Warning and error messages displayed to clients must be modified to minimize the identity of the IIS 8.5 website, 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 website, patches, loaded modules, and directory paths.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76835	IISW-SI-000233	SV-91531r1_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 Site Security Technical Implementation Guide	2019-01-08

Details

Check Text ( C-76491r1_chk )
Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Click the site name under review. Double-click the "Error Pages" icon. Click each error message and click "Edit Feature" setting from the "Actions" pane. If any error message is not set to “Detailed errors for local requests and custom error pages for remote requests”, this is a finding.

Fix Text (F-83531r1_fix)
Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Click the site name under review. Double-click the "Error Pages" icon. Click each error message and click "Edit Feature" Setting from the "Actions" pane; set each error message to “Detailed errors for local requests and custom error pages for remote requests”.