#VU77180 Out-of-bounds write in FortiOS and FortiProxy - CVE-2023-22639

Vulnerability identifier: #VU77180

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-2023-22639

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
FortiOS
Operating systems & Components / Operating system
FortiProxy
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Fortinet, Inc

Description

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

The vulnerability exists due to a boundary error within CLI. A local user can pass specially crafted arguments to the affected command to trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 6.0.17, 6.2.0 - 6.2.15, 6.4.0 - 6.4.12, 7.0.0 - 7.0.10, 7.2.0 - 7.2.3

FortiProxy: 1.0.0 - 1.0.7, 1.1.0 - 1.1.6, 1.2.0 - 1.2.13, 2.0.0 - 2.0.12, 7.0.0 - 7.0.8, 7.2.0 - 7.2.2

---

External links
https://fortiguard.fortinet.com/psirt/FG-IR-22-494

---

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.