CVE-2021-24123 : Security Advisory and Response

PowerPress WordPress plugin versions before 8.3.8 are affected by an arbitrary file upload vulnerability that allows high privilege accounts to upload arbitrary files, potentially leading to remote code execution (RCE).

Understanding CVE-2021-24123

This CVE involves the PowerPress WordPress plugin version prior to 8.3.8, enabling authenticated users with high privileges to upload files that can result in remote code execution.

What is CVE-2021-24123?

CVE-2021-24123 is an arbitrary file upload vulnerability found in the PowerPress WordPress plugin versions earlier than 8.3.8. It allows users with admin+ privileges to upload malicious files like PHP, leading to RCE.

The Impact of CVE-2021-24123

The vulnerability permits attackers with high privilege accounts to upload harmful files, potentially compromising the target system's security and allowing for unauthorized remote code execution.

Technical Details of CVE-2021-24123

This section provides insights into the vulnerability's description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

Arbitrary file upload in PowerPress WordPress plugin versions before 8.3.8 allows admin+ users to upload unauthorized files, leading to potential RCE attacks.

Affected Systems and Versions

The vulnerability affects PowerPress WordPress plugin versions prior to 8.3.8 and is exploited by admin+ users on the affected systems.

Exploitation Mechanism

Attackers exploit the lack of validation on feed images uploads in the Podcast Artwork section, enabling the upload of arbitrary files like PHP to execute remote code.

Mitigation and Prevention

To secure systems and prevent exploitation of CVE-2021-24123, immediate actions and long-term security practices are recommended.

Immediate Steps to Take

Update PowerPress plugin to version 8.3.8 or above to patch the vulnerability.
Monitor file uploads and restrict access to sensitive directories.

Long-Term Security Practices

Regularly update plugins and themes to mitigate known vulnerabilities.
Implement least privilege access controls and user permissions to limit file upload capabilities.

Patching and Updates

Frequently check for security updates from plugin developers and apply them promptly to ensure protection against known vulnerabilities.