CVE-2021-24155 : What You Need to Know

WordPress Backup and Migrate Plugin - Backup Guard before version 1.6.0 allows high privilege users to upload arbitrary files, including PHP ones, leading to remote code execution.

Understanding CVE-2021-24155

This CVE affects the WordPress Backup and Migrate Plugin - Backup Guard before version 1.6.0, exposing systems to potential remote code execution due to improper file validation.

What is CVE-2021-24155?

The vulnerability in the WordPress Backup and Migrate Plugin - Backup Guard before version 1.6.0 allows authenticated high privilege users to upload various files, including PHP files, which can result in remote code execution (RCE).

The Impact of CVE-2021-24155

With this vulnerability, attackers with admin or higher privileges can upload malicious PHP files, leading to a complete compromise of the affected WordPress site. This can result in data theft, unauthorized access, and potential site defacement.

Technical Details of CVE-2021-24155

This section details the specific technical aspects of the CVE.

Vulnerability Description

The issue arises from the plugin not verifying the format and extension of imported files, allowing users to upload PHP files, which can be exploited to achieve remote code execution.

Affected Systems and Versions

Systems running the WordPress Backup and Migrate Plugin - Backup Guard before version 1.6.0 are vulnerable to this exploit. Users with admin or higher privileges are at risk.

Exploitation Mechanism

Attackers can leverage this vulnerability by exploiting the lack of proper file validation in the plugin, enabling them to upload malicious PHP files and execute arbitrary code.

Mitigation and Prevention

To protect systems from CVE-2021-24155, immediate actions and long-term security practices should be implemented.

Immediate Steps to Take

Update the WordPress Backup and Migrate Plugin - Backup Guard to version 1.6.0 or higher immediately.
Monitor and restrict file uploads on the affected plugin to prevent unauthorized file execution.

Long-Term Security Practices

Regularly update all plugins and themes on WordPress sites to ensure the latest security patches are applied.
Implement strict access controls and user privileges to limit the impact of potential vulnerabilities.

Patching and Updates

Stay informed about security updates from WordPress and plugin vendors to quickly address any future vulnerabilities and protect your website.