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.
7.9$0-$5k0.00

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 highly functional. 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.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

NVD Base Score: 9.8
NVD 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: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Highly functional

EPSS Score: 🔍
EPSS Percentile: 🔍

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

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

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 🔍
04/20/2024 +1365 days 🔍

Sourcesinfo

Vendor: fortinet.com

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

CVE: CVE-2020-12812 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/25/2020 08:58
Updated: 04/20/2024 19:51
Changes: 07/25/2020 08:58 (48), 07/25/2020 09:03 (18), 04/20/2024 19:51 (28)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!