ESB-2017.3057.2 - UPDATE [Cisco] Cisco WebEx Meeting Center: Unauthorised access - Remote with user interaction 2017-12-13

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2017.3057.2
                           cisco-sa-20171129-wmc
                             13 December 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco WebEx Meeting Center
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12297  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171129-wmc

Revision History:  December 13 2017: Updated source with fixed and
                                     vulnerable releases
                   November 30 2017: Initial Release

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

Severity: Critical
Advisory ID: cisco-sa-20171129-webex-players
First Published: 2017 November 29 16:00 GMT
Last Updated: 2017 December 12 01:12 GMT
Version 1.4: Final
Workarounds: No workarounds available

Cisco Bug IDs:
CSCve02843 CSCve10584 CSCve10591 CSCve02843 CSCve10584 CSCve10591 CSCve10658
CSCve10744 CSCve10749 CSCve10762 CSCve10764 CSCve11503 CSCve11507 CSCve11532
CSCve11538 CSCve11545 CSCve11548 CSCve30208 CSCve30214 CSCve30268 CSCvf38060
CSCvf38077 CSCvf38084 CSCvf49650 CSCvf49697 CSCvf49707 CSCvf57234 CSCvg54836
CSCvg54843 CSCvg54850 CSCvg54853 CSCvg54856 CSCvg54861 CSCvg54867 CSCvg54868
CSCvg54870 CVE-2017-12367 CVE-2017-12368 CVE-2017-12369 
 
CVE-2017-12367 CVE-2017-12368 CVE-2017-12369 CVE-2017-12370 CVE-2017-12371
CVE-2017-12372 CWE-119 CWE-125 CWE-20

CVSS Score: Base 9.6
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X

CVE-2017-12367 CVE-2017-12368 CVE-2017-12369 CVE-2017-12367 CVE-2017-12368
CVE-2017-12369 CVE-2017-12370 CVE-2017-12371 CVE-2017-12372 CWE-119
CWE-125 CWE-20

Summary

  * Multiple vulnerabilities exist in Cisco WebEx Network Recording Player for
    Advanced Recording Format (ARF) and WebEx Recording Format (WRF) files. A
    remote attacker could exploit these vulnerabilities by providing a user
    with a malicious ARF or WRF file via email or URL and convincing the user
    to launch the file. Exploitation of these vulnerabilities could cause an
    affected player to crash and, in some cases, could allow arbitrary code
    execution 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 by an online meeting attendee.
    The player 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 Meetings sites, Cisco WebEx Meetings Server, and
    Cisco WebEx ARF and WRF Players to address these vulnerabilities. There are
    no workarounds that address these vulnerabilities.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20171129-webex-players

Affected Products

  * Vulnerable Products

    The vulnerabilities disclosed in this advisory affect the Cisco WebEx ARF
    Player and the Cisco WebEx WRF Player. The following client builds of Cisco
    WebEx Business Suite (WBS30, WBS 31, and WBS32), Cisco WebEx Meetings, and
    Cisco WebEx Meetings Server are affected by at least one of the
    vulnerabilities described in this advisory:
      + Cisco WebEx Business Suite (WBS30) client builds prior to T30.20
      + Cisco WebEx Business Suite (WBS31) client builds prior to T31.20
      + Cisco WebEx Business Suite (WBS32) client builds prior to T32.7
      + Cisco WebEx Meetings with client builds prior to T32.7
      + Cisco WebEx Meeting Server builds prior to 2.7MR3
    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 Meeting Center. See the "Fixed Software" section for details.

    Alternatively, version information of the Cisco WebEx meeting client can be
    accessed from within the Cisco WebEx meeting client. Version information
    for the Cisco WebEx meeting client on Windows and Linux platforms can be
    viewed by choosing Help > About Cisco WebEx Meeting Center. Version
    information for the Cisco WebEx meeting client on Mac platforms 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 30.32.16 is fixed, build 30.32.17 will contain
    updated software. Cisco WebEx site administrators have access to secondary
    version nomenclature, for example, T30 SP32 EP 16, which shows that the
    server is running client build 30.32.16.

