#VU107319 NULL pointer dereference in FortiOS - CVE-2023-42785

Vulnerability identifier: #VU107319

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-42785

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

Description

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

The vulnerability exists due to a NULL pointer dereference error in SSL VPN service. A remote user can send a specially crafted HTTP request and crash the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 6.0.18, 6.2.0 - 6.2.17, 6.4.0 - 6.4.16, 7.0.0 - 7.0.17, 7.2.0 - 7.2.11, 7.4.0 - 7.4.7, 7.6.0 - 7.6.2

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External links
https://fortiguard.fortinet.com/psirt/FG-IR-23-293

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.