Detections
Analytics

Fortinet Fortigate IPS Engine evasion using custom TCP flags (FG-IR-23-090)

high Nessus Plugin ID 209749

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Synopsis

Fortinet Firewall is missing one or more security-related updates.

Description

The version of Fortigate installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-23-090 advisory.

 - A interpretation conflict in Fortinet IPS Engine versions 7.321, 7.166 and 6.158 allows attacker to evade IPS features via crafted TCP packets. (CVE-2023-40718)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Please upgrade to FortiOS version 6.4.13/6.0160/7.0.12/7.2.5/7.4.0/7.0167/7.0313/7.0314/7.0493 or later.

See Also

https://www.fortiguard.com/psirt/FG-IR-23-090

Plugin Details

Severity: High

ID: 209749

File Name: fortigate_FG-IR-23-090.nasl

Version: 1.2

Type: local

Family: Firewalls

Published: 10/26/2024

Updated: 10/28/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2023-40718

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

Required KB Items: Host/Fortigate/model, Host/Fortigate/version

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 10/10/2023

Reference Information

CVE: CVE-2023-40718

IAVA: 2023-A-0643-S