Vulnerability identifier: #VU68929

Vulnerability risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-26122

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
AV engine
Hardware solutions / Firmware
Fortinet FortiMail
Server applications / IDS/IPS systems, Firewalls and proxy servers
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient verification of data authenticity. A remote attacker can bypass the AV engine via manipulating MIME attachment with junk and pad characters in base64.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AV engine: 0.4.23 - 6.253

Fortinet FortiMail: 6.0.0 - 7.0.2

FortiOS: 6.4.0 - 6.4.10, 6.0.0 - 6.0.15, 6.2.0 - 6.2.11, 7.0.0 - 7.0.6, 7.2.0

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External links
http://fortiguard.fortinet.com/psirt/FG-IR-22-074

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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.