#VU103885 Format string error in FortiOS - CVE-2023-40721

Vulnerability identifier: #VU103885

Vulnerability risk: Low

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

CVE-ID: CVE-2023-40721

CWE-ID: CWE-134

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a format string error in certain CLI commands. A local user can supply a specially crafted input that contains format string specifiers to the affected CLI command and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.2.0 - 6.2.16, 6.4.0 - 6.4.15, 7.0.0 - 7.0.13, 7.2.0 - 7.2.6, 7.4.0 - 7.4.1

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External links
https://fortiguard.com/psirt/FG-IR-23-261

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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.