Remote code execution in FortiOS and FortiProxy in deep inspection mode

1) Stack-based buffer overflow

EUVDB-ID: #VU78112

Risk: Critical

CVSSv4.0: 8.1 [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:U/U:Red]

CVE-ID: CVE-2023-33308

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing specially crafted packets. A remote unauthenticated attacker can send specially crafted packets to the device having proxy policies or firewall policies with proxy mode alongside SSL deep packet inspection, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 7.0.0 - 7.2.3

FortiProxy: 7.0.0 - 7.2.2

CPE2.3

• cpe:2.3:o:fortinet:fortios:7.0.10:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.2.3:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.0.9:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.2.2:*:*:*:*:*:*:*

External links

https://fortiguard.fortinet.com/psirt/FG-IR-23-183

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.