CVE-2021-21425 : What You Need to Know

A critical vulnerability (CVSS Base Score: 9.3) has been identified in the Grav Admin Plugin version 1.10.7 and earlier. This CVE allows an unauthenticated user to execute specific methods of the administrator controller, resulting in arbitrary YAML file creation or content modification on the system. Successful exploitation can lead to configuration changes and potential code execution. The issue has been resolved in version 1.10.8.

Understanding CVE-2021-21425

This section delves into the details of the vulnerability, its impact, and steps to mitigate the risk.

What is CVE-2021-21425?

The CVE-2021-21425 vulnerability in the Grav Admin Plugin allows unauthenticated users to execute certain methods of the administrator controller without any credentials. This can lead to unauthorized YAML file creation or content alteration, potentially resulting in configuration changes and code execution.

The Impact of CVE-2021-21425

The critical vulnerability has a CVSS Base Score of 9.3, indicating a severe risk. Successful exploitation can result in arbitrary file changes, configuration modifications, and even code execution on the affected system. It poses a significant threat to the confidentiality and integrity of data.

Technical Details of CVE-2021-21425

This section covers the technical aspects of the vulnerability, including how it can be exploited and the systems affected.

Vulnerability Description

The vulnerability allows unauthenticated users to trigger specific methods of the administrator controller, enabling them to create or modify YAML files on the system. This can lead to unauthorized configuration changes, potentially compromising the system's integrity.

Affected Systems and Versions

Grav Admin Plugin versions up to and including 1.10.7 are affected by this vulnerability. Users operating these versions are at risk of unauthorized file modifications and code execution.

Exploitation Mechanism

By exploiting this vulnerability, an attacker can make unauthorized changes to YAML files, potentially altering system configurations and executing malicious code. This could lead to complete system compromise.

Mitigation and Prevention

To safeguard systems from CVE-2021-21425, immediate steps should be taken to address the vulnerability and prevent exploitation.

Immediate Steps to Take

Users should upgrade to version 1.10.8 of the Grav Admin Plugin to mitigate the vulnerability. Additionally, restricting access to the

/admin

path from untrusted sources can help reduce the risk of unauthorized access.

Long-Term Security Practices

Implementing proper access controls, conducting regular security audits, and staying informed about security updates are essential for long-term security.

Patching and Updates

Regularly updating software and plugins, along with monitoring security advisories, can help prevent vulnerabilities and mitigate potential risks.