cyberstrikeus Disable the Shutdown port (Not Scored)
Description
Tomcat listens on TCP port 8005 to accept shutdown requests. By connecting to this port and sending the SHUTDOWN command, all applications within Tomcat are halted. The shutdown port is not exposed to the network as it is bound to the loopback interface. If this functionality is not used, it is recommended that the shutdown port be disabled.
Rationale
Disabling the Shutdown port will eliminate the risk of malicious local entities using the shutdown command to disable the Tomcat server.
Audit Procedure
Perform the following to determine if the shutdown port has been disabled. Ensure the port attribute in $CATALINA_HOME/conf/server.xml is set to -1.
$ cd $CATALINA_HOME/conf/
$ grep '<Server[[:space:]]\+[^>]*port[[:space:]]*=[[:space:]]*"-1"' server.xml
Remediation
Set the port to -1 in the $CATALINA_HOME/conf/server.xml to disable the shutdown port.
<Server port="-1" shutdown="SHUTDOWN">
Default Value
The shutdown port is enabled on TCP port 8005, bound to the loopback address.
References
CIS Controls
v7:
- 9.2 Ensure Only Approved Ports, Protocols and Services Are Running
- Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.
Profile Applicability
- Level 2