Vulnerability Discussion

Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined.

Ascertaining the success or failure of an event is important during forensic analysis. Correctly determining the outcome will add information to the overall reconstruction of the loggable event. By determining the success or failure of the event correctly, analysis of the enterprise can be undertaken to determine if events tied to the event occurred in other areas within the enterprise.

Without sufficient information establishing the success or failure of the logged event, investigation into the cause of event is severely hindered. The success or failure also provides a means to measure the impact of an event and help authorized personnel determine the appropriate response. Log record content that may be necessary to satisfy the requirement of this control includes, but is not limited to, time stamps, source and destination IP addresses, user/process identifiers, event descriptions, application-specific events, success/fail indications, file names involved, access control, or flow control rules invoked.

Check

Access the IIS 10.0 web server IIS Manager.
Click the IIS 10.0 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 "Custom Fields", verify the following fields have been configured:
Request Header >> Connection
Request Header >> Warning
If any of the above fields are not selected, this is a finding.

Fix

Access the IIS 10.0 web server IIS Manager.
Click the IIS 10.0 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 "Custom Fields", click the "Add Field..." button.
For each field being added, give a name unique to what the field is capturing.
Click on the "Source Type" drop-down list and select "Request Header".
Click on the "Source" drop-down list and select "Connection".
Click "OK" to add.

Click on the "Source Type" drop-down list and select "Request Header".
Click on the "Source" drop-down list and select "Warning".
Click "OK" to add.
Click "Apply" under the "Actions" pane.