Finding ID | Version | Rule ID | IA Controls | Severity |
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V-1153 | 3.031 | SV-25105r1_rule | IAIA-1 IAIA-2 | High |
Description |
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The Kerberos v5 authentication protocol is the default for authentication of users who are logging on to domain accounts. NTLM is retained in later Windows versions for compatibility with clients and servers that are running earlier versions of Windows. It is also used to authenticate logons to stand-alone computers that are running later versions. |
STIG | Date |
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Windows 7 Security Technical Implementation Guide | 2015-03-09 |
Check Text ( C-32723r1_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 “Network security: LAN Manager authentication level” is not set to “Send NTLMv2 response only\refuse LM & NTLM” (Level 5), then this is a finding. The policy referenced configures the following registry value: Registry Path: HKLM\System\CurrentControlSet\Control\Lsa\ Value Name: LmCompatibilityLevel Value Type: REG_DWORD Value: 5 Documentable Explanation: In a mixed Windows environment, if this setting needs to be loosened due to compatibility issues, then the reasons need to be documented with the IAO. |
Fix Text (F-28810r1_fix) |
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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network security: LAN Manager authentication level” to “Send NTLMv2 response only\refuse LM & NTLM”. |