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The IIS 10.0 web server must not be both a website server and a proxy server.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-218794IIST-SV-000119SV-218794r960963_ruleCCI-000381medium
Description
A web server should be primarily a web server or a proxy server but not both, for the same reasons that other multi-use servers are not recommended. Scanning for web servers that also proxy requests into an otherwise protected network is a common attack, making the attack anonymous.
STIGDate
Microsoft IIS 10.0 Server Security Technical Implementation Guide2025-06-11

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CFG-01Configuration Management Program
1.00
CFG-03Least Functionality
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (36) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-11Device Lock
1.00
AC-17(1)Monitoring and Control
1.00
AC-17(10)Authenticate Remote Commands
1.00
AC-17(9)Disconnect or Disable Access
1.00
AC-18(1)Authentication and Encryption
1.00
AC-2(1)Automated System Account Management
1.00
AC-3Access Enforcement
1.00
AC-4Information Flow Enforcement
1.00
AU-12Audit Record Generation
1.00
AU-3Content of Audit Records
1.00

+26 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.4.6
1.00
CCI1 mapping
CCI-000381
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

PR.PS-01
1.00
PR.PS-05
1.00

Who does this work

5 NICE work roles and 5 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-218794r960963_chk)

Open the IIS 10.0 Manager. Under the "Connections" pane on the left side of the management console, select the IIS 10.0 web server. If, under the IIS installed features "Application Request Routing Cache" is not present, this is not a finding. If, under the IIS installed features "Application Request Routing Cache" is present, double-click the icon to open the feature. From the right "Actions" pane under "Proxy", select "Server Proxy Settings...". In the "Application Request Routing" settings window, verify whether "Enable proxy" is selected. If "Enable proxy" is selected under the "Application Request Routing" settings, this is a finding. If the server has been approved to be a Proxy server, this requirement is Not Applicable.

Fix Text (F-20264r928840_fix)

Open the IIS 10.0 Manager. Under the "Connections" pane on the left side of the management console, select the IIS 10.0 web server. Under the IIS installed features, if "Application Request Routing Cache" is present, double-click the icon to open the feature. From the right "Actions" pane, under "Proxy", select "Server Proxy Settings...". In the "Application Request Routing" settings window, remove the check from the "Enable proxy" check box. Click "Apply" in the "Actions" pane.