CVE-2021-36171 Explained : Impact and Mitigation

A vulnerability has been discovered in Fortinet FortiPortal before version 6.0.6 that allows a remote unauthenticated attacker to predict generated passwords due to the use of a weak pseudo-random number generator in the password reset feature.

Understanding CVE-2021-36171

This section will delve into the details of the CVE-2021-36171 vulnerability.

What is CVE-2021-36171?

The vulnerability in Fortinet FortiPortal before 6.0.6 arises from a cryptographically weak pseudo-random number generator used in the password reset feature. This flaw enables remote unauthenticated attackers to predict newly generated passwords within a specified time frame.

The Impact of CVE-2021-36171

The impact of this vulnerability is rated as HIGH. It has a CVSS base score of 7.4, indicating a significant risk to confidentiality, integrity, and availability of the affected systems. The exploit has a high attack complexity and does not require any privileges from the attacker.

Technical Details of CVE-2021-36171

Let's explore the technical details associated with CVE-2021-36171.

Vulnerability Description

The vulnerability stems from the inappropriate use of a weak pseudo-random number generator during password reset operations in Fortinet FortiPortal versions prior to 6.0.6.

Affected Systems and Versions

Fortinet FortiPortal versions before 6.0.6 are affected by this vulnerability, exposing them to the risk of password prediction by remote unauthenticated attackers.

Exploitation Mechanism

Exploiting this vulnerability involves leveraging the weak pseudo-random number generator in the password reset feature to predict potential passwords within a specific time window.

Mitigation and Prevention

In this section, we will discuss the steps to mitigate and prevent the CVE-2021-36171 vulnerability.

Immediate Steps to Take

Immediately update Fortinet FortiPortal to version 6.0.6 or higher to eliminate the use of the weak pseudo-random number generator and prevent password prediction attacks.

Long-Term Security Practices

Implement secure password reset mechanisms and regularly audit cryptographic functions to ensure robust security practices within the system.

Patching and Updates

Stay informed about security advisories from Fortinet and promptly apply patches and updates to address known vulnerabilities and enhance the overall security posture of the FortiPortal system.