CVE-2021-41821 Explained : Impact and Mitigation

Wazuh Manager in Wazuh through 4.1.5 is affected by a remote Integer Underflow vulnerability that might lead to denial of service. A crafted message must be sent from an authenticated agent to the manager.

Understanding CVE-2021-41821

Wazuh Manager in Wazuh through 4.1.5 is susceptible to a remote Integer Underflow vulnerability that can result in denial of service when a specially crafted message is transmitted from an authenticated agent to the manager.

What is CVE-2021-41821?

The CVE-2021-41821 vulnerability is an Integer Underflow flaw in Wazuh Manager within Wazuh versions up to 4.1.5. This vulnerability could be exploited by a malicious actor to trigger a denial of service condition on the affected system.

The Impact of CVE-2021-41821

The exploitation of CVE-2021-41821 could result in a denial of service (DoS) situation where the Wazuh Manager becomes unresponsive, impacting the availability and functionality of the system.

Technical Details of CVE-2021-41821

Wazuh Manager in Wazuh through 4.1.5 is affected by a remote Integer Underflow vulnerability that can lead to denial of service when a specific message is sent from an authenticated agent to the manager.

Vulnerability Description

The vulnerability involves an Integer Underflow in the Wazuh Manager software, allowing an attacker to disrupt the service by sending a specially crafted message from an authenticated agent to the manager.

Affected Systems and Versions

Product: Wazuh
Vendor: Wazuh
Versions Affected: Up to 4.1.5

Exploitation Mechanism

To exploit this vulnerability, an authenticated agent needs to send a meticulously crafted message to the Wazuh Manager, triggering the Integer Underflow and potentially causing a denial of service.

Mitigation and Prevention

It is crucial to take immediate and long-term measures to mitigate the risks associated with CVE-2021-41821.

Immediate Steps to Take

Update Wazuh Manager to the latest version available that includes a patch for this vulnerability.
Monitor network traffic for any suspicious activity that could indicate exploitation attempts.
Implement strong authentication mechanisms to prevent unauthorized access to the Wazuh Manager.

Long-Term Security Practices

Regularly update and patch software to fix known vulnerabilities and enhance security posture.
Conduct security audits and assessments to identify and address potential weaknesses in the system.

Patching and Updates

Check the Wazuh documentation for specific instructions on patching or updating to secure versions that address CVE-2021-41821.