Zoom up to 5.4.3/5.5.4 on Windows/Linux Screen Sharing information disclosure

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CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.42

A vulnerability classified as problematic was found in Zoom up to 5.4.3/5.5.4 on Windows/Linux. Affected by this vulnerability is an unknown part of the component Screen Sharing Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was presented 03/19/2021 as SYSS-2020-044. The advisory is shared at syss.de. This vulnerability is known as CVE-2021-28133 since 03/10/2021. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The problem might be mitigated by replacing the product with as an alternative.

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VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔒

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VulDB Base Score: 🔒
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VulDB Reliability: 🔍

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Exploitinginfoedit

Class: Information disclosure
CWE: CWE-200
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Recommended: Alternative
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0-Day Time: 🔒

Timelineinfoedit

03/10/2021 CVE assigned
03/19/2021 +9 days Advisory disclosed
03/19/2021 +0 days VulDB entry created
04/02/2021 +14 days VulDB last update

Sourcesinfoedit

Advisory: SYSS-2020-044
Status: Not defined

CVE: CVE-2021-28133 (🔒)

Entryinfoedit

Created: 03/19/2021 07:07 AM
Updated: 04/02/2021 07:47 PM
Changes: (18) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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