CVE-2019-16974 : Exploit Details and Defense Strategies

An XSS vulnerability exists in versions of FusionPBX prior to 4.5.7 due to the use of an unsanitized "id" variable from the URL in the file app\contacts\contact_times.php. This variable is reflected in the generated HTML, allowing for potential exploitation.

Understanding CVE-2019-16974

In FusionPBX up to version 4.5.7, a specific file is vulnerable to XSS attacks due to improper handling of user input.

What is CVE-2019-16974?

This CVE identifies a cross-site scripting (XSS) vulnerability in FusionPBX versions before 4.5.7, allowing attackers to inject malicious scripts into web pages viewed by other users.

The Impact of CVE-2019-16974

The vulnerability can lead to unauthorized access, data theft, and potential manipulation of content on affected FusionPBX instances.

Technical Details of CVE-2019-16974

The technical aspects of the vulnerability and its implications.

Vulnerability Description

The XSS flaw in FusionPBX versions prior to 4.5.7 stems from the unsanitized "id" variable in the file app\contacts\contact_times.php, which is directly reflected in the HTML output.

Affected Systems and Versions

FusionPBX versions before 4.5.7

Exploitation Mechanism

Attackers can craft URLs with malicious scripts in the "id" parameter, which are then executed in the context of the user's session, potentially compromising sensitive data.

Mitigation and Prevention

Measures to address and prevent the exploitation of CVE-2019-16974.

Immediate Steps to Take

Upgrade FusionPBX to version 4.5.7 or later to mitigate the vulnerability.
Implement input validation and output encoding to prevent XSS attacks.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security audits and penetration testing to identify and remediate potential weaknesses.

Patching and Updates

Stay informed about security advisories and apply patches promptly to secure systems against known vulnerabilities.