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V-218757

CAT II (Medium)

Double encoded URL requests must be prohibited by any IIS 10.0 website.

Rule ID

SV-218757r961152_rule

STIG

Microsoft IIS 10.0 Site Security Technical Implementation Guide

Version

V2R15

CCIs

CCI-001094

Discussion

Request filtering enables administrators to create a more granular rule set with which to allow or reject inbound web content. Setting limits on web requests ensures availability of web services and mitigates the risk of buffer overflow type attacks. When the "Allow double escaping" option is disabled, it prevents attacks that rely on double-encoded requests.

Check Content

Note: If the server being reviewed is hosting SharePoint, this is Not Applicable.

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click the site name.

Double-click the "Request Filtering" icon.

Click "Edit Feature Settings" in the "Actions" pane.

If the "Allow double escaping" check box is checked, this is a finding.

Fix Text

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click the site name under review.

Double-click the "Request Filtering" icon.

Click "Edit Feature Settings" in the "Actions" pane.

Uncheck the "Allow double escaping" check box.