CVE-2021-42758 : Security Advisory and Response

An improper access control vulnerability in FortiWLC 8.6.1 and below may allow attackers with low privileges to execute commands as admin users.

Understanding CVE-2021-42758

This CVE involves an improper access control vulnerability in FortiWLC versions 8.6.1 and below, potentially leading to unauthorized command execution.

What is CVE-2021-42758?

CVE-2021-42758 is an improper access control vulnerability found in Fortinet's FortiWLC, specifically affecting versions 8.6.1 and earlier. The flaw could be exploited by authenticated remote attackers with limited privileges to run arbitrary commands as admin users by bypassing GUI restrictions.

The Impact of CVE-2021-42758

The vulnerability scores a CVSS base score of 8.8 (High severity) with a high impact on confidentiality, integrity, and availability.

Technical Details of CVE-2021-42758

This section delves into the technical specifics of CVE-2021-42758.

Vulnerability Description

The vulnerability allows authenticated remote attackers with low privileges to execute any command as an admin user by circumventing GUI restrictions.

Affected Systems and Versions

Product: Fortinet FortiWLC
Vendor: Fortinet
Vulnerable Versions: FortiWLC 8.6.1 and below

Exploitation Mechanism

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Exploit Code Maturity: Proof of Concept

Mitigation and Prevention

Given the severity of CVE-2021-42758, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Update FortiWLC to a non-vulnerable version if available.
Restrict network access to the vulnerable system.
Monitor for any suspicious activity or unauthorized access.

Long-Term Security Practices

Regularly update and patch FortiWLC systems.
Implement the principle of least privilege to restrict user capabilities.
Conduct security training to raise awareness about phishing and social engineering attacks.

Patching and Updates

Fortinet may release patches or updates to address the vulnerability.