Cisco Security Advisory

Multiple Vulnerabilities in the Cisco WebEx Recording Format and Advanced Recording Format Players

Advisory ID: cisco-sa-20130904-webex

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130904-webex

Revision 1.0

For Public Release 2013 September 4 16:00  UTC (GMT)


Summary

Multiple buffer overflow vulnerabilities exist in the Cisco WebEx Recording Format (WRF) and Advanced Recording Format (ARF) Players. Exploitation of these vulnerabilities could allow a remote attacker to crash an affected player, and in some cases, 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.

Cisco has updated affected versions of the Cisco WebEx Business Suite meeting sites, Cisco WebEx 11 meeting sites, Cisco WebEx Meetings Server, and Cisco WebEx WRF and ARF Players to address these vulnerabilities.

Cisco has released free software updates that address these vulnerabilities. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130904-webex

Affected Products


Vulnerable Products

The vulnerabilities disclosed in this advisory affect the Cisco WebEx WRF Player and the Cisco WebEx ARF Player. The following client builds of Cisco WebEx Business Suite (WBS27 and WBS28), Cisco WebEx 11, and Cisco WebEx Meetings Server are affected by at least one of the vulnerabilities described in this advisory:
  • Cisco WebEx Business Suite (WBS28) client builds prior to T28.8 (28.8)
  • Cisco WebEx Business Suite (WBS27) client builds prior to T27LDSP32EP16 (27.32.16)
  • Cisco WebEx 11 versions prior to 1.2 SP6 (1.2.6.0) with client builds prior to T28.8 (28.8)
  • Cisco WebEx Meetings Server client builds prior to T27L10NSP32_ORION111
To determine whether a Cisco WebEx meeting site is running an affected version of the WebEx client build, users can log in to their Cisco WebEx meeting site 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.

Alternatively, version information of the Cisco WebEx Meeting client can be accessed from within the Cisco WebEx Meeting client. To determine version information of the Cisco WebEx meeting client on Windows and Linux platforms, it can be viewed by choosing Help > About Cisco WebEx Meeting Center to determine version information of the Cisco WebEx meeting client on Mac platforms, it can be viewed by choosing Meeting Center > About Cisco WebEx Meeting Center.

The Cisco WebEx software updates are cumulative in client builds. For example, if client build 27.32.16 is fixed, build 27.32.17 will contain updated software; Cisco WebEx site administrators have access to secondary version nomenclature, for example, T27 SP32 EP16. The example shows the server is running client build 27.32.16.

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 Cisco WebEx Business Suite (WBS) meeting services and Cisco WebEx 11 are hosted multimedia conferencing solutions that are managed and maintained by Cisco WebEx. The Cisco WebEx Meetings Server is a multimedia conferencing solution that customers can host in their private clouds.

The ARF and WRF file formats are 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 ARF Player and the Cisco WebEx WRF Player are applications that are used to play back and edit WebEx ARF and WRF recording files (files with .arf and .wrf extensions).

The Cisco WebEx WRF Player and Cisco WebEx ARF 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 ARF Player and 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 for offline playback.

The Cisco WebEx ARF player is available for all Cisco WebEx meeting site clients (WBS27, WBS28 and WebEx11) and for Cisco WebEx Meetings Server clients. The Cisco WebEx WRF Player is only available for Cisco WebEx WBS 27 and WBS28 meeting site clients and is not available for the Cisco WebEx 11 or Cisco WebEx Meetings Server clients.

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 IDs
Cisco WebEx ARF Player Memory Corruption Vulnerability
CVE-2013-1115 CSCue74118, CSCub28371, CSCud23401 and CSCud31109 
Cisco WebEx ARF Player Heap Corruption Vulnerability
CVE-2013-1116
CSCue74147 and CSCub28383
Cisco WebEx WRF Player Exception Handler Corruption Vulnerability CVE-2013-1117 CSCuc27639
Cisco WebEx WRF Player Stack Buffer Overflow Vulnerability
CVE-2013-1118
CSCuc27645
Cisco WebEx WRF Player JPEG DHT Index Memory Corruption Vulnerability CVE-2013-1119 CSCuc24503

Exploitation of these vulnerabilities may cause player applications to crash or, in some cases, remote code execution could occur.

To exploit one of these vulnerabilities, the player applications would need to open a malicious ARF or WRF file. An attacker may be able to accomplish this exploit by providing the malicious recording file directly to users (for example, by using email), or by directing a user to a malicious web page. The vulnerabilities cannot be triggered by users who are attending a WebEx meeting.

