Title

Non-system-created file shares on a system must limit access to groups that require it. (Cat II impact)

Discussion

Shares which provide network access, must not exist on a workstation except for system-created administrative shares, and could potentially expose sensitive information. If a share is necessary, share permissions, as well as NTFS permissions, must be reconfigured to give the minimum access to those accounts that require it.

Check Content

Non-system-created shares must not exist on workstations. If only system-created shares exist on the system, this is NA. Run "Computer Management". Navigate to System Tools >> Shared Folders >> Shares. If the only shares listed are "ADMIN$", "C$" and "IPC$", this is NA. (Selecting Properties for system-created shares will display a message that it has been shared for administrative purposes.) Right-click any non-system-created shares. Select "Properties". Select the "Share Permissions" tab. Verify the necessity of any shares found. If the file shares have not been reconfigured to restrict permissions to the specific groups or accounts that require access, this is a finding. Select the "Security" tab. If the NTFS permissions have not been reconfigured to restrict permissions to the specific groups or accounts that require access, this is a finding.

Fix Text

If a non-system-created share is required on a system, configure the share and NTFS permissions to limit access to the specific groups or accounts that require it. Remove any unnecessary non-system-created shares.

Additional Identifiers

Rule ID: SV-253267r958524_rule

Vulnerability ID: V-253267

Group Title: SRG-OS-000138-GPOS-00069

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.