CIS Benchmark for Apache Tomcat: Hardening Guide

What the official CIS Benchmark covers

CIS publishes versioned Apache Tomcat benchmarks (for example Tomcat 9 v1.2.0 and Tomcat 10 v1.1.0). Published sections include:

• Remove Extraneous Resources
• Limit Server Platform Information Leaks
• Protect the Shutdown Port
• Protect Tomcat Configurations
• Configure Realms
• Connector Security
• Establish and Protect Logging Facilities
• Configure Catalina Policy
• Application Deployment
• Miscellaneous Configuration Settings

Key hardening areas

Mapped to real CIS Tomcat sections, without listing individual recommendation IDs:

Remove defaults & hide banner

Remove docs, examples, and unused manager resources; reduce server.info, X-Powered-By, and TRACE disclosure themes.

Shutdown port & filesystem ACLs

Nondeterministic or disabled shutdown port, plus restrictive CATALINA_HOME/BASE and configuration directory permissions.

Realms & authentication

Secure realm configuration and avoiding insecure memory realms for production authentication themes.

Connector TLS

SSLEnabled connectors, accurate scheme/secure attributes, and strong sslProtocol expectations.

Logging, catalina.policy & deployment

Protected logging facilities, Catalina policy, and controlled auto-deploy or manager application themes.

Why manual CIS hardening is hard at scale

• Per-application server.xml forks diverge from the golden baseline.
• Using the wrong Tomcat major-version PDF produces misleading pass rates.
• Container images reintroduce examples and manager apps after rebuilds.
• TLS offload confuses connector secure and scheme attributes.

How CyberSilo’s CIS Benchmarking Tool helps

CyberSilo’s CIS Benchmarking Tool is built to turn “we have a PDF” into continuous configuration assessment:

• Map Tomcat instances into an assessable inventory against CIS Benchmark expectations for the platform.
• Score posture and surface gaps across connectors, realms, logging, and deployment themes.
• Detect configuration drift after application releases instead of waiting for the next audit scramble.
• Prioritise remediation work and keep exportable evidence for programmes that expect a hardened Tomcat baseline.

FAQ

Is there an official CIS Benchmark for Apache Tomcat?

Yes. CIS publishes versioned Tomcat benchmarks. Use the edition that matches your Tomcat major version.

Is this the same as Apache HTTP Server?

No. Apache HTTP Server and Apache Tomcat are separate CIS families. Use the matching benchmark for each.

What about the manager application?

Manager and related default apps appear under extraneous resources and deployment themes. Follow applicability notes in your PDF.

How does CyberSilo relate to the official CIS PDF?

The official CIS Benchmark remains the authoritative recommendation source. CyberSilo automates assessment, scoring, drift detection, and remediation tracking.