The IIS 8.5 web server must produce log records containing sufficient information to establish the identity of any user/subject or process associated with an event.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76689	IISW-SV-000111	SV-91385r4_rule		Medium

Description
Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Determining user accounts, processes running on behalf of the user, and running process identifiers also enable a better understanding of the overall event. User tool identification is also helpful to determine if events are related to overall user access or specific client tools. Log record content that may be necessary to satisfy the requirement of this control includes: time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, file names involved, and access control or flow control rules invoked.

Description

Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Determining user accounts, processes running on behalf of the user, and running process identifiers also enable a better understanding of the overall event. User tool identification is also helpful to determine if events are related to overall user access or specific client tools. Log record content that may be necessary to satisfy the requirement of this control includes: time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, file names involved, and access control or flow control rules invoked.

STIG	Date
IIS 8.5 Server Security Technical Implementation Guide	2019-10-01

Details

Check Text ( C-76345r5_chk )
Note: If SSL is installed on load balancer through which traffic is routed to the IIS 8.5 server, and the IIS 8.5 server ONLY receives traffic from the load balancer, the SSL requirement must be met on the load balancer. Access the IIS 8.5 web server IIS Manager. Click the IIS 8.5 web server name. Under "IIS", double-click the "Logging" icon. Verify the "Format:" under "Log File" is configured to "W3C". Select the "Fields" button. Under "Standard Fields", verify "User Agent", "User Name" and "Referrer" are selected. Under "Custom Fields", verify the following field have been configured: Request Header >> Authorization Response Header >> Content-Type If any of the above fields are not selected, this is a finding.

Check Text ( C-76345r5_chk )

Note: If SSL is installed on load balancer through which traffic is routed to the IIS 8.5 server, and the IIS 8.5 server ONLY receives traffic from the load balancer, the SSL requirement must be met on the load balancer.
Access the IIS 8.5 web server IIS Manager.
Click the IIS 8.5 web server name.
Under "IIS", double-click the "Logging" icon.
Verify the "Format:" under "Log File" is configured to "W3C".
Select the "Fields" button.
Under "Standard Fields", verify "User Agent", "User Name" and "Referrer" are selected.
Under "Custom Fields", verify the following field have been configured:
Request Header >> Authorization
Response Header >> Content-Type
If any of the above fields are not selected, this is a finding.

Fix Text (F-83385r5_fix)
Access the IIS 8.5 web server IIS Manager. Click the IIS 8.5 web server name. Under "IIS", double-click the "Logging" icon. Verify the "Format:" under "Log File" is configured to "W3C". Select the "Fields" button. Under "Standard Fields", select "User Agent", "User Name" and "Referrer". Under "Custom Fields", select the following fields: Click on the "Source Type" drop-down list and select "Request Header". Click on the "Source" drop-down list and select "Authorization". Click “OK” to add. Click on the "Source Type" drop-down list and select "Response Header". Click on the "Source" drop-down list and select "Content-Type". Click “OK” to add. Click "OK". Click "Apply" under the "Actions" pane.

Fix Text (F-83385r5_fix)

Access the IIS 8.5 web server IIS Manager.
Click the IIS 8.5 web server name.
Under "IIS", double-click the "Logging" icon.
Verify the "Format:" under "Log File" is configured to "W3C".
Select the "Fields" button.
Under "Standard Fields", select "User Agent", "User Name" and "Referrer".
Under "Custom Fields", select the following fields:
Click on the "Source Type" drop-down list and select "Request Header".
Click on the "Source" drop-down list and select "Authorization".
Click “OK” to add.

Click on the "Source Type" drop-down list and select "Response Header".
Click on the "Source" drop-down list and select "Content-Type".
Click “OK” to add.
Click "OK".
Click "Apply" under the "Actions" pane.