#VU73201 NULL pointer dereference in FortiOS and FortiProxy - CVE-2022-45861

Vulnerability identifier: #VU73201

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-2022-45861

CWE-ID: CWE-476

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 user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the SSL-VPN portal. A remote authenticated user can send a specially crafted HTTP GET request and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.2.0 - 6.2.13, 6.4.0 - 6.4.11, 7.0.0 - 7.0.9, 7.2.0 - 7.2.3

FortiProxy: 1.1.5 - 1.1.6, 1.2.0 - 1.2.13, 2.0.0 - 2.0.11, 7.0.0 - 7.0.7, 7.2.0 - 7.2.1

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External links
https://fortiguard.com/psirt/FG-IR-22-477

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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.