Denial of service in FortiOS and FortiProxy SSL VPN



Published: 2023-11-17
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-36641
CWE-ID CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		FortiOS
Operating systems & Components / Operating system

FortiProxy
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU83247

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36641

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 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 - 7.4.0

FortiProxy: 1.0.0 - 7.2.4

External links

http://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.



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