Denial of service in NoMachine



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-39107
CWE-ID CWE-62
Exploitation vector Local
Public exploit N/A
Vulnerable software
 NoMachine
Client/Desktop applications / Software for system administration

Vendor NoMachine

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) UNIX Hard Link

EUVDB-ID: #VU85867

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-39107

CWE-ID: CWE-62 - UNIX Hard Link

Exploit availability: No

Description

The vulnerability allows a local user to overwrite arbitrary files on the system.

The vulnerability exists due to insecure permissions for the log directory in /Library/Application Support/NoMachine/var on macOS. A local user can create a hard link to a critical file on the system and overwrite it with root privileges, resulting in a denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NoMachine: before 8.8.1

CPE2.3 External links

http://kb.nomachine.com/SU07U00247
http://kb.nomachine.com/TR07U10948
http://www.ns-echo.com/posts/nomachine_afo.html


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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