Security restrictions bypass in FortiOS IPS Engine



Published: 2023-12-15
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-40718
CWE-ID CWE-436
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		IPSEngine
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Interpretation Conflict

EUVDB-ID: #VU84443

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-40718

CWE-ID: CWE-436 - Interpretation Conflict

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security policies.

The vulnerability exists due to an interpretation conflict when handling custom TCP flags. A remote attacker can send specially crafted TCP packets to evade NGFW policies or IPS Engine protection.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

IPSEngine: before 7.0313

External links

http://fortiguard.com/psirt/FG-IR-23-090


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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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