CVE-2019-16964 : Exploit Details and Defense Strategies

FusionPBX version up to 4.5.7 is vulnerable to a command injection flaw in the Call Center Queue Module, allowing authenticated attackers to execute arbitrary commands on the host.

Understanding CVE-2019-16964

This CVE involves a security vulnerability in FusionPBX that enables attackers to run unauthorized commands on the affected system.

What is CVE-2019-16964?

The Call Center Queue Module in FusionPBX up to version 4.5.7 is susceptible to a command injection vulnerability due to inadequate input validation. This flaw permits authenticated attackers with specific permissions to execute arbitrary commands on the host.

The Impact of CVE-2019-16964

The vulnerability allows attackers to run commands with the privileges of the www-data user, potentially leading to unauthorized access and control of the affected system.

Technical Details of CVE-2019-16964

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability exists in the app/call_centers/cmd.php file of FusionPBX, enabling attackers to inject and execute commands on the host.

Affected Systems and Versions

FusionPBX versions up to 4.5.7

Exploitation Mechanism

Attackers with the permissions call_center_queue_add or call_center_queue_edit can exploit the vulnerability to execute arbitrary commands on the host.

Mitigation and Prevention

Protecting systems from CVE-2019-16964 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update FusionPBX to a patched version that addresses the command injection vulnerability.
Restrict access to the vulnerable module to authorized personnel only.

Long-Term Security Practices

Implement strict input validation mechanisms in all web applications to prevent command injection attacks.
Regularly monitor and audit system logs for any suspicious activities.

Patching and Updates

Apply security patches provided by FusionPBX promptly to mitigate the vulnerability and enhance system security.