Missing integrity check in FortiGate FortiOS

1) Download of code without integrity check

EUVDB-ID: #VU60735

Risk: Medium

CVSSv4.0: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2021-44168

CWE-ID: CWE-494 - Download of Code Without Integrity Check

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise the affected system

The vulnerability exists due to software does not perform software integrity check when downloading updates in the "execute restore src-vis" command. A remote attacker with ability to perform man-in-the-middle (MitM) attack can supply a malicious software image and gain full control over the affected system after a successful software update.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 7.0.2

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.0.13:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.9:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.7:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.2:*:*:*:*:*:*:*

External links

https://fortiguard.com/psirt/FG-IR-21-201

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.