UNIX symbolic link following in Fortinet FortiClient for Windows - CVE-2021-26089
Published: June 17, 2021 / Updated: July 14, 2021
Vulnerability identifier: #VU54205
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-2021-26089
CWE-ID: CWE-61
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue in FortiClient installer for MacO. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application.
Successful exploitation of this vulnerability may result in privilege escalation.
Affected software
Fortinet FortiClient for Windows
How to mitigate CVE-2021-26089
Install updates from vendor's website.
Fortinet FortiClient for Windows - addressed in versions 6.4.4, 7.0.0