#VU73200 Buffer Underwrite ('Buffer Underflow') in FortiOS and FortiProxy - CVE-2023-25610

Vulnerability identifier: #VU73200

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2023-25610

CWE-ID: CWE-124

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to compromise the affected device.

The vulnerability exists due to a heap buffer underflow in the administrative interface. A remote non-authenticated attacker can send a specially crafted request to the administrative web interface of the affected device, trigger memory corruption and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 6.0.16, 6.2.0 - 6.2.12, 6.4.0 - 6.4.11, 7.0.0 - 7.0.9, 7.2.0 - 7.2.3

FortiProxy: 1.1.0 - 1.1.6, 1.2.0 - 1.2.13, 2.0.0 - 2.0.11, 7.0.0 - 7.0.8, 7.2.0 - 7.2.2

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External links
https://fortiguard.fortinet.com/psirt/FG-IR-23-001

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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. However, proof of concept for this vulnerability is available.