Finding ID | Version | Rule ID | IA Controls | Severity |
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V-21950 | 3.150 | SV-25273r1_rule | ECSC-1 | Medium |
Description |
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This setting helps prevent spoofing; ensuring that if a service principle name (SPN) is provided by the client, it is validated against the server’s list of SPNs. |
STIG | Date |
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Windows 7 Security Technical Implementation Guide | 2012-07-02 |
Check Text ( C-26832r1_chk ) |
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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 “Microsoft network server: Server SPN target name validation level” is not set to “Accept if provided by client”, then 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-22939r1_fix) |
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Configure the policy value for “Microsoft network server: Server SPN target name validation level” to “Accept if provided by client”. |