CVE-2019-11816 Explained : Impact and Mitigation

A vulnerability related to access control has been identified in OPNsense versions prior to 19.1.8 and pfsense versions prior to 2.4.4-p3. This vulnerability enables remote authenticated users to exploit privileges and gain administrator-level access by sending a specially designed request.

Understanding CVE-2019-11816

This CVE-2019-11816 vulnerability pertains to incorrect access control in the WebUI of OPNsense and pfsense, allowing authenticated remote users to escalate their privileges to administrator status through a crafted request.

What is CVE-2019-11816?

The CVE-2019-11816 vulnerability involves a flaw in access control mechanisms in OPNsense and pfsense, enabling authenticated remote users to elevate their privileges to administrator level.

The Impact of CVE-2019-11816

This vulnerability poses a significant risk as it allows remote authenticated users to gain unauthorized administrator-level access, potentially leading to malicious activities and compromise of the system.

Technical Details of CVE-2019-11816

This section provides technical details regarding the vulnerability.

Vulnerability Description

The vulnerability in OPNsense versions before 19.1.8 and pfsense versions before 2.4.4-p3 allows remote authenticated users to exploit privileges and gain administrator-level access through a specially crafted request.

Affected Systems and Versions

OPNsense versions prior to 19.1.8
Pfsense versions prior to 2.4.4-p3

Exploitation Mechanism

Remote authenticated users can exploit this vulnerability by sending a specifically designed request, enabling them to escalate their privileges to administrator level.

Mitigation and Prevention

To address and prevent the CVE-2019-11816 vulnerability, follow these steps:

Immediate Steps to Take

Update OPNsense to version 19.1.8 or later
Update pfsense to version 2.4.4-p3 or later
Monitor system logs for any suspicious activities

Long-Term Security Practices

Implement strong password policies
Enforce multi-factor authentication
Regularly review and update access control policies

Patching and Updates

Apply security patches promptly
Stay informed about security updates from OPNsense and pfsense