


Vulnerable Products

The vulnerabilities disclosed in this advisory affect the Cisco WebEx WRF Player. The following client builds of Cisco WebEx Business Suite (WBS 27 and WBS 28) are affected by at least one of the vulnerabilities that are described in this advisory:
  • T28 client builds prior to T28.4 (28.4)
  • T27 client builds prior to T27LDSP32EP10 (27.32.10)
To determine the WebEx client build, users can log in to their Cisco WebEx meeting site and navigate to the Support > Downloads section via the links on the left side of the page. The version of the WebEx client build will be displayed on the right side of the page. Cisco WebEx software updates are cumulative in client builds. For example, if client build 27.32.10 is fixed, build 27.32.11 will also contain the software update. Cisco WebEx site administrators have access to secondary version nomenclature, such as T27 SP32 EP10. Such an example indicates that the server is running client build 27.32.10.

Note: Customers who do not receive automatic software updates may be running versions of Cisco WebEx that have reached end of software maintenance and should contact customer support.

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 file format is used to store WebEx meeting recordings that have been recorded on a WebEx meeting site or on the computer of an online meeting attendee. The Cisco WebEx WRF Player is the application used to play back and edit WebEx WRF recording files, which use the .wrf extension. The Cisco WebEx WRF Player can be automatically installed when the user accesses a recording file that is hosted on a WebEx meeting site (for stream playback mode). The Cisco WebEx WRF Player can also be manually installed after downloading the application from http://www.webex.com/play-webex-recording.html to play back recording files locally (for offline playback mode).

The following table provides the Cisco bug IDs and Common Vulnerabilities and Exposures (CVE) identifiers that have been assigned for the vulnerabilities in this advisory:

Title
CVE ID
Cisco Bug ID
Cisco WebEx Recording Format Player Buffer Overflow Vulnerability CVE-2012-3936
CSCua40962
Cisco WebEx Recording Format Player Buffer Overflow Vulnerability CVE-2012-3937
CSCtz72967
Cisco WebEx Recording Format Player Buffer Overflow Vulnerability CVE-2012-3938
CSCtz73583
Cisco WebEx WRF Player Memory Corruption Vulnerability CVE-2012-3939
CSCua61331
Cisco WebEx Recording Format Player Buffer Overflow Vulnerability CVE-2012-3940
CSCtz72958
Cisco WebEx Recording Format Player Heap Overflow Vulnerability
CVE-2012-3941
CSCtz72850

Exploitation of the vulnerabilities may cause the Cisco WebEx WRF Player application to crash or, in some cases, result in remote code execution.

To exploit one of these vulnerabilities, the Cisco WebEx WRF Player application must open a malicious WRF 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. Users who are attending a WebEx meeting cannot trigger the vulnerabilities.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:

http://intellishield.cisco.com/security/alertmanager/cvss




CSCtz72967: Cisco WebEx Recording Format Player Buffer Overflow Vulnerability

Calculate the environmental score of CSCtz72967

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




CSCua40962: Cisco WebEx Recording Format Player Buffer Overflow Vulnerability

Calculate the environmental score of CSCua40962

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 - 7.3

Exploitability

Remediation Level

Report Confidence

Proof-of-Concept

Official-Fix

Confirmed




CSCtz73583: Cisco WebEx Recording Format Player Buffer Overflow Vulnerability

Calculate the environmental score of CSCtz73583

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




CSCua61331: Cisco WebEx WRF Player Memory Corruption Vulnerability

Calculate the environmental score of CSCua61331

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




CSCtz72958: Cisco WebEx Recording Format Player Buffer Overflow Vulnerability

Calculate the environmental score of CSCtz72958

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




CSCtz72850: Cisco WebEx Recording Format Player Heap Overflow Vulnerability

Calculate the environmental score of CSCtz72850

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


Impact

Successful exploitation of the vulnerabilities that are described in this document could cause the Cisco WebEx WRF Player application to crash 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 Cisco WebEx WRF Player application.


Software Versions and Fixes

When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm 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 providers.

The following client builds of Cisco WebEx Business Suite (WBS 27 and WBS 28) correct the vulnerabilities described in this advisory:

  • Client builds 28.4 (T28.4)
  • Client builds 27.32.10 (T27LDSP32EP10)

Client builds prior to T27 SP32 have reached end of support; to obtain fixed software please upgrade to the latest version.

To determine the WebEx client build, users can log in to their Cisco WebEx meeting site and navigate to the Support > Downloads section via the links on the left side of the page. The version of the WebEx client build will be displayed on the right side of the page. Cisco WebEx software updates are cumulative in client builds. For example, if client build 27.32.10 is fixed, build 27.32.11 will also contain the software update.

The Microsoft Windows, Apple Mac OS X, and Linux versions of the Cisco WebEx WRF Player are all affected. If the Cisco WebEx WRF 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 meeting site. If the Cisco WebEx WRF Player was manually installed, users must download the latest version from http://www.webex.com/play-webex-recording.html and install it. 

