CVE-2021-29943 : Security Advisory and Response

Apache Solr Unprivileged users may be able to perform unauthorized read/write to collections.

Understanding CVE-2021-29943

This CVE impacts Apache Solr versions prior to 8.8.2, allowing unprivileged users to carry out unauthorized read/write operations on collections.

What is CVE-2021-29943?

Apache Solr versions before 8.8.2 could allow unauthorized read/write operations on collections by unprivileged users when using ConfigurableInternodeAuthHadoopPlugin for authentication.

The Impact of CVE-2021-29943

The vulnerability could lead to incorrect authorization resolutions on the receiving hosts, potentially enabling unauthorized access to sensitive data.

Technical Details of CVE-2021-29943

This section delves into the specifics of the CVE.

Vulnerability Description

The vulnerability in Apache Solr versions prior to 8.8.2 allowed unprivileged users to perform unauthorized read/write operations on collections, exploiting authentication mechanisms.

Affected Systems and Versions

Apache Solr versions less than 8.8.2 are impacted by this vulnerability, specifically when using ConfigurableInternodeAuthHadoopPlugin.

Exploitation Mechanism

By forwarding/proxying distributed requests using server credentials instead of original client credentials, the vulnerability permits unauthorized operations on collections.

Mitigation and Prevention

To safeguard your systems from CVE-2021-29943, certain steps should be followed.

Immediate Steps to Take

Ensure Apache Solr is updated to version 8.8.2 or above. Implement proper authentication and authorization mechanisms to restrict unauthorized access.

Long-Term Security Practices

Regularly monitor and update Apache Solr to the latest secure versions. Enforce least privilege access policies and conduct security audits.

Patching and Updates

Apply patches provided by Apache Software Foundation to address the vulnerability and enhance system security.