CVE-2020-36388 : Security Advisory and Response

CiviCRM before version 5.21.3 and versions 5.22.x through 5.24.x before 5.24.3 are vulnerable to a crafted PHAR archive upload and execution.

Understanding CVE-2020-36388

This CVE identifies a security vulnerability in CiviCRM that allows users to upload and execute a malicious PHAR archive.

What is CVE-2020-36388?

CiviCRM versions prior to 5.21.3 and between 5.22.x to 5.24.x before 5.24.3 are susceptible to a specific type of attack involving the upload and execution of a specially crafted PHAR archive.

The Impact of CVE-2020-36388

This vulnerability could lead to unauthorized code execution on the affected system, potentially resulting in data breaches, system compromise, and other security risks.

Technical Details of CVE-2020-36388

Vulnerability Description

The issue allows users to upload and execute a malicious PHAR archive, enabling attackers to run arbitrary code on the system.

Affected Systems and Versions

CiviCRM versions before 5.21.3
CiviCRM versions 5.22.x to 5.24.x before 5.24.3

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading a specially crafted PHAR archive to the system, which, when executed, can trigger malicious actions.

Mitigation and Prevention

Immediate Steps to Take

Upgrade CiviCRM to version 5.24.3 or later to mitigate the vulnerability.
Implement strict file upload controls to prevent the upload of malicious files.

Long-Term Security Practices

Regularly update and patch CiviCRM to address security vulnerabilities.
Conduct security audits and penetration testing to identify and remediate potential weaknesses.

Patching and Updates

Apply security patches and updates provided by CiviCRM promptly to protect against known vulnerabilities.