Exposure of Resource to Wrong Sphere in Zoom Workplace Desktop App for Windows and Zoom Workplace Desktop App for Linux - CVE-2021-28133
Published: March 22, 2021 / Updated: May 24, 2022
Vulnerability identifier: #VU51622
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-28133
CWE-ID:
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists within the screen lock functionality due to the way the Zoom client for Windows and Linux handles screen sharing. When a user shares a specific application window via the Share Screen
functionality, other meeting participants can briefly see contents of
other application windows that were explicitly not shared.
Affected software
Zoom Workplace Desktop App for Windows
Zoom Workplace Desktop App for Linux
Zoom Workplace Desktop App for Linux
How to mitigate CVE-2021-28133
Install update from vendor's website.
Zoom Workplace Desktop App for Windows - update to 5.6.0 589
Zoom Workplace Desktop App for Linux - update to 5.5.4 7938.0228
Zoom Workplace Desktop App for Linux - update to 5.5.4 7938.0228
External References
- http://seclists.org/fulldisclosure/2021/Mar/48
- https://thehackernews.com/2021/03/new-zoom-screen-sharing-bug-lets-other.html
- https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-044.txt
- https://www.syss.de/pentest-blog/syss-2020-044-sicherheitsproblem-in-screen-sharing-funktionalitaet-von-zoom-cve-2021-28133
- https://www.youtube.com/watch?v=SonmmgQlLzg
- https://zoom.us/trust/security/security-bulletin