Denial of service in FortiOS and FortiProxy

1) Use-after-free

EUVDB-ID: #VU81928

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-41675

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the Web proxy process. A remote non-authenticated attacker can send multiple specially crafted packets to the device and perform a denial of service (DoS) attack.

Successful exploitation of the vulnerability requires that SSL deep packet inspection is enabled.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 7.0.0 - 7.2.4

FortiProxy: 7.0.0 - 7.2.2

CPE2.3

• cpe:2.3:o:fortinet:fortios:7.0.0:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.3:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.4:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.5:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.7:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.8:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.9:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.0.0:*:*:*:*:*:*:*

External links

https://fortiguard.com/psirt/FG-IR-23-184

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.