CVE-2021-43073 : Security Advisory and Response

This CVE-2021-43073 article provides insights into an os command injection vulnerability affecting Fortinet FortiWeb versions.

Understanding CVE-2021-43073

What is CVE-2021-43073?

CVE-2021-43073 is an os command injection vulnerability present in Fortinet FortiWeb versions 6.4.1 and 6.4.0, as well as versions 6.3.15 and below, and version 6.2.6 and below. It allows attackers to execute unauthorized code or commands via crafted HTTP requests.

The Impact of CVE-2021-43073

The impact of this vulnerability is significant:

CVSS Base Score: 8.8 (High)
CVSS Temporal Score: 8.3 (High)
Attack Vector: Network
Attack Complexity: Low
Confidentiality, Integrity, and Availability Impact: High
Exploit Code Maturity: Proof of Concept
User Interaction: None
Privileges Required: Low

Technical Details of CVE-2021-43073

Vulnerability Description

The vulnerability arises from improper neutralization of special elements used in an os command. It leads to os command injection in Fortinet FortiWeb, enabling unauthorized code execution via malicious HTTP requests.

Affected Systems and Versions

Fortinet FortiWeb 6.4.1 and 6.4.0
Fortinet FortiWeb 6.3.15 and below
Fortinet FortiWeb 6.2.6 and below

Exploitation Mechanism

The vulnerability permits attackers to execute malicious commands through carefully constructed HTTP requests.

Mitigation and Prevention

Immediate Steps to Take

Apply patches provided by Fortinet promptly.
Implement network security measures to detect and block malicious HTTP requests.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch Fortinet FortiWeb to the latest versions.
Conduct security audits and assessments to identify vulnerabilities proactively.

Patching and Updates

Timely installation of patches and updates from Fortinet is crucial to address the CVE-2021-43073 vulnerability.