Fortinet FortiOS up to 6.0.9/6.2.3/6.4.0 Two Factor Authentication Username improper authentication

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Fortinet FortiOS up to 6.0.9/6.2.3/6.4.0. Affected by this issue is some unknown functionality of the component Two Factor Authentication. This manipulation as part of Username causes improper authentication. This vulnerability is registered as CVE-2020-12812. Remote exploitation of the attack is possible. Furthermore, an exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Fortinet FortiOS up to 6.0.9/6.2.3/6.4.0 (Firewall Software). Affected by this vulnerability is an unknown code of the component Two Factor Authentication. The manipulation as part of a Username leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published 07/13/2020 as FG-IR-19-283 as confirmed advisory (Website). It is possible to read the advisory at fortiguard.com. The advisory contains:

This happens when two-factor authentication is enabled in the "user local" setting, and that user authentication type is set to a remote authentication method (eg: ldap).
This vulnerability is known as CVE-2020-12812 since 05/12/2020. The attack can be launched remotely. A single authentication is needed for exploitation. Technical details are unknown but an exploit is available. The advisory points out:
An improper authentication vulnerability in SSL VPN in FortiOS 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.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 209803 (Fortinet Fortigate (FG-IR-19-283)), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Upgrading to version 6.0.10, 6.2.4 or 6.4.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

A new CLI attribute called "username-case-sensitivity" was added in "user local" CLI settings, and is now available when remote and two-factor authentication are both enabled.

The vulnerability is also documented in the vulnerability database at Tenable (209803). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 209803
Nessus Name: Fortinet Fortigate (FG-IR-19-283)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: FortiOS 6.0.10/6.2.4/6.4.1

Timelineinfo

05/12/2020 🔍
07/13/2020 +62 days 🔍
07/13/2020 +0 days 🔍
07/25/2020 +12 days 🔍
02/05/2025 +1656 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-19-283
Status: Confirmed

CVE: CVE-2020-12812 (🔍)
GCVE (CVE): GCVE-0-2020-12812
GCVE (VulDB): GCVE-100-158995
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/25/2020 08:58
Updated: 02/05/2025 05:15
Changes: 07/25/2020 08:58 (48), 07/25/2020 09:03 (18), 04/20/2024 19:51 (28), 09/09/2024 22:29 (1), 10/27/2024 10:15 (2), 02/05/2025 05:15 (12)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!