Vulnerability Report

CVE-2021-28133

Title: Zoom Screen Sharing Information Disclosure Vulnerability

Information Disclosure

Proof Of Concept

No public PoC currently indexed for CVE-2021-28133.

CWE Category CWE-200
Published Date Mar 18, 2021
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 4.3 CVSS v3.1
Exploit Probability (EPSS)
16.29%

Vulnerability Summary

CVE-2021-28133: 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.

Impacted Vendors

Z
zoom 1
M
mattermost 1

Reference Links

http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.0301-Information-Disclosure.html 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 http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.0301-Information-Disclosure.html 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
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.3
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:N/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-28133 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected Stack

No specific products linked.