Cisco Security Advisory
Cisco Webex Meetings Desktop App for Windows Arbitrary File Overwrite Vulnerability
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CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
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A vulnerability in Cisco Webex Meetings Desktop App for Windows could allow an unauthenticated, remote attacker to overwrite arbitrary files on an end-user system.
The vulnerability is due to improper validation of URL parameters that are sent from a website to the affected application. An attacker could exploit this vulnerability by persuading a user to follow a URL to a website that is designed to submit crafted input to the affected application. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system, possibly corrupting or deleting critical system files.
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-desktop-app-OVSfpVMj
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Vulnerable Products
At the time of publication, this vulnerability affected Cisco Webex Meetings Desktop App for Windows releases earlier than 40.6.9 and 40.8.
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.
Cisco has confirmed that this vulnerability does not affect Cisco Webex Meetings Desktop App for Mac.
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There are no workarounds that address this vulnerability.
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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, Cisco Webex Meetings Desktop App for Windows releases 40.6.9 and later and 40.8 and later contained the fix for this vulnerability.
At the time of publication, Cisco Webex Meeting Server releases 3.0MR3 Security Patch 6 and later and releases 4.0MR3 Security Patch 5 and later contained versions of Cisco Webex Meetings Desktop App for Windows that address this vulnerability.
Administrators can update the Cisco Webex Meetings Desktop App for their user bases by following the instructions available in the IT Administrator Guide for Mass Deployment of the Cisco Webex Meetings Desktop App.
Users can update the Cisco Webex Meetings Desktop App by following the instructions in the Update the Cisco Webex Meetings Desktop App article.
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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.
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This vulnerability was found during internal security testing.
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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.
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Show LessVersion Description Section Status Date 1.2 Added fixed release information for Cisco Webex Meeting Server. Fixed Software Final 2021-FEB-17 1.1 Included vulnerable and fixed release information for previous releases of Cisco Webex Meetings Desktop App for Windows. Vulnerable Products and Fixed Software Final 2020-SEP-02 1.0 Initial public release. - Final 2020-AUG-19
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