Insecure DLL loading in Fortinet FortiClient for Windows and FortiClient VPN

1) Insecure DLL loading

EUVDB-ID: #VU47346

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-9290

CWE-ID: CWE-427 - Uncontrolled Search Path Element

Exploit availability: No

Description

The vulnerability allows a local attacker to compromise vulnerable system.

The vulnerability exists due to the application loads DLL libraries in an insecure manner. A local attacker with control over the directory in which FortiClientOnlineInstaller.exe and FortiClientVPNOnlineInstaller.exe resides can execute arbitrary code on the system via uploading malicious Filter Library DLL files in that directory.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiClient for Windows: - - 6.2.3

CPE2.3

• cpe:2.3:a:fortinet:fortinet_forticlient:6.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_forticlient:6.2.3:*:*:*:*:*:*:*

External links

https://fortiguard.com/psirt/FG-IR-19-060

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.