The production web-site must limit the MaxURL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26042	WA000-WI6220	SV-32693r3_rule		Medium

Description
Request filtering replaces URLScan in IIS, enabling administrators to create a more granular rule set with which to allow or reject inbound web content. By setting limits on web requests, it helps to ensure availability of web services and may also help mitigate the risk of buffer overflow type attacks. The MaxURL Request Filter limits the number of bytes the server will accept in a URL.

STIG	Date
IIS 7.0 WEB SITE STIG	2017-12-21

Details

Check Text ( C-32890r2_chk )
For each site reviewed: 1. Open the IIS Manager. 2. Click on the site name. 3. Double-click the Request Filtering icon. 4. Click Edit Feature Settings in the Actions Pane. If the maxURL value is not set to 4096, this is a finding. NOTE: If the site has operational reasons to set maxURL to an alternate value, and has supporting documentation signed by the ISSO, this is not a finding.

Fix Text (F-29036r1_fix)
1. Open the IIS Manager. 2. Click the site name under review. 3. Double-click the Request Filtering icon. 4. Click Edit Feature Settings in the Actions Pane. 5. Set the maxURL value to 4096.