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V-76817

The IIS 8.5 website must be configured to limit the maxURL.

Finding ID
IISW-SI-000225
Rule ID
SV-91513r1_rule
Severity
Cat II
CCE
(None)
Group Title
SRG-APP-000246-WSR-000149
CCI
CCI-001094
Target Key
(None)
Documentable
No
Discussion

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.

Fix Text

Follow the procedures below for each site hosted on the IIS 8.5 web server: Click the site name under review. Double-click the "Request Filtering" icon. Click “Edit Feature Settings” in the "Actions" pane. Set the "maxURL" value to "4096" or less.

Check Content

Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Click on the site name. Double-click the "Request Filtering" icon. Click “Edit Feature Settings” in the "Actions" pane. If the "maxUrl" value is not set to "4096" or less, this is a finding.