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             AUSCERT External Security Bulletin Redistribution

         Cisco Webex Meetings, Webex Network Recording Player, and
                  Webex Teams DLL Injection Vulnerability
                                3 June 2021


        AusCERT Security Bulletin Summary

Product:           Webex Meetings Desktop App
                   Webex Meetings Server
                   Webex Network Recording Player
                   Webex Teams
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1536  

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Webex Meetings, Webex Network Recording Player, and Webex Teams DLL
Injection Vulnerability

Priority:        Medium
Advisory ID:     cisco-sa-webex-dll-inject-XNmcSGTU
First Published: 2021 June 2 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvw48667 CSCvw79311 CSCvw79321
CVE Names:       CVE-2021-1536
CWEs:            CWE-427


  o A vulnerability in Cisco Webex Meetings Desktop App for Windows, Cisco
    Webex Meetings Server, Cisco Webex Network Recording Player for Windows,
    and Cisco Webex Teams for Windows could allow an authenticated, local
    attacker to perform a DLL injection attack on an affected device. To
    exploit this vulnerability, the attacker must have valid credentials on the
    Windows system.

    This vulnerability is due to incorrect handling of directory paths at run
    time. An attacker could exploit this vulnerability by inserting a
    configuration file in a specific path in the system, which can cause a
    malicious DLL file to be loaded when the application starts. A successful
    exploit could allow the attacker to execute arbitrary code on the affected
    system with the privileges of another user account.

    Cisco has released software updates that address this vulnerability. There
    are no workarounds that address this vulnerability.

    This advisory is available at the following link:

Affected Products

  o Vulnerable Products

    At the time of publication, this vulnerability affected the following Cisco

       Webex Meetings Desktop App for Windows
       Webex Meetings Server
       Webex Network Recording Player for Windows
       Webex Teams for Windows

    For information about which Cisco software releases were vulnerable at the
    time of publication, see the Fixed Software section of this advisory. See
    the Details section in the bug ID(s) at the top of this advisory for the
    most complete and current information.

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.


  o There are no workarounds that address this vulnerability.

Fixed Software

  o When considering software upgrades , customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories page , 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

    Fixed Releases

    At the time of publication, the release information in the following table
    (s) was accurate. See the Details section in the bug ID(s) at the top of
    this advisory for the most complete and current information.

    Customers are advised to upgrade to an appropriate fixed software release
    as indicated in the following table(s):

    Cisco Webex Platform                                First Fixed Release
    Webex Meetings Desktop App for Windows    
    Webex Meetings Server                               3.0 MR4
                                                        4.0 MR4
    Webex Network Recording Player for Windows
    Webex Teams for Windows                   

Exploitation and Public Announcements

  o 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.


  o Cisco would like to thank Xavier Danest of Decathlon for reporting this

Cisco Security Vulnerability Policy

  o 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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-dll-inject-XNmcSGTU

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    | 1.0      | Initial public release.   | -        | Final  | 2021-JUN-02  |

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