10.8 Do not allow additional path delimiters - ALLOW_BACKSLASH

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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.


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


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.

See Also