Performance Charts must be configured to show error pages with minimal information.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-256634	SRG-APP-000266-WSR-000159	VCPF-70-000024	SV-256634r888393_rule	2023-02-21	1

Description
Web servers will often display error messages to client users, including enough information to aid in the debugging of the error. The information given back in error messages may display the web server type, version, patches installed, plug-ins and modules installed, type of code being used by the hosted application, and any backends being used for data storage. This information could be used by an attacker to blueprint what type of attacks might be successful. Therefore, Performance Charts must be configured with a catchall error handler that redirects to a standard "error.jsp".

Description

Web servers will often display error messages to client users, including enough information to aid in the debugging of the error. The information given back in error messages may display the web server type, version, patches installed, plug-ins and modules installed, type of code being used by the hosted application, and any backends being used for data storage. This information could be used by an attacker to blueprint what type of attacks might be successful. Therefore, Performance Charts must be configured with a catchall error handler that redirects to a standard "error.jsp".

ℹ️ Check
At the command prompt, run the following command: # xmllint --format /usr/lib/vmware-perfcharts/tc-instance/webapps/statsreport/WEB-INF/web.xml \| sed 's/xmlns=".*"//g' \| xmllint --xpath '/web-app/error-page/exception-type["text()=java.lang.Throwable"]/parent::error-page' - Expected result: <error-page> <exception-type>java.lang.Throwable</exception-type> <location>/http_error.jsp</location> </error-page> If the output 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/webapps/statsreport/WEB-INF/web.xml | sed 's/xmlns=".*"//g' | xmllint --xpath '/web-app/error-page/exception-type["text()=java.lang.Throwable"]/parent::error-page' - Expected result: <error-page> <exception-type>java.lang.Throwable</exception-type> <location>/http_error.jsp</location> </error-page> If the output does not match the expected result, this is a finding.

✔️ Fix
Navigate to and open: /usr/lib/vmware-perfcharts/tc-instance/webapps/statsreport/WEB-INF/web.xml Add the following section under the <web-apps> node: <error-page> <exception-type>java.lang.Throwable</exception-type> <location>/http_error.jsp</location> </error-page> Restart the service with the following command: # vmon-cli --restart perfcharts