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AUSCERT External Security Bulletin Redistribution
ESB-2019.3368
Cisco Webex Teams Logging Feature Command Execution Vulnerability
5 September 2019
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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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190904-webex-teams
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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
CVE-2019-1939
CWE-74
CVSS Score:
7.5 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190904-webex-teams
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.
Workarounds
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:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.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 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.
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:
https://www.cisco.com/c/en/us/support/web/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
Cisco fixed this vulnerability in Webex Teams releases 3.0.12427.0 and
later.
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.
Source
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190904-webex-teams
Revision History
o +---------+------------------------+---------+--------+-------------------+
| Version | Description | Section | Status | Date |
+---------+------------------------+---------+--------+-------------------+
| 1.0 | Initial public | - | Final | 2019-September-04 |
| | release. | | | |
+---------+------------------------+---------+--------+-------------------+
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