Home/CVE/An arbitrary file overwrite vulnerability in NoMachine Free Edition and Enterprise Client for macOS before v8.8.1 allows
CVE

CVE-2023-39107

An arbitrary file overwrite vulnerability in NoMachine Free Edition and Enterprise Client for macOS before v8.8.1 allows

An arbitrary file overwrite vulnerability in NoMachine Free Edition and Enterprise Client for macOS before v8.8.1 allows attackers to overwrite root-owned files by using hardlinks.

CRITICAL · CVSS 9.1 EPSS 0.00358
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-59Improper Link Resolution Before File Access ('Link Following')
▤

Affected Products & Versions

1
nomachine< 8.8.1
⚠

Public Exploits & PoCs

1
pocwww.ns-echo.com · nomachine_afo.htmlwww.ns-echo.com
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Microsoft Office Child Process - MacOS
producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS
producthighBinary Padding - MacOS
productmediumSuspicious Execution via macOS Script Editor
productmediumSystem Information Discovery Via Sysctl - MacOS
productmediumNew File Exclusion Added To Time Machine Via Tmutil - MacOS
▣

Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Aug 2023 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.nomachine.com/SU07U00247Release Notes
https://kb.nomachine.com/TR07U10948Vendor Advisory
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