#VU83247 NULL pointer dereference in FortiOS and FortiProxy - CVE-2023-36641


Vulnerability identifier: #VU83247

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-2023-36641

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 when processing HTTP headers in SSL VPN. A remote user can send a specially crafted HTTP request to the system and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 6.0.17, 6.2.0 - 6.2.15, 6.4.0 - 6.4.14, 7.0.0 - 7.0.12, 7.2.0 - 7.2.5, 7.4.0

FortiProxy: 1.0.0 - 1.0.7, 1.1.0 - 1.1.6, 1.2.0 - 1.2.13, 2.0.0 - 2.0.13, 7.0.0 - 7.0.10, 7.2.0 - 7.2.4


External links
https://fortiguard.com/psirt/FG-IR-23-151


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.


Latest bulletins with this vulnerability