CVE-2020-21056 Explained : Impact and Mitigation

A Directory Traversal vulnerability in FusionPBX 4.5.7 allows remote attackers to create folders via a specific PHP file.

Understanding CVE-2020-21056

This CVE involves a security issue in FusionPBX version 4.5.7 that enables unauthorized folder creation by exploiting a particular PHP file.

What is CVE-2020-21056?

The vulnerability in FusionPBX 4.5.7 permits a malicious remote user to manipulate the 'folder' variable in the 'app\edit\foldernew.php' file, leading to unauthorized folder creation.

The Impact of CVE-2020-21056

This vulnerability could be exploited by remote attackers to create folders on the system, potentially leading to unauthorized access or further exploitation of the affected system.

Technical Details of CVE-2020-21056

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability allows remote attackers to create folders through the 'folder' variable in the 'app\edit\foldernew.php' file of FusionPBX 4.5.7.

Affected Systems and Versions

FusionPBX 4.5.7

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the 'folder' variable in the specified PHP file to create unauthorized folders.

Mitigation and Prevention

Protecting systems from CVE-2020-21056 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply security patches provided by FusionPBX promptly.
Monitor and restrict access to sensitive files and directories.
Implement proper input validation to prevent directory traversal attacks.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.
Educate users and administrators about secure coding practices and potential threats.

Patching and Updates

Ensure that FusionPBX is updated to a secure version that addresses the Directory Traversal vulnerability.