#VU60735 Download of code without integrity check in FortiOS - CVE-2021-44168

Vulnerability identifier: #VU60735

Vulnerability 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

Exploitation vector: Local network

Exploit availability: Yes

Vulnerable software:
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

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 - 6.0.13, 6.2.0 - 6.2.9, 6.4.0 - 6.4.7, 7.0.0 - 7.0.2

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

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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.