    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
    Meetings are a hosted multimedia conferencing solution that is managed and
    maintained by Cisco WebEx. The Cisco WebEx Meetings Server is a multimedia
    conferencing solution that customer 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 ARF Player and Cisco WebEx WRF Player can be automatically
    installed when a user accesses a recording file that is hosted on a WebEx
    meeting site (for streaming playback mode). The Cisco WebEx ARF Player and
    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 (WBS30, WBS31, WBS32, and WebEx Meetings) and for Cisco WebEx
    Meetings Server clients. The Cisco WebEx WRF Player is only available for
    Cisco WebEx WBS30, WBS 31, and WBS32 meeting site clients and is not
    available for the Cisco WebEx Meetings 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 ID
    Cisco WebEx Network
    Recording Player        CVE-2017-12367 CSCve11545, CSCve02843, CSCve11548
    Denial of Service
    Vulnerability
    Cisco WebEx Network                    CSCve10584, CSCve10591, CSCve11503,
    Recording Player        CVE-2017-12368 CSCve10658, CSCve11507, CSCve10749,
    Remote Code Execution                  CSCve10744, CSCve11532, CSCve10762,
    Vulnerability                          CSCve10764, CSCve11538
    Cisco WebEx Network
    Recording Player        CVE-2017-12369 CSCve30208, CSCve30214, CSCve30268
    Out-of-Bounds
    Vulnerability
    Cisco WebEx Network
    Recording Player        CVE-2017-12370 CSCvf38060, CSCvg54836, CSCvf38077,
    Remote Code Execution                  CSCvg54843, CSCvf38084, CSCvg54850
    Vulnerability
    Cisco WebEx Network                    CSCvf49650, CSCvg54853, CSCvg54856,
    Recording Player        CVE-2017-12371 CSCvf49697, CSCvg54861, CSCvf49707,
    Remote Code Execution                  CSCvg54867
    Vulnerability
    Cisco WebEx Network
    Recording Player        CVE-2017-12372 CSCvf57234, CSCvg54868, CSCvg54870
    Remote Code Execution
    Vulnerability


    Exploitation of these vulnerabilities may cause player applications to
    crash or, in some cases, execute malicious code from a remote attacker.

    To exploit these vulnerabilities, the player application 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.

Workarounds

  * There are no workarounds that address these vulnerabilities. However, it is
    possible to remove all WebEx software completely from a system using the
    Meeting Services Removal Tool (for Microsoft Windows users) or Mac WebEx
    Meeting Application Uninstaller (for Apple Mac OS X users) available for
    download from the Cisco Collaboration Help for Cisco Spark, WebEx, and
    Jabber article at https://collaborationhelp.cisco.com/article/en-us/
    WBX000026396.  

    Removal of the WebEx software from a Linux or UNIX-based system can be
    accomplished by following the steps in the Cisco Collaboration Help for
    Cisco Spark, WebEx, and Jabber article: https://collaborationhelp.cisco.com
    /article/en-us/WBX28548.

Fixed Software

  * Cisco has released free software updates that address the vulnerability
    described in this advisory. Customers may only install and expect support
    for software versions and feature sets for which they have purchased a
    license. By installing, downloading, accessing, or otherwise using such
    software upgrades, customers agree to follow the terms of the Cisco
    software license:
    http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html

    Additionally, customers may only download software for which they have a
    valid license, procured from Cisco directly, or through a Cisco authorized
    reseller or partner. In most cases this will be a maintenance upgrade to
    software that was previously purchased. Free security software updates do
    not entitle customers to a new software license, additional software
    feature sets, or major revision upgrades.

    When considering software upgrades, customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories and Alerts page, to determine exposure and a
    complete upgrade solution.

    In all cases, customers should ensure that the devices to upgrade 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.

    Customers Without Service Contracts

    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 TAC:
    http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html

    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.

    Fixed Releases

    The following client builds of Cisco WebEx Business Suite (WBS30, WBS31,
    WBS32), Cisco WebEx Meetings, and Cisco WebEx Meetings Server address all
    the vulnerabilities described in this advisory:

      + Cisco WebEx Business Suite (WBS30) client builds T30.20 and later
      + Cisco WebEx Business Suite (WBS31) client builds T31.20 and later
      + Cisco WebEx Business Suite (WBS32) client builds T32.7 and later
      + Cisco WebEx Meetings with client builds T32.7 and later
      + Cisco WebEx Meeting Server builds 2.7MR3 and later, 2.8MR1 and later,
        3.0 and 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 Meeting Center. The Cisco WebEx software updates are cumulative in
    client builds. For example, if client build 30.32.16 is fixed, build
    30.32.17 will contain updated software.

    The vulnerabilities disclosed in this advisory affect the Cisco WebEx ARF
    and WRF 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, non-vulnerable 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.

    NOTE: Users whose WebEx Business Suites are on lockdown will need to
    contact WebEx Support to apply the appropriate patch to their WebEx site.


