Check: TCAT-AS-000920
Apache Tomcat Application Server 9 STIG:
TCAT-AS-000920
(in versions v2 r7 through v1 r1)
Title
ErrorReportValve showServerInfo must be set to false. (Cat II impact)
Discussion
The Error Report Valve is a simple error handler for HTTP status codes that will generate and return HTML error pages. It can also be configured to return pre-defined static HTML pages for specific status codes and/or exception types. Disabling showServerInfo will only return the HTTP status code and remove all CSS from the default non-error related HTTP responses.
Check Content
As an elevated user on the Tomcat server run the following command: sudo grep -i ErrorReportValve $CATALINA_BASE/conf/server.xml file. If the ErrorReportValve element is not defined and showServerInfo set to "false", this is a finding. EXAMPLE: <Host ...> ... <Valve className="org.apache.catalina.valves.ErrorReportValve" showServerInfo="false"/> ... </Host>
Fix Text
As a privileged user on the Tomcat server: Edit the $CATALINA_BASE/conf/server.xml file. Create or modify an ErrorReportValve <Valve> element nested beneath each <Host> element. EXAMPLE: <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="false"> ... <Valve className="org.apache.catalina.valves.ErrorReportValve" showServerInfo="false" /> ... </Host> Restart the Tomcat server: sudo systemctl restart tomcat sudo systemctl daemon-reload
Additional Identifiers
Rule ID: SV-222975r879655_rule
Vulnerability ID: V-222975
Group Title: SRG-APP-000266-AS-000169
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001312 |
The information system generates error messages that provide information necessary for corrective actions without revealing information that could be exploited by adversaries. |
Controls
Number | Title |
---|---|
SI-11 |
Error Handling |