Finding ID | Version | Rule ID | IA Controls | Severity |
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V-21950 | WN08-SO-000035 | SV-48416r1_rule | ECSC-1 | Medium |
Description |
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If a service principle name (SPN) is provided by the client, it is validated against the server's list of SPNs, aiding in the prevention of spoofing. |
STIG | Date |
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Windows 8 Security Technical Implementation Guide | 2014-01-07 |
Check Text ( C-45085r2_chk ) |
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Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Microsoft network server: Server SPN target name validation level" is not set to "Accept if provided by client", this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Subkey: \System\CurrentControlSet\Services\LanmanServer\Parameters\ Value Name: SmbServerNameHardeningLevel Type: REG_DWORD Value: 1 |
Fix Text (F-41547r1_fix) |
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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Microsoft network server: Server SPN target name validation level" to "Accept if provided by client". |