Allow NTLM to fall back to NULL session when used with LocalSystem. The default is TRUE up to Windows Vista and FALSE in Windows 7. Countermeasure: Configure Network security: Allow LocalSystem NULL session fallback to Disabled. Potential Impact: Any applications that require NULL sessions for LocalSystem will not work as designed. [enabled/disabled] (1) GPO: Computer Configuration\\Windows Settings\\Security Settings\\Local Policies\\Security Options\\Network security: Allow LocalSystem NULL session fallback (2) REG: HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Control\\Lsa\\MSV1_0!allownullsessionfallback oval:gov.nist.usgcb.windowsseven:def:20016 BITS Shared Assessments SIG v6.0 Jericho Forum HIPAA/HITECH Act FedRAMP Security Controls(Final Release Jan 2012)--LOW IMPACT LEVEL-- ISO/IEC 27001-2005 COBIT 4.1 GAPP (Aug 2009) NERC CIP NIST SP800-53 R3 CM-7 NIST SP800-53 R3 IA-2 PCIDSS v2.0 FedRAMP Security Controls(Final Release Jan 2012)--MODERATE IMPACT LEVEL-- BITS Shared Assessments AUP v5.0 SCAP Repo OVAL Definition 2012-04-13 BITS Shared Assessments SIG v6.0 2012-10-12 Jericho Forum 2012-10-12 HIPAA/HITECH Act 2012-10-12 ISO/IEC 27001-2005 2012-10-12 COBIT 4.1 2012-10-12 GAPP (Aug 2009) 2012-10-12 NERC CIP 2012-10-12 NIST SP800-53 R3 2012-10-12 PCIDSS v2.0 2012-10-12 BITS Shared Assessments AUP v5.0 2012-10-12