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

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

DISA Rule

SV-218740r558649_rule

Vulnerability Number

V-218740

Group Title

SRG-APP-000098-WSR-000060

Rule Version

IIST-SI-000208

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

Open the IIS 10.0 Manager.

Click the site name.

Click the "Logging" icon.

Click "View log file".

When log file is displayed, review source IP information in log entries and verify 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-218740

Documentable

False

Rule Version

IIST-SI-000208

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

Open the IIS 10.0 Manager.

Click the site name.

Click the "Logging" icon.

Click "View log file".

When log file is displayed, review source IP information in log entries and verify 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

4051

Comments