ACLs for system files and directories do not conform to minimum requirements.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-1130	2.006	SV-16968r1_rule		Medium

Description
Failure to properly configure file and directory permissions (ACLs) allows the possibility of unauthorized and anonymous modification to the operating system and installed applications.

STIG	Date
Windows Vista Security Technical Implementation Guide	2016-06-03

Details

Check Text ( C-39090r1_chk )
The default ACL settings are adequate when the Security Option “Network access: Let everyone permissions apply to anonymous users” is set to “Disabled” (V-3377) and Power User Group Membership is restricted. If the default ACLs are maintained, the referenced option is set to “Disabled” and Powers Users are restricted, this check should normally be marked not a finding. The Power Users group is included in later Windows versions for backward compatibility. If an ACL setting prevents a site’s applications from performing properly, the site can modify that specific setting. Settings should only be changed to the minimum necessary for the application to function. Each exception to the recommended settings should be documented and kept on file by the IAO.

Check Text ( C-39090r1_chk )

The default ACL settings are adequate when the Security Option “Network access: Let everyone permissions apply to anonymous users” is set to “Disabled” (V-3377) and Power User Group Membership is restricted. If the default ACLs are maintained, the referenced option is set to “Disabled” and Powers Users are restricted, this check should normally be marked not a finding.

The Power Users group is included in later Windows versions for backward compatibility.

If an ACL setting prevents a site’s applications from performing properly, the site can modify that specific setting. Settings should only be changed to the minimum necessary for the application to function. Each exception to the recommended settings should be documented and kept on file by the IAO.

Fix Text (F-29104r1_fix)
Maintain the default file ACLs, configure the Security Option: “Network access: Let everyone permissions apply to anonymous users” to “Disabled” (V-3377) and restrict the Power Users group to include no members.