Title

Unauthorized shares can be accessed anonymously. (Cat I impact)

Discussion

This is a Category 1 finding because the potential for gaining unauthorized system access. Any shares listed can be accessed by any network user. This could lead to the exposure or corruption of sensitive data. Enabling this setting is very dangerous.

Check Content

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “Network access: Shares that can be accessed anonymously” includes entries except “DFS$ and COMCFG”, then this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\ Value Name: NullSessionShares Value Type: REG_MULTI_SZ Value: as defined in policy above

Fix Text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network access: Shares that can be accessed anonymously” as defined in the Check section.

Additional Identifiers

Rule ID: SV-6276r1_rule

Vulnerability ID: V-3340

Group Title: Anonymous Access to Network Shares

Expert Comments

CCIs tied to check.

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