Privilege escalation in FortiClient (Windows)

1) External Control of File Name or Path

EUVDB-ID: #VU62774

Risk: Low

CVSSv4.0: 5.9 [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/E:U/U:Clear]

CVE-ID: CVE-2021-43066

CWE-ID: CWE-73 - External Control of File Name or Path

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application allows an attacker to control path of the files. A local user can delete or execute files with admin rights via the MSI installer.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiClient for Windows: 6.0.0 - 7.0.2

CPE2.3

• cpe:2.3:a:fortinet:fortinet_forticlient:6.0.10:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_forticlient:6.2.9:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_forticlient:6.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_forticlient:7.0.2:*:*:*:*:*:*:*

External links

https://fortiguard.fortinet.com/psirt/FG-IR-21-154

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.