    Cisco Bug ID                    First Fixed Release
                 WBS30   WBS31   WBS32 WebEx Meetings WebEx Meetings Server
    CSCve11545                                        2.7MR3
                                                      2.8MR1
    CSCve02843   T30.20 T31.14   T32.2                 
    CSCve11548                         T30.20          
                                       T32.2
    CSCve10584          T31.14.4 T32.3                 
                        T31.15
    CSCve10591                                        2.7MR3
                                                      2.8MR1
    CSCve11503                         T32.3           
    CSCve10658          T31.14.4 T32.4                 
    CSCve11507                         T32.3           
    CSCve10749                                        2.7MR3
                                                      2.8MR1
    CSCve10744          T31.14.4 T32.2                 
    CSCve11532                         T32.2           
    CSCve10762                   T32.4                 
    CSCve10764                                        3.0
    CSCve11538                         T32.2           
                        T31.14.4 T32.3
    CSCve30208          T31.15   T32.6                 
                        T31.17.2
    CSCve30214                                        2.7MR3
                                                      2.8MR1
    CSCve30268                         T32.4           
                                       T32.6
    CSCvf38060          T31.17   T32.5                 
    CSCvg54836                         T32.7           
    CSCvf38077          T31.17   T32.5                 
    CSCvg54843                         T32.7           
    CSCvf38084          T31.17   T32.5                 
    CSCvg54850                         T32.7           
    CSCvf49650          T31.20   T32.6                 
    CSCvg54853                                        3.0
    CSCvg54856                         T32.7           
    CSCvf49697          T31.20   T32.6                 
    CSCvg54861                         T32.7           
    CSCvf49707          T31.20   T32.7                 
    CSCvg54867                         T32.7           
    CSCvf57234          T31.17.2 T32.6                 
    CSCvg54868                                        3.0
    CSCvg54870                         T32.7           

Exploitation and Public Announcements

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

Source

  * These vulnerabilities were reported to Cisco by Yihan Lian, Fortinet, and
    Trend Micro as follows:


                    Cisco Bug IDs                            Reporter
    CSCve11545, CSCve02843, CSCve11548,            Yihan Lian of Qihoo 360
    CSCve30208, CSCve30214, CSCve30268             GearTeam
    CSCve10584, CSCve10591, CSCve11503,
    CSCve10658, CSCve11507, CSCve10749,            Kushal Arvind Shah of
    CSCve10744, CSCve11532, CSCve10762,            Fortinet's Fortiguard Team
    CSCve10764, CSCve11538
    CSCvf38077, CSCvg54843, CSCvf38060,            Steven Seeley of Offensive
    CSCvg54836, CSCvf38084, CSCvg54850,            Security working with Trend
    CSCvf49650, CSCvg54853, CSCvg54856,            Micro's Zero Day Initiative
    CSCvf49697, CSCvg54861, CSCvf49707, CSCvg54867
    CSCvf57234, CSCvg54868, CSCvg54870             rgod working with Trend
                                                   Micro's Zero Day Initiative

Cisco Security Vulnerability Policy

  * To learn about Cisco security vulnerability disclosure policies and
    publications, see the Security Vulnerability Policy. This document also
    contains instructions for obtaining fixed software and receiving security
    vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

  * Subscribe

URL

  * https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20171129-webex-players

Revision History

  * 
    +-----------------------------------------------------------------------------+
    | Version |        Description         | Section  | Status |       Date       |
    |---------+----------------------------+----------+--------+------------------|
    | 1.4     | Provided clarity to        | Affected | Final  | 2017-December-12 |
    |         | vulnerable releases.       | Products |        |                  |
    |---------+----------------------------+----------+--------+------------------|
    | 1.3     | Provided clarity to first  | Fixed    | Final  | 2017-November-30 |
    |         | fixed versions.            | Software |        |                  |
    |---------+----------------------------+----------+--------+------------------|
    |         | Updated researcher's       |          |        |                  |
    | 1.2     | information in the Source  | Source   | Final  | 2017-November-30 |
    |         | section.                   |          |        |                  |
    |---------+----------------------------+----------+--------+------------------|
    |         | Corrected a bug ID listed  |          |        |                  |
    | 1.1     | in the Details section for | Details  | Final  | 2017-November-29 |
    |         | CVE-2017-12370.            |          |        |                  |
    |---------+----------------------------+----------+--------+------------------|
    | 1.0     | Initial public release.    | ?        | Final  | 2017-November-29 |
    +-----------------------------------------------------------------------------+
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