CVE-2019-16969 : Exploit Details and Defense Strategies

FusionPBX before version 4.5.7 is vulnerable to a cross-site scripting (XSS) issue due to unsanitized input in the app\fifo_list\fifo_interactive.php file.

Understanding CVE-2019-16969

This CVE involves a security vulnerability in FusionPBX that could allow for XSS attacks.

What is CVE-2019-16969?

CVE-2019-16969 is a vulnerability in FusionPBX versions prior to 4.5.7 that arises from improper sanitization of user input, potentially leading to cross-site scripting (XSS) attacks.

The Impact of CVE-2019-16969

The vulnerability in FusionPBX could be exploited by attackers to inject malicious scripts into web pages viewed by other users, leading to various attacks such as session hijacking, defacement, and data theft.

Technical Details of CVE-2019-16969

This section provides more technical insights into the CVE.

Vulnerability Description

The file app\fifo_list\fifo_interactive.php in FusionPBX up to version 4.5.7 does not properly sanitize the "c" variable from the URL, allowing for potential XSS attacks through unsanitized input.

Affected Systems and Versions

FusionPBX versions before 4.5.7

Exploitation Mechanism

The vulnerability can be exploited by injecting malicious scripts through the unsanitized "c" variable in the URL, which then get reflected in the HTML, enabling XSS attacks.

Mitigation and Prevention

Protecting systems from CVE-2019-16969 requires immediate actions and long-term security measures.

Immediate Steps to Take

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

Long-Term Security Practices

Implement input validation and output encoding to prevent XSS vulnerabilities.
Educate developers on secure coding practices to avoid similar issues in the future.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.