CVE-2019-16667 : Vulnerability Insights and Analysis

In pfSense version 2.4.4-p3, a vulnerability exists in the diag_command.php file that allows for Cross-Site Request Forgery (CSRF) attacks. This flaw can be exploited through specific fields, enabling the execution of operating system commands.

Understanding CVE-2019-16667

This CVE entry pertains to a CSRF vulnerability in pfSense version 2.4.4-p3 that can lead to the execution of unauthorized OS commands.

What is CVE-2019-16667?

CVE-2019-16667 is a security vulnerability found in the diag_command.php file of pfSense version 2.4.4-p3. It allows attackers to perform CSRF attacks through certain fields, potentially leading to the execution of malicious commands on the system.

The Impact of CVE-2019-16667

This vulnerability could be exploited by malicious actors to execute unauthorized operating system commands, potentially compromising the security and integrity of the affected system.

Technical Details of CVE-2019-16667

This section provides more in-depth technical details regarding the vulnerability.

Vulnerability Description

The vulnerability in diag_command.php in pfSense 2.4.4-p3 allows for CSRF attacks via specific fields, enabling the execution of OS commands. The issue arises from the csrf_callback() function generating an error message when a CSRF token is missing.

Affected Systems and Versions

System: pfSense version 2.4.4-p3
Versions: Not applicable

Exploitation Mechanism

The vulnerability can be exploited through the txtCommand or txtRecallBuffer fields, allowing attackers to execute unauthorized OS commands.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks associated with CVE-2019-16667.

Immediate Steps to Take

Update pfSense to a patched version that addresses the CSRF vulnerability.
Implement proper input validation mechanisms to prevent CSRF attacks.

Long-Term Security Practices

Regularly monitor and audit web application logs for any suspicious activities.
Educate users and administrators about CSRF attacks and best security practices.

Patching and Updates

Ensure that all systems running pfSense are regularly updated with the latest security patches to prevent exploitation of known vulnerabilities.