CVE-2021-34422— Path traversal of file names in Keybase Client for Windows
Quick assessment
Affected
Zoom Video Communications Inc Keybase Client 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.
Keybase是一套基于PGP技术的、支持端到端加密的社交网络平台。 Keybase Client for Windows 5.7.0之前版本存在安全漏洞，攻击者可利用该漏洞使用精心编制的文件名将文件上载到共享文件夹，导致远程代码执行。
Possible ATT&CK Techniques 3 AI
T1105 · Ingress Tool Transfer T1059 · Command and Scripting Interpreter T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2021-34422
Vulnerability Information
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Vulnerability Title
Path traversal of file names in Keybase Client for Windows
Source: CVE Program / CVE List V5
Vulnerability Description
The Keybase Client for Windows before version 5.7.0 contains a path traversal vulnerability when checking the name of a file uploaded to a team folder. A malicious user could upload a file to a shared folder with a specially crafted file name which could allow a user to execute an application which was not intended on their host machine. If a malicious user leveraged this issue with the public folder sharing feature of the Keybase client, this could lead to remote code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Keybase 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keybase是一套基于PGP技术的、支持端到端加密的社交网络平台。 Keybase Client for Windows 5.7.0之前版本存在安全漏洞，攻击者可利用该漏洞使用精心编制的文件名将文件上载到共享文件夹，导致远程代码执行。
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 | Keybase Client for Windows | unspecified ~ 5.7.0 | - |
|
II. Public POCs for CVE-2021-34422
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-34422 (1)
-
https://explore.zoom.us/en/trust/security/security-bulletin x_refsource_MISC
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-2021-34420 | 4.7 MEDIUM | Zoom Windows installation executable signature bypass |
| 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 vendor: Zoom Video Communications Inc
-
CVE-2023-28596
Local Privilege Escalation in Zoom for macOS Installers -
CVE-2023-28597
Improper trust boundary implementation for SMB in Zoom Clien -
CVE-2023-22881
Denial of Service in Zoom Clients -
CVE-2023-22882
Denial of Service in Zoom Clients -
CVE-2023-22880
Information Disclosure in Zoom for Windows Clients
V. Comments for CVE-2021-34422
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