cis-tomcat8-v100-10.8

DevOps & Security

Do not allow additional path delimiters (Manual)

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10.8 Do not allow additional path delimiters (Manual)

Description

Being able to specify different path-delimiters on Tomcat creates the possibility that an attacker can access applications that were previously blocked by a proxy like mod_proxy.

Rationale

Allowing additional path-delimiters allows for an attacker to get to an application or area which was not previously visible.

Audit Procedure

Ensure the -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=false and -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=false parameters are added to the startup script which, by default, is located at $CATALINA_HOME/bin/catalina.sh.

Remediation

To start Tomcat with ALLOW_BACKSLASH and ALLOW_ENCODED_SLASH set to false, add -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=false and -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=false to your startup script in setenv.sh in CATALINA_BASE/bin.

Default Value

By default both parameters are set to false.

References

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

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	16.7 Use Standard Hardening Configuration Templates for Application InfrastructureUse standard, industry-recommended hardening configuration templates for application infrastructure components. This includes underlying servers, databases, and web servers, and applies to cloud containers, Platform as a Service (PaaS) components, and SaaS components. Do not allow in-house developed software to weaken configuration hardening.		●	●
v7	5.1 Establish Secure ConfigurationsMaintain documented, standard security configuration standards for all authorized operating systems and software.	●	●	●

Profile

Level 2