CVE-2019-16983 : Security Advisory and Response

FusionPBX up to version 4.5.7 is vulnerable to cross-site scripting (XSS) due to an unsanitized 'param' variable in the resources\paging.php file.

Understanding CVE-2019-16983

This CVE involves a security issue in FusionPBX that could allow an attacker to execute malicious scripts on the victim's browser.

What is CVE-2019-16983?

In FusionPBX versions prior to 4.5.7, the 'param' variable in the resources\paging.php file is not properly sanitized, enabling an XSS vulnerability.

The Impact of CVE-2019-16983

The XSS vulnerability could be exploited by an attacker to inject and execute malicious scripts within the context of the affected FusionPBX interface.

Technical Details of CVE-2019-16983

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The 'param' variable in the resources\paging.php file of FusionPBX is constructed from URL arguments and reflected in HTML without proper sanitization, leading to a cross-site scripting vulnerability.

Affected Systems and Versions

FusionPBX versions up to 4.5.7

Exploitation Mechanism

Attackers can craft malicious URLs containing script payloads that, when executed, can compromise the integrity of the FusionPBX interface.

Mitigation and Prevention

Protect your systems from CVE-2019-16983 with the following measures:

Immediate Steps to Take

Update FusionPBX to version 4.5.7 or later to patch the XSS vulnerability.
Regularly monitor and sanitize user inputs to prevent XSS attacks.

Long-Term Security Practices

Conduct regular security audits and code reviews to identify and address vulnerabilities.
Educate developers on secure coding practices to prevent similar issues in the future.

Patching and Updates

Stay informed about security updates and patches released by FusionPBX to address vulnerabilities like CVE-2019-16983.