CVE-2021-43072 : Vulnerability Insights and Analysis

CVE-2021-43072 involves a buffer overflow vulnerability affecting Fortinet products. This vulnerability allows an attacker to execute unauthorized code or commands, posing a high risk to confidentiality, integrity, and availability.

Understanding CVE-2021-43072

What is CVE-2021-43072?

A buffer overflow vulnerability in Fortinet products allows attackers to execute unauthorized code or commands via crafted CLI operations, potentially leading to the execution of malicious actions.

The Impact of CVE-2021-43072

This vulnerability can have severe consequences, including unauthorized code execution, compromising the confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-43072

Vulnerability Description

The vulnerability involves a buffer copy without checking input size in various versions of Fortinet products, enabling attackers to execute unauthorized code or commands.

Affected Systems and Versions

FortiAnalyzer: Versions 5.6.0 to 7.0.2
FortiManager: Versions 5.6.0 to 7.0.2

Exploitation Mechanism

Attackers can exploit this vulnerability via crafted CLI operations using the tFTP protocol, specifically with commands like

execute restore image

and

execute certificate remote

.

Mitigation and Prevention

Immediate Steps to Take

Upgrade FortiManager to version 7.0.3 or above
Upgrade FortiAnalyzer to version 7.0.3 or above
Upgrade FortiOS to version 7.2.0 or above
Upgrade FortiProxy to version 7.0.4 or above

Long-Term Security Practices

Regularly update and patch Fortinet products
Implement network segmentation and access controls for enhanced security

Patching and Updates

Apply the following patches to address the vulnerability:

FortiManager: Version 6.4.8 or above
FortiAnalyzer: Version 6.4.8 or above
FortiOS: Versions 6.2.11, 7.0.6, or 7.2.0 or above
FortiProxy: Versions 2.0.9 or above