Hadoop cluster web interface
Description
The Hadoop cluster web interface is exposed to the public internet without authentication or access controls. This administrative interface, which provides detailed information about cluster operations, job execution, and system configuration, should only be accessible to authorized administrators within a trusted network environment.
Remediation
Restrict access to the Hadoop cluster web interface using one or more of the following methods:
1. Network-level restrictions: Configure firewall rules or security groups to allow access only from trusted IP ranges or internal networks. Block external access to common Hadoop ports (50070, 8088, 19888, 50030).
2. Enable authentication: Configure Kerberos authentication for Hadoop services to require valid credentials for web interface access.
3. Use a reverse proxy: Place the web interface behind an authenticated reverse proxy (such as Apache with mod_auth or nginx) that enforces authentication before forwarding requests.
4. Disable unnecessary interfaces: If the web interface is not required for operations, disable it entirely in the Hadoop configuration files (hdfs-site.xml, yarn-site.xml).
Verify that access controls are properly configured by attempting to access the interface from an external network.