Performance Charts default servlet must be set to "readonly".

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-256644	SRG-APP-000516-WSR-000174	VCPF-70-000034	SV-256644r888423_rule	2023-02-21	1

Description
The default servlet (or DefaultServlet) is a special servlet provided with Tomcat that is called when no other suitable page is found in a particular folder. The DefaultServlet serves static resources as well as directory listings. The DefaultServlet is configured by default with the "readonly" parameter set to "true" where HTTP commands such as PUT and DELETE are rejected. Changing this to "false" allows clients to delete or modify static resources on the server and to upload new resources. DefaultServlet "readonly" must be set to "true", either literally or by absence (default).

Description

The default servlet (or DefaultServlet) is a special servlet provided with Tomcat that is called when no other suitable page is found in a particular folder. The DefaultServlet serves static resources as well as directory listings. The DefaultServlet is configured by default with the "readonly" parameter set to "true" where HTTP commands such as PUT and DELETE are rejected. Changing this to "false" allows clients to delete or modify static resources on the server and to upload new resources. DefaultServlet "readonly" must be set to "true", either literally or by absence (default).

ℹ️ Check
At the command prompt, run the following command: # xmllint --format /usr/lib/vmware-perfcharts/tc-instance/conf/web.xml \| sed 's/xmlns=".*"//g' \| xmllint --xpath '/web-app/servlet/servlet-name[text()="default"]/../init-param/param-name[text()="readonly"]/../param-value[text()="false"]' - Expected result: XPath set is empty If the output of the command does not match the expected result, this is a finding.

ℹ️ Check

At the command prompt, run the following command: # xmllint --format /usr/lib/vmware-perfcharts/tc-instance/conf/web.xml | sed 's/xmlns=".*"//g' | xmllint --xpath '/web-app/servlet/servlet-name[text()="default"]/../init-param/param-name[text()="readonly"]/../param-value[text()="false"]' - Expected result: XPath set is empty If the output of the command does not match the expected result, this is a finding.

✔️ Fix
Navigate to and open: /usr/lib/vmware-perfcharts/tc-instance/conf/web.xml Navigate to the /<web-apps>/<servlet>/<servlet-name>default</servlet-name>/ node and remove the following node: <init-param> <param-name>readonly</param-name> <param-value>false</param-value> </init-param> Restart the service with the following command: # vmon-cli --restart perfcharts