CVE-2019-16989 : Exploit Details and Defense Strategies

FusionPBX up to version 4.5.7 is vulnerable to cross-site scripting (XSS) due to improper sanitization of the 'c' variable in the 'conference_interactive.php' file.

Understanding CVE-2019-16989

This CVE identifies a security issue in FusionPBX that allows for XSS attacks.

What is CVE-2019-16989?

The vulnerability arises from the lack of proper sanitization of user input, specifically the 'c' variable from the URL, leading to XSS exploitation.

The Impact of CVE-2019-16989

The XSS vulnerability in FusionPBX up to version 4.5.7 can be exploited by attackers to execute malicious scripts in the context of a user's browser, potentially compromising sensitive data.

Technical Details of CVE-2019-16989

FusionPBX vulnerability specifics and affected systems.

Vulnerability Description

The 'conference_interactive.php' file in FusionPBX up to version 4.5.7 fails to sanitize the 'c' variable from the URL, allowing for XSS attacks through unsanitized input.

Affected Systems and Versions

FusionPBX up to version 4.5.7

Exploitation Mechanism

Attackers can inject malicious scripts via the unsanitized 'c' variable in the URL, leading to XSS vulnerabilities.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-16989 vulnerability.

Immediate Steps to Take

Apply the patch provided by FusionPBX to fix 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

Ensure FusionPBX is updated to version 4.5.8 or later to mitigate the XSS vulnerability.