The Send download LanMan compatible password option is not set to Send NTLMv2 response only\refuse LM.

From Windows 2008 Member Server Security Technical Implementation Guide

Associated with IA controls: IAIA-2, IAIA-1

SV-29013r1_rule The Send download LanMan compatible password option is not set to Send NTLMv2 response only\refuse LM.

Vulnerability discussion

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.

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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 at least “Send NTLMv2 response only\refuse LM”.

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