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


Cisco WebEx ARF Player Memory Corruption Vulnerability
CSCue74118, CSCub28371, CSCud23401 and CSCud31109

Calculate the environmental score of CSCue74118, CSCub28371, CSCud23401 and CSCud31109

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





Cisco WebEx ARF Player Heap Corruption Vulnerability
CSCue74147 and CSCub28383

Calculate the environmental score of CSCue74147 and CSCub28383

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





Cisco WebEx WRF Player Exception Handler Corruption Vulnerability
CSCuc27639

Calculate the environmental score of CSCuc27639

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





Cisco WebEx WRF Player Stack Buffer Overflow Vulnerability
CSCuc27645

Calculate the environmental score of CSCuc27645

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







Cisco WebEx WRF Player JPEG DHT Index Memory Corruption Vulnerability
CSCuc24503

Calculate the environmental score of CSCuc24503

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

Impact

Successful exploitation of the vulnerabilities described in this document could cause player applications 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 player applications.

Software Versions and Fixes

When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices 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, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

The following client builds of Cisco WebEx Business Suite (WBS27 and WBS28) and Cisco WebEx 11 correct the vulnerabilities described in this advisory:
  • Cisco WebEx Business Suite (WBS28) client builds T28.8 (28.8) or later
  • Cisco WebEx Business Suite (WBS27) client builds 27.32.16 (T27LDSP32EP16) or later
  • Cisco WebEx 11 1.2.6.0 (1.2 SP6) builds T28.8 (28.8) or later
Client builds of the Cisco WebEx Business Suite prior to T27 SP32 have reached end of support; to obtain fixed software please upgrade to the latest version.

The following client builds of Cisco WebEx Meetings Server correct the vulnerabilities described in this advisory:
  • Cisco WebEx Meetings Server client builds T27L10NSP32_ORION111 or later
To determine whether a Cisco WebEx meeting site is running an affected version of the WebEx client build, users can log in to their Cisco WebEx meeting site 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. The Cisco WebEx software updates are cumulative in client builds. For example, if client build 27.32.16 is fixed, build 27.32.17 will contain updated software.

The vulnerabilities disclosed in this advisory affect the Cisco WebEx WRF and ARF players. The Microsoft Windows, Apple Mac OS X, and Linux versions of the players are all affected by at least one vulnerability described in this advisory. If the Cisco WebEx ARF Player or 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 ARF Player or the Cisco WebEx WRF Player was manually installed, users will need to manually install a new version of the player after downloading the latest version from http://www.webex.com/play-webex-recording.html.

Users can manually verify the installed version of the Cisco WebEx ARF Player or the Cisco WebEx WRF Player to determine whether they are affected by these vulnerabilities. To do so, an administrator must examine the version numbers of the installed files and determine whether the version of the file contains the fixed code. Detailed instructions on how to verify the version numbers are provided in the following sections.

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.

Product Client Build Cisco DLL Filename DLL File Versions
WBS27 27.32.16 Atas32_Lite.dll
1027,1232,1016,2201
WBS27 27.32.16 atpdmod.dll
2029.1232.1116.2300
WBS27 27.32.16 atas32.dll 1027,1232,1016,2200
WBS27 27.32.16 atjpg60.dll
1027,1232,1016,2200
WBS27 27.32.16 atdl2006.dll 1027,1232,1016,2200
WBS27 27.32.16 atprtsc.dll
2029.1232.1116.2300
WBS27 27.32.16 atprtses.dll
2029.1232.1116.2300
WBS27 27.32.16 nbrpd.dll 2029.1232.1116.2300
WBS28 28.8 atas32_lite.dll 28,0800,0112,1105
WBS28 28.8 atas32.dll 28,0800,0012,1105
WBS28 28.8 atdl2006.dll 1028,1208,1100,0500
WBS28 28.8 atjpg60.dll 2028,1208,1100,500
WBS28 28.8 atpdmod.dll 2028.1208.1100.2300
WBS28 28.8 atprtsc.dll 2028.1208.1100.2300
WBS28 28.8 atprtses.dll 2028.1208.1100.2300
WBS28 28.8 nbrpd.dll 2028.1208.1100.2300
Cisco WebEx 11 28.8 atas32_lite.dll 28,0800,0012,1105
Cisco WebEx 11 28.8 atas32.dll 28,0800,0012,1105
Cisco WebEx 11 28.8 atdl2006.dll 1028,1208,1100,0500
Cisco WebEx 11 28.8 atjpg60.dll 2028,1208,1100,500
Cisco WebEx 11 28.8  atpdmod.dll 2028.1208.1100.2300
Cisco WebEx 11 28.8 atprtsc.dll 2028.1208.1100.2300
Cisco WebEx 11 28.8 atprtses.dll 2028.1208.1100.2300
Cisco WebEx 11 28.8 nbrpd.dll 2028.1208.1100.2300
Cisco WebEx Meetings Server T27L10NSP32_ORION111 atpdmod.dll 2029.1332.400.1703
Cisco WebEx Meetings Server T27L10NSP32_ORION111 nbrpd.dll 2029.1332.400.1703
Cisco WebEx Meetings Server T27L10NSP32_ORION111 pdcvt.dll 2029.1332.400.1703
Cisco WebEx Meetings Server T27L10NSP32_ORION111 atprtses.dll 2029.1332.400.1703
Cisco WebEx Meetings Server T27L10NSP32_ORION111 atprtsc.dll 2029.1332.400.1703

