Title

The LanMan authentication level will be set to Send NTLMv2 response only\refuse LM & NTLM. (Cat I impact)

Discussion

The Kerberos v5 authentication protocol is the default for authentication of users who are logging on to domain accounts. The Windows NTLM protocol is retained in later Windows versions for compatibility with clients and servers that are running earlier versions. It is also used to authenticate logons to stand-alone computers that are running later versions.

Check Content

Fix Text

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”.

Additional Identifiers

Rule ID: SV-32300r1_rule

Vulnerability ID: V-1153

Group Title: LanMan Authentication Level

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.