Vulnerability Description
Zoom through 5.5.4 sometimes allows attackers to read private information on a participant's screen, even though the participant never attempted to share the private part of their screen. 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. The contents of these other windows can (for instance) be seen for a short period of time when they overlay the shared window and get into focus. (An attacker can, of course, use a separate screen-recorder application, unsupported by Zoom, to save all such contents for later replays and analysis.) Depending on the unintentionally shared data, this short exposure of screen contents may be a more or less severe security issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zoom | Zoom | <= 5.5.4 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.03Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Mar/48Third Party Advisory
- https://thehackernews.com/2021/03/new-zoom-screen-sharing-bug-lets-other.htmlThird Party Advisory
- https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-044.tThird Party Advisory
- https://www.syss.de/pentest-blog/syss-2020-044-sicherheitsproblem-in-screen-sharThird Party Advisory
- https://www.youtube.com/watch?v=SonmmgQlLzgThird Party Advisory
- https://zoom.us/trust/security/security-bulletinVendor Advisory
- http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.03Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Mar/48Third Party Advisory
- https://thehackernews.com/2021/03/new-zoom-screen-sharing-bug-lets-other.htmlThird Party Advisory
- https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-044.tThird Party Advisory
- https://www.syss.de/pentest-blog/syss-2020-044-sicherheitsproblem-in-screen-sharThird Party Advisory
- https://www.youtube.com/watch?v=SonmmgQlLzgThird Party Advisory
- https://zoom.us/trust/security/security-bulletinVendor Advisory
FAQ
What is CVE-2021-28133?
CVE-2021-28133 is a vulnerability with a CVSS score of 4.3 (MEDIUM). Zoom through 5.5.4 sometimes allows attackers to read private information on a participant's screen, even though the participant never attempted to share the private part of their screen. When a user ...
How severe is CVE-2021-28133?
CVE-2021-28133 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-28133?
Check the references section above for vendor advisories and patch information. Affected products include: Zoom Zoom.