CVE-2021-22135 : What You Need to Know
Learn about CVE-2021-22135, a vulnerability in Elasticsearch versions before 7.11.2 and 6.8.15 that exposes sensitive information when Document and Field Level Security features are enabled. Find out the impact, affected systems, exploitation method, and mitigation steps.
Elasticsearch versions before 7.11.2 and 6.8.15 have a document disclosure flaw in the Elasticsearch suggester and profile API when Document and Field Level Security are active. This flaw could expose sensitive information to unauthorized actors.
Understanding CVE-2021-22135
This section provides insights into the nature and impact of the CVE-2021-22135 vulnerability.
What is CVE-2021-22135?
CVE-2021-22135 relates to a document disclosure flaw found in Elasticsearch versions before 7.11.2 and 6.8.15. When Document and Field Level Security are enabled, unauthorized actors may gain access to sensitive information via the Elasticsearch suggester and profile API.
The Impact of CVE-2021-22135
The vulnerability could allow attackers to bypass security measures and access documents and fields they are not authorized to view, compromising the confidentiality of sensitive data.
Technical Details of CVE-2021-22135
In this section, the technical aspects of the CVE-2021-22135 vulnerability are explored.
Vulnerability Description
Elasticsearch versions before 7.11.2 and 6.8.15 are susceptible to a document disclosure flaw in the suggester and profile API when Document and Field Level Security settings are enforced. This flaw can be exploited to reveal restricted data.
Affected Systems and Versions
Systems running Elasticsearch versions prior to 7.11.2 and 6.8.15 with Document and Field Level Security features enabled are affected by CVE-2021-22135.
Exploitation Mechanism
By sending specific queries, attackers can enable the profiler and suggester in Elasticsearch, thereby exposing sensitive data that should be protected.
Mitigation and Prevention
This section outlines steps to mitigate the risks associated with CVE-2021-22135.
Immediate Steps to Take
To address this vulnerability, users should update their Elasticsearch installations to versions 7.11.2 or 6.8.15 or later. Additionally, review and adjust security configurations to prevent unauthorized access.
Long-Term Security Practices
Implement a robust access control policy, regularly update Elasticsearch to the latest versions, and conduct security audits to detect and address similar vulnerabilities.
Patching and Updates
Stay informed about security advisories from Elastic and promptly apply patches and updates to secure your Elasticsearch deployment.