CVE-2021-22139 : Exploit Details and Defense Strategies

Kibana versions before 7.12.1 have been identified with a denial of service vulnerability in webhook actions, allowing an attacker to disrupt service availability.

Understanding CVE-2021-22139

This CVE discloses the risk associated with running affected Kibana versions, highlighting the potential impact and recommended actions.

What is CVE-2021-22139?

CVE-2021-22139 refers to a denial of service vulnerability present in Kibana versions before 7.12.1 due to a lack of timeout or limitations on request size, enabling a malicious actor to exhaust the connection pool.

The Impact of CVE-2021-22139

Exploiting this vulnerability grants unauthorized access to creating webhook actions, leading to a drain of the Kibana host connection pool, resulting in service unavailability for legitimate users.

Technical Details of CVE-2021-22139

Explore the technical aspects of this vulnerability to better understand the affected systems and mitigation strategies.

Vulnerability Description

The vulnerability allows attackers to create webhook actions without proper safeguards, consuming excessive resources and overwhelming the Kibana host's connection pool.

Affected Systems and Versions

Kibana versions before 7.12.1 are impacted by this vulnerability, necessitating immediate attention from users of Elastic's Kibana.

Exploitation Mechanism

By leveraging the lack of timeout controls or request size limits, attackers can systematically drain the Kibana host connection pool, causing service disruptions.

Mitigation and Prevention

Learn about the crucial steps to secure your systems and prevent potential exploitation of CVE-2021-22139.

Immediate Steps to Take

Users are strongly advised to update their Kibana installations to version 7.12.1 or newer to mitigate the vulnerability and enhance system security.

Long-Term Security Practices

Implement robust access controls, monitoring mechanisms, and regular security updates to protect against similar threats in the future.

Patching and Updates

Stay informed about security advisories from Elastic and promptly apply patches or updates to ensure the resilience of your Kibana deployment.