CVE-2020-21055 : What You Need to Know

A Directory Traversal vulnerability in FusionPBX 4.5.7 allows malicious users to rename system files via specific variables in a PHP file.

Understanding CVE-2020-21055

This CVE involves a security issue in FusionPBX version 4.5.7 that enables unauthorized users to manipulate file names within the system.

What is CVE-2020-21055?

The vulnerability allows attackers to rename any file on the system using certain variables in the 'filerename.php' file of FusionPBX 4.5.7.

The Impact of CVE-2020-21055

This vulnerability could lead to unauthorized access and manipulation of critical system files, potentially causing data loss or system compromise.

Technical Details of CVE-2020-21055

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

Vulnerability Description

The flaw in FusionPBX 4.5.7 enables malicious users to rename files by exploiting specific variables in the 'filerename.php' file.

Affected Systems and Versions

Affected Version: FusionPBX 4.5.7
Other versions may also be impacted, so users should exercise caution.

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating the 'folder,' 'filename,' and 'newfilename' variables in the 'filerename.php' file.

Mitigation and Prevention

Protecting systems from CVE-2020-21055 requires immediate action and long-term security measures.

Immediate Steps to Take

Update FusionPBX to the latest version to patch the vulnerability.
Monitor system files for any unauthorized changes.

Long-Term Security Practices

Implement access controls to restrict file manipulation permissions.
Regularly audit and review file renaming activities for anomalies.

Patching and Updates

Apply security patches promptly to prevent exploitation of known vulnerabilities.