CVE-2021-26107 : Vulnerability Insights and Analysis

This article provides an in-depth analysis of CVE-2021-26107, focusing on the improper access control vulnerability found in Fortinet FortiManager versions 6.4.4 and 6.4.5, along with its impact, technical details, and mitigation strategies.

Understanding CVE-2021-26107

CVE-2021-26107 is an improper access control vulnerability discovered in Fortinet FortiManager versions 6.4.4 and 6.4.5 that could allow an authenticated attacker with restricted user permissions to manipulate the VPN tunnel status of other VDOMs using the VPN Manager.

What is CVE-2021-26107?

An improper access control vulnerability in FortiManager versions 6.4.4 and 6.4.5 enables a restricted user profile to unauthorizedly change the VPN tunnel status of other Virtual Domains (VDOMs) through the VPN Manager.

The Impact of CVE-2021-26107

The vulnerability has a CVSS base score of 6.3, indicating a medium severity issue. It could be exploited by an authenticated attacker with limited privileges, potentially leading to unauthorized modifications in the VPN configurations of affected systems.

Technical Details of CVE-2021-26107

The vulnerability is characterized by an improper access control flaw that affects the VPN tunnel status of different VDOMs managed by FortiManager versions 6.4.4 and 6.4.5.

Vulnerability Description

The flaw allows a restricted user profile to alter VPN tunnel configurations of various VDOMs using the VPN Manager, posing a security risk for impacted systems.

Affected Systems and Versions

Fortinet FortiManager versions 6.4.4 and 6.4.5 are confirmed to be impacted by this vulnerability, potentially leaving them exposed to unauthorized VPN configuration changes.

Exploitation Mechanism

An authenticated attacker with restricted user permissions can exploit this vulnerability to manipulate VPN tunnel settings within the VPN Manager, affecting other VDOMs.

Mitigation and Prevention

In response to CVE-2021-26107, immediate actions and long-term security practices are essential to safeguard impacted systems.

Immediate Steps to Take

Administrators should apply the provided workarounds and access control measures to mitigate the risk of unauthorized VPN tunnel modifications.

Long-Term Security Practices

Regular security assessments, access restriction reviews, and ongoing monitoring of VPN configurations can fortify the overall security posture against similar vulnerabilities.

Patching and Updates

Fortinet has released patches or updates to address the improper access control vulnerability in FortiManager versions 6.4.4 and 6.4.5. It is crucial for users to promptly apply these patches to secure their systems.