CVE-2021-29262 : Vulnerability Insights and Analysis
Learn about CVE-2021-29262, a vulnerability in Apache Solr that allows leakage of authentication and authorization settings due to misapplied Zookeeper ACLs. Find out the impact, technical details, affected systems, exploitation mechanism, mitigation steps, and preventive measures.
An Apache Solr vulnerability CVE-2021-29262 allows leakage of authentication and authorization settings in versions prior to 8.8.2 configured with certain ACLProviders.
Understanding CVE-2021-29262
This CVE identifies a vulnerability in Apache Solr that can lead to leakage of configured authentication and authorization settings due to misapplied Zookeeper ACLs.
What is CVE-2021-29262?
The vulnerability in Apache Solr versions prior to 8.8.2 can result in sensitive paths becoming readable when certain ACLProviders are misconfigured. Existing security.json nodes may not have their ACLs updated automatically, leading to potential data leakage.
The Impact of CVE-2021-29262
The misconfiguration of Zookeeper ACLs in Apache Solr can allow unauthorized access to sensitive authentication and authorization settings, jeopardizing the security and confidentiality of data stored within the affected system.
Technical Details of CVE-2021-29262
This section outlines specific technical details related to the CVE-2021-29262 vulnerability.
Vulnerability Description
When starting Apache Solr versions before 8.8.2 with specific ACLProviders and no existing security.json znode, misconfigured ACLs can make sensitive paths readable. Additionally, existing security.json nodes may not have their ACLs updated automatically.
Affected Systems and Versions
Apache Solr versions prior to 8.8.2 configured with SaslZkACLProvider or VMParamsAllAndReadonlyDigestZkACLProvider are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by gaining unauthorized access to sensitive information stored in the misconfigured security.json znodes.
Mitigation and Prevention
To address CVE-2021-29262, immediate steps and long-term security practices are necessary to secure Apache Solr deployments.
Immediate Steps to Take
Manually set appropriate ACLs on the /security.json znode to restrict unauthorized access and prevent leakage of sensitive information.
Long-Term Security Practices
Regularly review and update ACL configurations, conduct security audits, and implement least privilege access controls to prevent unauthorized access to critical system components.
Patching and Updates
Update Apache Solr to version 8.8.2 or later to mitigate the vulnerability and ensure that ACLs are correctly applied to sensitive paths.