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CVE-2021-34420— Zoom Windows installation executable signature bypass

Quick assessment

Affected
Zoom Video Communications Inc Zoom Client for Meetings for Windows
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZOOM Client是美国ZOOM公司的一款支持多种平台的视频会议客户端应用程序。 Zoom Client for Meetings 5.5.4之前版本的windows 安装程序存在数据伪造问题漏洞，该漏洞源于未正确验证扩展名为.msi、.ps1和.bat的文件的签名。攻击者可利用该漏洞在客户的计算机上安装恶意软件。

CVSS 4.7 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-34420

Vulnerability Information
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Vulnerability Title
Zoom Windows installation executable signature bypass
Source: CVE Program / CVE List V5
Vulnerability Description
The Zoom Client for Meetings for Windows installer before version 5.5.4 does not properly verify the signature of files with .msi, .ps1, and .bat extensions. This could lead to a malicious actor installing malicious software on a customer’s computer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Zoom Client 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZOOM Client是美国ZOOM公司的一款支持多种平台的视频会议客户端应用程序。 Zoom Client for Meetings 5.5.4之前版本的windows 安装程序存在数据伪造问题漏洞，该漏洞源于未正确验证扩展名为.msi、.ps1和.bat的文件的签名。攻击者可利用该漏洞在客户的计算机上安装恶意软件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zoom Video Communications Inc Zoom Client for Meetings for Windows unspecified ~ 5.5.4 -

II. Public POCs for CVE-2021-34420

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III. Intelligence Information for CVE-2021-34420

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Security Blog Posts for CVE-2021-34420 (1)

Other References for CVE-2021-34420 (1)

Same Patch Batch · Zoom Video Communications Inc · 2021-11-11 · 6 CVEs total

CVE-2021-34417 7.9 HIGH Authenticated remote command execution with root privileges via web console in MMR
CVE-2021-34422 7.2 HIGH Path traversal of file names in Keybase Client for Windows
CVE-2021-34418 4.0 MEDIUM Pre-auth Null pointer crash in on-premise web console
CVE-2021-34419 3.7 LOW HTML injection in Zoom Linux client
CVE-2021-34421 3.7 LOW Retained exploded messages in Keybase Clients for Android and iOS

IV. Related Vulnerabilities

Same product: Zoom Client for Meetings for Windows
Same vendor: Zoom Video Communications Inc

V. Comments for CVE-2021-34420

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