The log information from the IIS 8.5 web server must be protected from unauthorized modification.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76693	IISW-SV-000114	SV-91389r1_rule		Medium

Description
A major tool in exploring the website use, attempted use, unusual conditions, and problems are the access and error logs. In the event of a security incident, these logs can provide the SA and the web manager with valuable information. Failure to protect log files could enable an attacker to modify the log file data or falsify events to mask an attacker's activity.

STIG	Date
IIS 8.5 Server Security Technical Implementation Guide	2018-01-03

Details

Check Text ( C-76349r1_chk )

Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Click the "Logging" icon. Click the "Browse" button and navigate to the directory where the log files are stored. Right-click the log file name to review and click “Properties”. Click the "Security" tab. Verify only authorized groups are listed, if others are listed, this is a finding. If any auditors, SA or web administrators have greater than read authority to log files, this is a finding. This check does not apply to service IDs utilized by automated services necessary to process, manage, and store log files.

Fix Text (F-83389r1_fix)
Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Click the "Logging" icon. Click the "Browse" button and navigate to the directory where the log files are stored. Right-click the log file name to review and click “Properties”. Click the "Security" tab. Set the log file permissions for the appropriate group(s). Click "OK". Select "Apply" in the "Actions" pane.