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.

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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.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76737	IISW-SV-000140	SV-91433r2_rule		Medium

Description
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.

STIG	Date
IIS 8.5 Server Security Technical Implementation Guide	2019-10-01

Details

Check Text ( C-76393r2_chk )
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 (F-83433r2_fix)
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”.