Privilege escalation in FortiProxy CLI

1) Format string error

EUVDB-ID: #VU103885

Risk: Low

CVSSv4.0: [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 - Use of Externally-Controlled Format String

Exploit availability: No

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 update from vendor's website.

Vulnerable software versions

FortiProxy: 1.2.0 - 7.4.0

CPE2.3

• cpe:2.3:h:fortinet:fortiproxy:1.2.13:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:2.0.14:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.0.14:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.2.7:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.4.0:*:*:*:*:*:*:*

External links

http://www.fortiguard.com/psirt/FG-IR-23-261

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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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