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             AUSCERT External Security Bulletin Redistribution

     Cisco Webex Teams Logging Feature Command Execution Vulnerability
                             5 September 2019


        AusCERT Security Bulletin Summary

Product:           Cisco Webex Teams
Publisher:         Cisco Systems
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1939  

Original Bulletin: 

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

Cisco Webex Teams Logging Feature Command Execution Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20190904-webex-teams

First Published: 2019 September 4 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvp30119



CVSS Score:


  o A vulnerability in the Cisco Webex Teams client for Windows could allow an
    unauthenticated, remote attacker to execute arbitrary commands on an
    affected system.

    This vulnerability is due to improper restrictions on software logging
    features used by the application on Windows operating systems. An attacker
    could exploit this vulnerability by convincing a targeted user to visit a
    website designed to submit malicious input to the affected application. A
    successful exploit could allow the attacker to cause the application to
    modify files and execute arbitrary commands on the system with the
    privileges of the targeted user.

    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

    This vulnerability affects all releases of Cisco Webex Teams for Windows
    earlier than Release 3.0.12427.0.

    To determine which Cisco Webex Teams version is running, users can click
    their profile picture, which is between the Home icon and search field in
    the application window. The user can choose Help > About to view the
    release information, which is similar to the following:

        Webex Teams
        Version: 3.0.12808.0

    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 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:

    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 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

    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:

    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

    Fixed Releases

    Cisco fixed this vulnerability in Webex Teams releases 3.0.12427.0 and

    Customers are advised to upgrade to the latest version of Cisco Webex
    Teams. In the left panel of the app, click the Refresh icon (the circular
    green arrow) and then click Update . If the Refresh icon is not present,
    there is no update pending.

    For more information, see the Cisco Webex Teams help article Update the
    Cisco Webex Teams App to the Latest Release .

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 Chew Keong Tan of Bank of America for reporting
    this vulnerability.

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/

Revision History

  o +---------+------------------------+---------+--------+-------------------+
    | Version |      Description       | Section | Status |       Date        |
    | 1.0     | Initial public         | -       | Final  | 2019-September-04 |
    |         | release.               |         |        |                   |

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