STIGQter: STIG Summary: Microsoft IIS 10.0 Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

An IIS 10.0 web server behind a load balancer or proxy server must produce log records containing the source client IP and destination information.

DISA Rule

SV-218787r561041_rule

Vulnerability Number

V-218787

Group Title

SRG-APP-000098-WSR-000060

Rule Version

IIST-SV-000109

Severity

CAT II

CCI(s)

• CCI-000133 - The information system generates audit records containing information that establishes the source of the event.

Weight

10

Fix Recommendation

Access the proxy server through which inbound web traffic is passed and configure settings to pass web traffic to the IIS 10.0 web server transparently.

Check Contents

Interview the System Administrator to review the configuration of the IIS 10.0 architecture and determine if inbound web traffic is passed through a proxy.

If the IIS 10.0 web server is receiving inbound web traffic through a proxy, the audit logs must be reviewed to determine if correct source information is being passed through by the proxy server.

Follow this procedure for web server and each website:

Open the IIS 10.0 Manager.

Click the IIS 10.0 web server name.

Click the "Logging" icon.

Click on "View log files" under the "Actions" pane.

When the log file is displayed, review source IP information in log entries and verify the entries do not reflect the IP address of the proxy server.

If the website is not behind a load balancer or proxy server, this is Not Applicable.

If the log entries in the log file(s) reflect the IP address of the proxy server as the source, this is a finding.

If provisions have been made to log the client IP via another field (i.e., utilizing X-Forwarded-For), this is not a finding.

Vulnerability Number

V-218787

Documentable

False

Rule Version

IIST-SV-000109

Severity Override Guidance

Interview the System Administrator to review the configuration of the IIS 10.0 architecture and determine if inbound web traffic is passed through a proxy.

If the IIS 10.0 web server is receiving inbound web traffic through a proxy, the audit logs must be reviewed to determine if correct source information is being passed through by the proxy server.

Follow this procedure for web server and each website:

Open the IIS 10.0 Manager.

Click the IIS 10.0 web server name.

Click the "Logging" icon.

Click on "View log files" under the "Actions" pane.

When the log file is displayed, review source IP information in log entries and verify the entries do not reflect the IP address of the proxy server.

If the website is not behind a load balancer or proxy server, this is Not Applicable.

If the log entries in the log file(s) reflect the IP address of the proxy server as the source, this is a finding.

If provisions have been made to log the client IP via another field (i.e., utilizing X-Forwarded-For), this is not a finding.

Check Content Reference

M

Target Key

4052

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