CVE-2019-16985 : What You Need to Know

FusionPBX up to version 4.5.7 is vulnerable to arbitrary file deletion due to unsanitized user input in the xml_cdr_delete.php file.

Understanding CVE-2019-16985

In this CVE, a vulnerability in FusionPBX allows an attacker to delete arbitrary files within the system.

What is CVE-2019-16985?

The issue arises from the file xml_cdr_delete.php in FusionPBX versions prior to v4.5.7, where a user-controlled parameter is not properly sanitized, leading to potential file deletion.

The Impact of CVE-2019-16985

Exploitation of this vulnerability could result in unauthorized deletion of critical files, potentially disrupting system functionality and compromising data integrity.

Technical Details of CVE-2019-16985

This section delves into the specifics of the vulnerability.

Vulnerability Description

The file xml_cdr_delete.php in FusionPBX versions before v4.5.7 processes a user-supplied parameter without proper validation, allowing attackers to delete files.

Affected Systems and Versions

FusionPBX versions up to v4.5.7

Exploitation Mechanism

Attackers can manipulate the 'rec' variable in the URL, which is base64 decoded by the system, enabling them to delete files.

Mitigation and Prevention

Protecting systems from CVE-2019-16985 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 system logs for any suspicious activities.

Long-Term Security Practices

Implement input validation mechanisms to sanitize user inputs effectively.
Conduct regular security audits and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

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