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AUSCERT External Security Bulletin Redistribution
ESB-2020.3029
Cisco Webex Meetings Client for Windows, Webex Meetings Desktop App, and
Webex Teams Information Disclosure Vulnerability
3 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Webex Meetings Client for Windows
Webex Meetings Desktop App
Webex Teams
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3541
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-media-znjfwHD6
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Webex Meetings Client for Windows, Webex Meetings Desktop App, and Webex
Teams Information Disclosure Vulnerability
Priority: Medium
Advisory ID: cisco-sa-webex-media-znjfwHD6
First Published: 2020 September 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvu19065
CVE-2020-3541
CWE-200
Summary
o A vulnerability in the media engine component of Cisco Webex Meetings
Client for Windows, Cisco Webex Meetings Desktop App for Windows, and Cisco
Webex Teams for Windows could allow an authenticated, local attacker to
gain access to sensitive information.
The vulnerability is due to unsafe logging of authentication requests by
the affected software. An attacker could exploit this vulnerability by
reading log files that are stored in the application directory. A
successful exploit could allow the attacker to gain access to sensitive
information, which could be used in further attacks.
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-webex-media-znjfwHD6
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products and releases:
Webex Meetings Client for Windows releases earlier than releases
39.5.25 and 40.6.6
Webex Meetings Desktop App for Windows releases earlier than releases
39.5.25 and 40.6.6
Webex Teams for Windows releases earlier than Release 3.0.15711.0
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.
Details
o The affected Cisco Webex Meetings client applications rely on the media
engine component to make audio calls. The component may log Windows NT LAN
Manager (NTLM) authentication exchanges in the application directory.
Attackers with elevated privileges on the local system could access
sensitive information in the stored NTLM exchanges and use that information
in further attacks. Impacts to environments may vary depending on the
information that is exposed.
Systems most at risk are shared user systems that have multiple users who
are logged in and using local applications.
Workarounds
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
providers.
Fixed Releases
At the time of publication, the following releases contained the fix for
this vulnerability:
Cisco Webex Product Fixed Release
Cisco Webex Meetings Client for Windows 40.6.6 and later
Cisco Webex Meetings Client for Windows, 39.5.25 and later
lockdown versions
Cisco Webex Meetings Desktop App for 40.6.6 and later
Windows
Cisco Webex Meetings Desktop App for 39.5.25 and later
Windows, lockdown versions
3.0 MR3 Security Patch 3 and
Cisco Webex Meetings Server later
4.0 MR3 Security Patch 2 and
later
Cisco Webex Teams for Windows 3.0.15711.0 and later
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 This vulnerability was found by Chris Deering of Cisco during internal
security testing.
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-webex-media-znjfwHD6
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-SEP-02 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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