PT-2021-7439 · Zoom · Zoom Client For Meetings

Laurent Delosieres · Published 2021-11-09 · Updated 2021-12-16 · CVE-2021-34420

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Zoom Client for Meetings for Windows versions prior to 5.5.4

Description The issue is related to the improper verification of cryptographic signatures for files with .msi, .ps1, and .bat extensions. This could allow a malicious actor to install malicious software on a customer's computer, potentially compromising the integrity of protected information.

Recommendations For versions prior to 5.5.4, update to version 5.5.4 or later to resolve the issue. As a temporary workaround, consider restricting the execution of files with .msi, .ps1, and .bat extensions until the update is applied.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

BDU:2022-06300

CVE-2021-34420

Affected Products

Zoom Client For Meetings

References · 7

• https://osv.dev/vulnerability/CVE-2021-34420 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34420 · Security Note
• https://explore.zoom.us/en/trust/security/security-bulletin · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-06300 · Security Note
• https://t.me/cibsecurity/32271 · Telegram Post
• https://medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerability-in-zoom-80f57fb0822e · Note
• https://t.me/true_secator/2322 · Telegram Post