#VU84450 Improper Authentication in Fortinet FortiMail - CVE-2023-47539

Vulnerability identifier: #VU84450

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-47539

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Fortinet FortiMail
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing HTTP requests in FortiMail configured with RADIUS authentication and remote_wildcard enabled. A remote non-authenticated attacker can bypass authentication process and login as administrator.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiMail: 7.4.0

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External links
https://www.fortiguard.com/psirt/FG-IR-23-439

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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 Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.