The production web-site must configure the Maximum Query String limit.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26043	WA000-WI6230	SV-32694r3_rule	ECSC-1	Medium

Description
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 Maximum Query String Request Filter describes the upper limit on allowable query string lengths. Upon exceeding the configured value, IIS will generate a Status Code 404.15.

STIG	Date
IIS 7.0 WEB SITE STIG	2015-06-01

Details

Check Text ( C-32891r2_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 Maximum Query String value is not set to 2048, this is a finding. NOTE: If the site has operational reasons to set Maximum Query String to an alternate value, and has supporting documentation signed by the ISSO, this is not a finding.

Check Text ( C-32891r2_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 Maximum Query String value is not set to 2048, this is a finding.

NOTE: If the site has operational reasons to set Maximum Query String to an alternate value, and has supporting documentation signed by the ISSO, this is not a finding.

Fix Text (F-29037r1_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 Maximum Query String value to 2048.