Summary

• A vulnerability in Cisco Webex Meetings Desktop App for Windows could allow an authenticated, local attacker to gain access to sensitive information on an affected system.

  The vulnerability is due to unsafe usage of shared memory that is used by the affected software. An attacker with permissions to view system memory could exploit this vulnerability by running an application on the local system that is designed to read shared memory. A successful exploit could allow the attacker to retrieve sensitive information from the shared memory, including usernames, meeting information, or authentication tokens that could aid the attacker in future 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-client-NBmqM9vt

Affected Products

• Vulnerable Products

  At the time of publication, this vulnerability affected Cisco Webex Meetings Desktop App for Windows releases earlier than 41.2.

  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

• Cisco Webex Meetings Desktop App uses shared memory to exchange information with the Windows operating system and other applications. The software may store sensitive information-such as usernames, meeting information, and authentication tokens-in this shared memory space. Other users on the local system could retrieve this information from within the shared memory space and use it for additional attacks.

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 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.

  Fixed Releases

  At the time of publication, the following releases contained the fix for this vulnerability:

  Cisco Webex Product	Fixed Release
  Cisco Webex Meetings Desktop App for Windows	41.2 and later
  Cisco Webex Meetings Desktop App for Windows, lockdown versions	39.5.26 and later
  Cisco Webex Meetings Server	3.0 MR3 Security Patch 3 and later 4.0 MR3 Security Patch 2 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 aware that proof-of-concept exploit code is available for the vulnerability that is described in this advisory.

  The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.

Source

• Cisco would like to thank Martin Rakhmanov of Trustwave for reporting this vulnerability.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-client-NBmqM9vt

Revision History

• Version	Description	Section	Status	Date
  1.5	Updated vulnerable releases and fixed releases.	Vulnerable Products, Fixed Software	Final	2021-MAY-05
  1.4	Added Cisco bug ID for Cisco Webex Meetings Server.	-	Final	2020-JUL-10
  1.3	Added update information for Cisco Webex Meetings Server.	Fixed Software	Final	2020-JUL-07
  1.2	Included additional fix information for the Cisco Webex Desktop App release 40.4.12.	Vulnerable Products, Fixed Software	Final	2020-JUN-23
  1.1	Clarified affected versions of Cisco Webex Meetings Desktop App for Windows.	Affected Products	Final	2020-JUN-17
  1.0	Initial public release.	-	Final	2020-JUN-17

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