cis-tomcat10-v110-10.6

DevOps & Security

Enable strict servlet Compliance (Manual)

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10.6 Enable strict servlet Compliance (Manual)

Description

The STRICT_SERVLET_COMPLIANCE influences Tomcat's behavior in several subtle ways. See the References below for the complete list. It is recommended that STRICT_SERVLET_COMPLIANCE be set to true.

Rationale

When STRICT_SERVLET_COMPLIANCE is set to true, Tomcat will always send an HTTP Content-type header when responding to requests. This is significant as the behavior of web browsers is inconsistent in the absence of the Content-type header. Some browsers will attempt to determine the appropriate content-type by sniffing

Impact

Changing this to true will change a number of other default values which is likely to break the majority of systems as some browsers are unable to correctly handle the cookie headers that result from a strict adherence to the specifications. Please refer to the referenced documentation for a complete list of changed values. Defaults, regardless of whether or not they have been changed by setting org.apache.catalina.STRICT_SERVLET_COMPLIANCE can always be overridden by explicitly setting the appropriate system property or element attribute.

Audit Procedure

Ensure the -Dorg.apache.catalina.STRICT_SERVLET_COMPLIANCE=true parameter is added to the startup script which by default is located at $CATALINA_HOME/bin/catalina.sh.

Remediation

Start Tomcat with strict compliance enabled, add -Dorg.apache.catalina.STRICT_SERVLET_COMPLIANCE=true to your startup script.

Default Value

The default value is false.

References

http://tomcat.apache.org/tomcat-9.0-doc/config/systemprops.html

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	13.10 Perform Application Layer FilteringPerform application layer filtering. Example implementations include a filtering proxy, application layer firewall, or gateway.			●
v7	5.1 Establish Secure ConfigurationsMaintain documented, standard security configuration standards for all authorized operating systems and software.	●	●	●

Profile

Level 2