CVE-2021-26814 : Exploit Details and Defense Strategies

Wazuh API in Wazuh from 4.0.0 to 4.0.3 allows authenticated users to execute arbitrary code with administrative privileges via /manager/files URI. An authenticated user to the service may exploit incomplete input validation on the /manager/files API to inject arbitrary code within the API service script.

Understanding CVE-2021-26814

This section provides insight into the impact and technical details of the CVE.

What is CVE-2021-26814?

CVE-2021-26814 is a vulnerability in Wazuh API that enables authenticated users to run arbitrary code with admin permissions by leveraging vulnerabilities in the /manager/files URI.

The Impact of CVE-2021-26814

The vulnerability allows attackers with authenticated access to the service to inject malicious code into the API service script, potentially leading to unauthorized access and control of the system.

Technical Details of CVE-2021-26814

This section delves deeper into the technical aspects of the vulnerability.

Vulnerability Description

The flaw in the Wazuh API from version 4.0.0 to 4.0.3 results from inadequate input validation on the /manager/files API, enabling attackers to execute arbitrary code with elevated privileges.

Affected Systems and Versions

All systems running Wazuh versions between 4.0.0 and 4.0.3 are vulnerable to exploitation.

Exploitation Mechanism

Exploitation involves authenticated users utilizing the incomplete input validation on the /manager/files API to insert and execute arbitrary code within the API service script.

Mitigation and Prevention

This section outlines necessary steps to address the CVE and prevent future occurrences.

Immediate Steps to Take

Users are advised to update their Wazuh installations to version 4.0.4 or later to mitigate the vulnerability and prevent unauthorized code execution.

Long-Term Security Practices

Implementing stringent input validation mechanisms and regular security audits can help in identifying and fixing similar vulnerabilities in the future.

Patching and Updates

Regularly applying security patches and staying up-to-date with software versions can ensure protection against known vulnerabilities.