CVE-2021-43063 : Security Advisory and Response

A vulnerability in Fortinet FortiWeb versions allows attackers to execute unauthorized code via crafted HTTP requests.

Understanding CVE-2021-43063

What is CVE-2021-43063?

An improper neutralization of input during web page generation ('cross-site scripting') in Fortinet FortiWeb versions enables attackers to execute unauthorized code or commands through specially crafted HTTP requests.

The Impact of CVE-2021-43063

The vulnerability has a CVSS base score of 5.8, indicating a medium severity issue that requires user interaction. Attackers can exploit this vulnerability to execute unauthorized code or commands, potentially compromising confidentiality and integrity.

Technical Details of CVE-2021-43063

Vulnerability Description

A cross-site scripting vulnerability in Fortinet FortiWeb versions 6.4.1, 6.4.0, 6.3.15, and below allows for unauthorized code execution via manipulated HTTP GET requests to the login page.

Affected Systems and Versions

Fortinet FortiWeb 6.4.1, 6.4.0, 6.3.15, and below
Versions 6.2.6 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted HTTP GET requests to the FortiWeb login page, allowing them to inject and execute unauthorized code.

Mitigation and Prevention

Immediate Steps to Take

Apply patches and updates provided by Fortinet promptly.
Implement strict input validation mechanisms to mitigate the risk of cross-site scripting attacks.

Long-Term Security Practices

Regularly monitor and audit web application logs for suspicious activities.
Conduct security training for web developers on secure coding practices.

Patching and Updates

Keep Fortinet FortiWeb versions up to date with the latest security patches and fixes to address this vulnerability.