Summary

• 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-media-znjfwHD6

Affected Products

• 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

• 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

• There are no workarounds that address this vulnerability.

Fixed Software

• 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, lockdown versions	39.5.25 and later
  Cisco Webex Meetings Desktop App for Windows	40.6.6 and later
  Cisco Webex Meetings Desktop App for Windows, lockdown versions	39.5.25 and later
  Cisco Webex Meetings Server	3.0 MR3 Security Patch 3 and 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

• 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

• This vulnerability was found by Chris Deering of Cisco during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-media-znjfwHD6

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2020-SEP-02

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