CVE-2020-12812 : Vulnerability Insights and Analysis

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 allow users to log in without the second factor of authentication.

Understanding CVE-2020-12812

This CVE identifies an improper authentication vulnerability in Fortinet FortiOS that could potentially compromise the security of SSL VPN authentication.

What is CVE-2020-12812?

The vulnerability in SSL VPN in FortiOS versions 6.4.0, 6.2.0 to 6.2.3, and 6.0.9 and below could enable a user to successfully log in without being prompted for the second factor of authentication (FortiToken) if they modified the case of their username.

The Impact of CVE-2020-12812

This vulnerability could lead to unauthorized access to SSL VPN, bypassing the intended two-factor authentication security measure.

Technical Details of CVE-2020-12812

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows users to bypass the second factor of authentication in SSL VPN by changing the case of their username.

Affected Systems and Versions

Product: Fortinet FortiOS
Versions Affected: FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below

Exploitation Mechanism

The vulnerability can be exploited by manipulating the case sensitivity of the username during the authentication process.

Mitigation and Prevention

Protecting systems from CVE-2020-12812 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to address the vulnerability.
Monitor for any unauthorized access or unusual login activities.

Long-Term Security Practices

Enforce strong password policies and multi-factor authentication practices.
Regularly review and update access controls and authentication mechanisms.

Patching and Updates

Fortinet has likely released patches or updates to fix the vulnerability. Ensure that your FortiOS is updated to a secure version.