Details

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.

Solution

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> ‘Network security- LAN Manager authentication level’ to at least ‘Send NTLMv2 response onlyrefuse LM’.

Supportive Information

The following resource is also helpful.

• http://iasecontent.disa.mil/stigs/zip/Oct2016/U_Windows_Vista_V6R41_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Windows.

References

• 800-53|CM-6b.
• CAT|I
• CCI|CCI-000366
• CSCv6|13
• Rule-ID|SV-29012r1_rule
• STIG-ID|3.031
• Vuln-ID|V-1153

Source

• Tenable.com/audits