CVE-2021-24154 : Exploit Details and Defense Strategies

The Theme Editor WordPress plugin before version 2.6 is vulnerable to an authenticated arbitrary file download exploit, allowing administrators to download arbitrary files on the web server.

Understanding CVE-2021-24154

This CVE identifies a security flaw in the Theme Editor plugin for WordPress that could be exploited by authenticated users to download sensitive files on the server.

What is CVE-2021-24154?

The CVE-2021-24154 vulnerability in Theme Editor WordPress plugin (before 2.6) allows administrators to download arbitrary files on the server by not properly validating the GET file parameter.

The Impact of CVE-2021-24154

The impact of this vulnerability is significant as it enables malicious users to access sensitive files such as /etc/passwd on the web server, potentially leading to further exploitation.

Technical Details of CVE-2021-24154

The technical details of CVE-2021-24154 include:

Vulnerability Description

The flaw arises from the lack of validation of the GET file parameter, which is directly passed to the download_file() function in the plugin, enabling unauthorized file downloads.

Affected Systems and Versions

Theme Editor plugin versions prior to 2.6 are affected by this vulnerability, leaving them open to exploitation by authenticated users.

Exploitation Mechanism

By manipulating the file parameter in the plugin's functionality, attackers can bypass security measures and download sensitive server files.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-24154, follow these security measures:

Immediate Steps to Take

Update Theme Editor plugin to version 2.6 or newer to patch the vulnerability.
Restrict admin access and monitor file downloads for suspicious activities.

Long-Term Security Practices

Regularly update plugins and WordPress core to prevent future vulnerabilities.
Implement strong access controls and user permissions to limit file access.

Patching and Updates

Stay informed about security updates and patches released by the plugin developer to address known vulnerabilities.