CVE-2021-42759 : Exploit Details and Defense Strategies

Fortinet Meru AP versions 8.6.1 and below have a vulnerability that allows attackers to execute unauthorized code or commands.

Understanding CVE-2021-42759

A violation of secure design principles in Fortinet Meru AP versions 8.6.1 and below enables unauthorized code execution through crafted CLI commands.

What is CVE-2021-42759?

The vulnerability in Fortinet Meru AP versions 8.6.1 and below allows attackers to run unauthorized code or commands via specifically crafted CLI commands.

The Impact of CVE-2021-42759

The impact of this vulnerability is rated with a CVSS base score of 6.3 (Medium severity), with high confidentiality and integrity impacts. Attackers with high privileges can exploit this issue.

Technical Details of CVE-2021-42759

The technical details of the CVE-2021-42759 vulnerability are as follows:

Vulnerability Description

The flaw in Fortinet Meru AP versions 8.6.1 and below violates secure design principles, permitting unauthorized code execution through crafted CLI commands.

Affected Systems and Versions

Product: Fortinet Meru AP
Vendor: Fortinet
Vulnerable Versions: 8.6.1, 8.6.0, 8.5.5, 8.5.4, 8.5.3, 8.5.2, 8.5.1, 8.5.0

Exploitation Mechanism

Attackers require high privileges to exploit this vulnerability, leveraging specially crafted CLI commands to execute unauthorized code or commands.

Mitigation and Prevention

It is crucial to take immediate steps to secure systems vulnerable to CVE-2021-42759:

Immediate Steps to Take

Apply vendor-supplied patches promptly
Monitor network traffic for signs of exploitation
Restrict access to vulnerable systems

Long-Term Security Practices

Regular security training and awareness programs
Implement the principle of least privilege
Conduct routine security assessments

Patching and Updates

Install the latest updates and patches provided by Fortinet to address the vulnerability.