Check: WN12-SO-000028
Microsoft Windows Server 2012/2012 R2 Domain Controller STIG:
WN12-SO-000028
(in versions v3 r7 through v2 r7)
Title
The Windows SMB client must be configured to always perform SMB packet signing. (Cat II impact)
Discussion
The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB client will only communicate with an SMB server that performs SMB packet signing.
Check Content
If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\LanmanWorkstation\Parameters\ Value Name: RequireSecuritySignature Value Type: REG_DWORD Value: 1
Fix Text
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Microsoft network client: Digitally sign communications (always)" to "Enabled".
Additional Identifiers
Rule ID: SV-226293r916422_rule
Vulnerability ID: V-226293
Group Title: SRG-OS-000423-GPOS-00187
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-002418 |
The information system protects the confidentiality and/or integrity of transmitted information. |
| CCI-002421 |
The information system implements cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission unless otherwise protected by organization-defined alternative physical safeguards. |