Fortinet Fortigate MFA bypass by changing username case (FG-IR-19-283)

critical Nessus Plugin ID 209803

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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-19-283 advisory.

- An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username. (CVE-2020-12812)

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 6.0.10/6.2.4/6.4.1 or later.

Plugin Details

Severity: Critical

ID: 209803

File Name: fortigate_FG-IR-19-283.nasl

Version: 1.3

Type: local

Family: Firewalls

Published: 10/27/2024

Updated: 10/28/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

CVSS Score Source: CVE-2020-12812

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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

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

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

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

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 7/24/2020

CISA Known Exploited Vulnerability Due Dates: 5/3/2022

Reference Information

CVE: CVE-2020-12812

IAVA: 2020-A-0440-S

Detections

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