Information disclosure from host response

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Ultimo aggiornamento il 18 gen 2022

Issue

ColdFusion users have reported that under certain circumstances, the Tomcat server responds to requests with a verbose error report, which exposes limited technical information about the environment.

This issue can be resolved with the following workaround.

Workaround

Stop ColdFusion server.
Navigate to [Instance Home]\runtime\conf\server.xml.

It is a good practice to back up server.xml before making changes.
In the Host node, add the following
```
<Valve  
               className="org.apache.catalina.valves.ErrorReportValve" 
               showReport="false" 
               showServerInfo="false"  
/>
```
You can also refer to the following Tomcat documentation:
- Tomcat docs for configuring Valve - ColdFusion (2018 release)
- Tomcat docs for configuring Valve - ColdFusion (2016 release)

The updated server.xml file is shown below:

<Host autoDeploy="false" appBase="webapps" name="localhost" unpackWARs="false"> 
    <Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false"/> 
. 
. 
. 
</Host>

Restart ColdFusion.

Custom error page

You can add a custom error page in ColdFusion (2018 release).

To customize the message, add the following:

errorCode.<Status Code>="Path to error page relative to the runtime folder"

For example, to customize a page for Error 500, add the following in <Valve/> in server.xml.

<Valve  
                className="org.apache.catalina.valves.ErrorReportValve"  
                showReport="false"  
                showServerInfo="false" 
                errorCode.500="../wwwroot/WEB-INF/exception/Error.html" 
/>

You must create the custom error page and place in the specified folder.