Security restrictions bypass in FortiOS IPS Engine



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
 IPSEngine
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Interpretation Conflict

EUVDB-ID: #VU84443

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

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 6.0159

CPE2.3 External links

https://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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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