Apple Mac OS X

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, select 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.

Product Client Build Cisco DLL Filename DLL File Version
WBS27 27.32.16 as.bundle 1210.24.2732.16
WBS27 27.32.16 asplayback.bundle 1210.24.2732.16
WBS27 27.32.16 atas.bundle 1210.24.2732.16
WBS27 27.32.16 nbrpd.bundle 1211.15.2732.16
WBS27 27.32.16 pd.bundle 1211.15.2732.16
WBS28 28.8 as.bundle 1211.5.2808.0
WBS28 28.8 asplayback.bundle 1211.5.2808.0
WBS28 28.8 atas.bundle 1211.5.2808.0
WBS28 28.8 nbrpd.bundle 1211.20.2808.0
WBS28 28.8 pd.bundle 1211.20.2808.0
Cisco WebEx 11 28.8< as.bundle 1211.5.2808.0
Cisco WebEx 11 28.8 asplayback.bundle 1211.5.2808.0
Cisco WebEx 11 28.8 atas.bundle 1211.5.2808.0
Cisco WebEx 11 28.8 nbrpd.bundle 1211.5.2808.0
Cisco WebEx 11 28.8 pd.bundle 1211.5.2808.0
Cisco WebEx Meetings Server T27L10NSP32_ORION111 nbrpd.bundle 1308.01.2732.202

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. There is no entry in the following table for the Cisco WebEx Meetings Server, as the product does not support Linux clients.

Product Client Build Cisco DLL File Name DLL File Version
WBS27 27.32.16 libatdv.so 922700067
WBS27 27.32.16 libnbrdv.so 1.0.27.23
WBS27 27.32.16 NBR Player AS 1.29.27.23
WBS27 27.32.16 WRF player AS 1.29.27.28
WBS28 28.8 libatdv.so 922800010
WBS28 28.8 libnbrdv.so 1.0.28.19
WBS28 28.8 NBR Player AS 1.0.28.18
WBS28 28.8 WRF player AS 1.0.28.19
Cisco WebEx 11 28.8 libatdv.so 922800010
Cisco WebEx 11 28.8 libnbrdv.so 1.0.28.19
Cisco WebEx 11 28.8 NBR Player AS 1.0.28.19
Cisco WebEx 11 28.8 WRF player AS 1.0.28.19

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 OS X 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

This section applies to vulnerabilities in the Cisco WebEx Meetings Server product, and the Cisco WebEx Business Suite services.

Cisco has updated affected versions of the Cisco WebEx WRF and ARF Players to address these vulnerabilities. The majority of Cisco WebEx Business Suite (WBS27 and WBS28) services 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. All Cisco WebEx 11 services customers received these updates automatically.

Cisco has released free software updates to the Cisco WebEx Meetings Server that address the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

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 feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.

Customers with Service Contracts

This section only applies to vulnerabilities in the Cisco WebEx Meetings Server product.

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers Using Third-Party Support Organizations

This section only applies to vulnerabilities in the Cisco WebEx Meetings Server product.

Customers with Cisco products that 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 organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

This section only applies to vulnerabilities in the Cisco WebEx Meetings Server product.

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
  • +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 the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.

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 described in this advisory.

These vulnerabilities were reported to Cisco by iDefense and Microsoft Vulnerability Research (MSVR) as follows:


Vulnerability
Reporter
Cisco WebEx ARF Player Memory Corruption Vulnerability
MSVR
Cisco WebEx ARF Player Heap Corruption Vulnerability
MSVR
Cisco WebEx WRF Player Exception Handler Corruption Vulnerability
MSVR
Cisco WebEx WRF Player Stack Buffer Overflow Vulnerability
MSVR
Cisco WebEx WRF Player JPEG DHT Index Memory Corruption Vulnerability iDefense

Cisco would like to thank these researchers for reporting these vulnerabilities to us, and for working with us towards coordinated disclosure of the 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 Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130904-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 2013-September-04 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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