The Deny access to this computer from the network user right on member servers must be configured to prevent access from highly privileged domain accounts and local accounts on domain systems and unauthenticated access on all systems.

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of Deny Access from the Network

Associated with: CCI-000213

SV-32302r7_rule The Deny access to this computer from the network user right on member servers must be configured to prevent access from highly privileged domain accounts and local accounts on domain systems and unauthenticated access on all systems.

Vulnerability discussion

Inappropriate granting of user rights can provide system, administrative, and other high level capabilities.The "Deny access to this computer from the network" right defines the accounts that are prevented from logging on from the network.In an Active Directory Domain, denying logons to the Enterprise Admins and Domain Admins groups on lower trust systems helps mitigate the risk of privilege escalation from credential theft attacks which could lead to the compromise of an entire domain.Local accounts on domain-joined systems must also be assigned this right to decrease the risk of lateral movement resulting from credential theft attacks.The Guests group must be assigned this right to prevent unauthenticated access.

Check content

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies >> User Rights Assignment. If the following accounts or groups are not defined for the "Deny access to this computer from the network" right, this is a finding. Domain Systems Only: Enterprise Admins group Domain Admins group "Local account and member of Administrators group" or "Local account" (see Note below) All Systems: Guests group Note: Microsoft Security Advisory Patch 2871997 adds new built-in security groups, "Local account" and "Local account and member of Administrators group", to Windows Server 2008 R2. "Local account" is more restrictive but may cause issues on servers such as systems that provide Failover Clustering.

Fix text

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny access to this computer from the network" to include the following. Domain Systems Only: Enterprise Admins group Domain Admins group "Local account and member of Administrators group" or "Local account" (see Note below) All Systems: Guests group Note: Microsoft Security Advisory Patch 2871997 adds new built-in security groups, "Local account" and "Local account and member of Administrators group", to Windows Server 2008 R2. "Local account" is more restrictive but may cause issues on servers such as systems that provide Failover Clustering.

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