Users can determine whether a Cisco WebEx WRF Player is affected by these vulnerabilities by manually verifying the installed version. To do so, users can examine the file version and determine whether it contains the fixed code.

Microsoft Windows

Five dynamic link libraries (DLLs) were updated on the Microsoft Windows platform to address the vulnerabilities that are described in this advisory. These files are in the C:\Program Files\WebEx\Record Playback folder or the C:\Program Files (x86)\Webex\Record Player folder. The version number of a DLL can be obtained by browsing the Record Playback directory in Windows Explorer, right-clicking the filename, and choosing Properties. The Version or Details tab of the Properties page provides details on the library version. The following table provides the first fixed version for each DLL. If the installed versions are equal to or greater than the versions provided in the table, the system is not vulnerable.

Client Build Cisco DLL Filename DLL File Versions
28.4 atas32.dll
28,400,12,629
28.4 atas32_lite.dll
28,400,112,629
28.4 atrecply.dll
2028,1204,600,700
28.4 atrpui.dll
2028,1204,700,1300
28.4 atdl2006
1028,1204,500,2400
27.32.10 atas32.dll
2,6,32,4
27.32.10
atas32_lite.dll
2,6,32,104
27.32.10
atrecply.dll
2027,1232,610,2600
27.32.10
atrpui.dll
2027,1232, 610,2600
27.32.10
atdl2006
1027,1232,710,1200

Apple Mac

Four package bundles were updated on the Apple Mac OS platform to address the vulnerabilities that are described in this advisory. This file is in each user's home directory and can be accessed from ~/Library/Application Support/WebEx Folder/924. The version can be obtained by browsing to the appropriate folder in Finder and control-clicking the filename. When the menu is displayed, choose show package contents and then double-click the Info.plist file. The version number is shown at the bottom of the displayed table. The following table provides the first fixed version for each package bundle. If the installed versions are equal to or greater than the versions provided in the table, the system is not vulnerable.

Client Build Cisco Bundle Filename Bundle File Versions
28.4 atas.bundle
1207,25,2804,0
28.4
asplayback.bundle
1206,26,2804,0
28.4
as.bundle
1206,29,2804,0
28.4 WebEx Player.app 1206,20,2804,0
27.32.10 atas.bundle
1206.28.2732.10
27.32.10 asplayback.bundle  1206.28.2732.10
27.32.10 as.bundle
1206.28.2732.10 
27.32.10 WebEx Player.app
1206.28.2732.10

Linux

Three shared objects were updated on the Linux platform to address the vulnerabilities that are described in this advisory. These files are in the ~/.webex directory. The version number of the shared objects can be obtained by performing a directory listing with the ls command. The version number is provided after the .so extension. The following table provides the first fixed version for each shared object. If the installed versions are equal to or greater than the versions provided in the table, the system is not vulnerable.

Client Build Cisco Shared Object Filename Shared Object File Versions
28.4 atascli.so
1,0,28,18
28.4 libnbrascli.so
1.0.28.17
28.4 atascli.so (used by meeting client)
922800025
27.32.10 atascli.so
1.29.27.27
27.32.10 libnbrascli.so
1.29.27.22
27.32.10 atascli.so (used by meeting client)
922729007

Workarounds

While there are no workarounds for the vulnerabilities detailed in this advisory, it is possible to remove all WebEx software completely from a system using the Meeting Services Removal Tool (for Microsoft Windows users) or Mac Cisco-WebEx Uninstaller (for Apple Mac users) available at http://support.webex.com/support/downloads.html. Removal of WebEx software from a Linux or UNIX-based system can be accomplished by following the steps in the WebEx knowledge base help article at the following link: https://support.webex.com/MyAccountWeb/knowledgeBase.do?root=Tools&parent=Knowledge&articleId=WBX28548&txtSearchQuery=uninstall%20linux#.

Obtaining Fixed Software

Cisco has updated affected versions of the Cisco WebEx WRF Player to address these vulnerabilities. The majority of customers received these updates automatically. Customers who did not receive the recent security update can contact their Customer Success representative to begin planning an upgrade.

If you have questions, require additional support, or would like to provide feedback or discuss the latest release, Cisco WebEx Global Support Services and Technical Support can be reached at http://support.webex.com/support/support-overview.html or by phone at +1-866-229-3239 or +1-408-435-7088. If you are located outside the United States, please visit http://support.webex.com/support/phone-numbers.html for local support numbers.

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

This section does not apply to vulnerabilities in Cisco WebEx products.


Customers Using Third-Party Support Organizations

This section does not apply to vulnerabilities in Cisco WebEx products.

Customers Without Service Contracts

This section does not apply to vulnerabilities in Cisco WebEx products.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

These vulnerabilities were reported to Cisco by Beyond Security, Core Security, Codenomicon, and TELUS.

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 Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20121010-webex

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

  • 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

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.


Revision History

Revision 1.0 2012-October-10 Initial public release

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.


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