The Security Token Service must be configured to show error pages with minimal information.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-239675	VCST-67-000024	SV-239675r816750_rule		Medium

Description
Web servers will often display error messages to client users, displaying 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. As such, the Security Token Service must be configured to not show server version information in error messages.

Description

Web servers will often display error messages to client users, displaying 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. As such, the Security Token Service must be configured to not show server version information in error messages.

STIG	Date
VMware vSphere 6.7 STS Tomcat Security Technical Implementation Guide	2022-01-03

Details

Check Text ( C-42908r816748_chk )
Connect to the PSC, whether external or embedded. At the command prompt, execute the following command: # xmllint --format /usr/lib/vmware-sso/vmware-sts/conf/server.xml \| sed '2 s/xmlns=".*"//g' \| xmllint --xpath '/Server/Service/Engine/Host/Valve[@className="org.apache.catalina.valves.ErrorReportValve"]' - Expected result: If the output does not match the expected result, this is a finding.

Fix Text (F-42867r816749_fix)
Connect to the PSC, whether external or embedded. Navigate to and open /usr/lib/vmware-sso/vmware-sts/conf/server.xml. Locate the following Host block: ... Inside this block, add the following on a new line: