Title

Warning and error messages displayed to clients must be modified to minimize the identity of the IIS 8.5 web server, patches, loaded modules, and directory paths. (Cat II impact)

Discussion

HTTP error pages contain information that could enable an attacker to gain access to an information system. Failure to prevent the sending of HTTP error pages with full information to remote requesters exposes internal configuration information to potential attackers.

Check Content

Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Double-click the "Error Pages" icon. Click on any error message and click "Edit Feature Setting" from the "Actions" Pane. This will apply to all error messages. If the feature setting is not set to “Detailed errors for local requests and custom error pages for remote requests”, this is a finding.

Fix Text

Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Double-click the "Error Pages" icon. Click on any error message and click "Edit Feature Setting" from the "Actions" Pane. This will apply to all error messages. Set Feature Setting to “Detailed errors for local requests and custom error pages for remote requests”.

Additional Identifiers

Rule ID: SV-214425r879655_rule

Vulnerability ID: V-214425

Group Title: SRG-APP-000266-WSR-000159

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.