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V-218754

CAT II (Medium)

The IIS 10.0 website must be configured to limit the size of web requests.

Rule ID

SV-218754r1156525_rule

STIG

Microsoft IIS 10.0 Site Security Technical Implementation Guide

Version

V2R15

CCIs

CCI-001094

Discussion

By setting limits on web requests, it ensures availability of web services and mitigates the risk of buffer overflow type attacks. The maxAllowedContentLength Request Filter limits the number of bytes the server will accept in a request.

Check Content

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

Open the IIS 10.0 Manager.

Click on the site name.

Double-click the "Request Filtering" icon.

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

If the "maxAllowedContentLength" value is not explicitly set to "2147483647" or less or a length documented and approved by the ISSO, 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.

Set the "maxAllowedContentLength" value to "2147483647" or less.