Denial of service in FortiOS and FortiProxy SSL VPN portal

1) NULL pointer dereference

EUVDB-ID: #VU73201

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 - NULL Pointer Dereference

Exploit availability: No

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 - 7.2.3

FortiProxy: 1.1.5 - 7.2.1

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.2.13:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.11:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.9:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.2.3:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:1.1.6:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:1.2.13:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:2.0.11:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.0.7:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.2.1:*:*:*:*:*:*:*

External links

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

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.