#VU81928 Use-after-free in FortiOS and FortiProxy - CVE-2023-41675

Vulnerability identifier: #VU81928

Vulnerability 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

Exploitation vector: Network

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 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 - 7.0.10, 7.2.0 - 7.2.4

FortiProxy: 7.0.0 - 7.0.8, 7.2.0 - 7.2.2

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

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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.