CVE-2020-11476 Explained : Impact and Mitigation

Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type such as a .phar file.

Understanding CVE-2020-11476

Concrete5 before version 8.5.3 is vulnerable to Unrestricted File Upload attacks, potentially allowing malicious actors to upload dangerous file types like .phar files.

What is CVE-2020-11476?

This CVE refers to a security vulnerability in Concrete5 that enables attackers to upload files with dangerous types, posing a risk to the system's security.

The Impact of CVE-2020-11476

The vulnerability could lead to arbitrary code execution, unauthorized access, and potential compromise of the affected system.

Technical Details of CVE-2020-11476

Concrete5 CVE-2020-11476 involves the following technical aspects:

Vulnerability Description

Concrete5 before 8.5.3 allows Unrestricted Upload of File with Dangerous Type, such as a .phar file, which can be exploited by attackers.

Affected Systems and Versions

Product: Concrete5
Vendor: Not applicable
Versions affected: All versions before 8.5.3

Exploitation Mechanism

The vulnerability can be exploited by uploading malicious files, such as .phar files, which may execute arbitrary code on the server.

Mitigation and Prevention

To address CVE-2020-11476, consider the following mitigation strategies:

Immediate Steps to Take

Update Concrete5 to version 8.5.3 or later to mitigate the vulnerability.
Restrict file upload permissions to trusted users only.
Monitor file uploads for suspicious activity.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement file type restrictions and validation checks for uploaded files.
Conduct security training for users to raise awareness about safe file handling practices.

Patching and Updates

Ensure timely installation of security patches and updates provided by Concrete5 to address vulnerabilities like CVE-2020-11476.