UNIX Hard Link in macOS - CVE-2021-30738
Published: May 24, 2021
Vulnerability identifier: #VU53486
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-30738
CWE-ID: CWE-62
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local application to overwrite arbitrary files.
The vulnerability exists due to path validation logic for hardlinks in PackageKit. A local application can overwrite arbitrary files on the system.
Affected software
macOS
How to mitigate CVE-2021-30738
Install updates from vendor's website.
macOS - addressed in versions 11.4 20F71, 10.14.6 18G9216