UNIX Hard Link in NoMachine - CVE-2023-39107
Published: January 29, 2024
Vulnerability identifier: #VU85867
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-39107
CWE-ID: CWE-62
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
NoMachine
NoMachine
Software vendor:
NoMachine
NoMachine
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.
Remediation
Install updates from vendor's website.