Double encoded URL requests must be prohibited by any IIS 10.0 website.
An XCCDF Rule
Description
<VulnDiscussion>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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-218757r961152_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
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.