Unauthorized shares can be accessed anonymously.

From Windows 2008 Domain Controller Security Technical Implementation Guide

Part of Anonymous Access to Network Shares

Associated with: CCI-001090

SV-29704r1_rule Unauthorized shares can be accessed anonymously.

Vulnerability 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 any entries, 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: (Blank)

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” to be defined but containing no entries (Blank).

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