PT-2022-2395 · Nomachine · Nomachine

Published 2022-04-28 · Updated 2022-05-07 · CVE-2021-33436

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions NoMachine for Windows versions prior to 6.15.1 and 7.5.2

Description The issue is related to the incorrect handling of the DLL search path in the NoMachine remote desktop access system, allowing for local privilege escalation due to the lack of safe DLL loading. This enables local non-privileged users to perform DLL Hijacking via any writable directory listed under the system path, ultimately executing code as NT AUTHORITYSYSTEM.

Recommendations For versions prior to 6.15.1, update to version 6.15.1 or later to resolve the issue. For versions prior to 7.5.2, update to version 7.5.2 or later to resolve the issue.

Fix

Untrusted Search Path

Weakness Enumeration

CWE-426

Related Identifiers

BDU:2022-02765

CVE-2021-33436

Affected Products

Nomachine

References · 9

• https://knowledgebase.nomachine.com/SU05S00223 · Vendor Advisory
• https://knowledgebase.nomachine.com/SU05S00224 · Vendor Advisory
• https://knowledgebase.nomachine.com/TR05S10236 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33436 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33436 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-02765 · Security Note
• https://github.com/active-labs/Advisories/blob/master/2021/ACTIVE-2021-001.md · Note
• https://t.me/cibsecurity/41550 · Telegram Post
• https://t.me/cvenotify/29825 · Telegram Post