The Windows 2012 DNS Server must protect the authenticity of zone transfers via transaction signing.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-58685	WDNS-SC-000019	SV-73115r1_rule		Medium

Description
Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. This applies to server-to-server (zone transfer) transactions and is provided by TSIG/SIG(0), which enforces mutual server authentication using a key that is unique to each server pair (TSIG) or using PKI-based authentication (SIG(0)), thus uniquely identifying the other server. TSIG and SIG(0) are not configurable in Windows 2012 DNS Server. To meet the requirement for authentication between Windows DNS servers, IPsec will be implemented between the Windows DNS servers which hosts any non-AD-integrated zones.

Description

Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. This applies to server-to-server (zone transfer) transactions and is provided by TSIG/SIG(0), which enforces mutual server authentication using a key that is unique to each server pair (TSIG) or using PKI-based authentication (SIG(0)), thus uniquely identifying the other server. TSIG and SIG(0) are not configurable in Windows 2012 DNS Server. To meet the requirement for authentication between Windows DNS servers, IPsec will be implemented between the Windows DNS servers which hosts any non-AD-integrated zones.

STIG	Date
Microsoft Windows 2012 Server Domain Name System Security Technical Implementation Guide	2015-03-30

Details

Check Text ( C-59557r2_chk )
NOTE: This requirement applies to any Windows 2012 DNS Servers which host non-AD-integrated zones (file based) even if the DNS servers host AD-integrated zones, too. If the Windows 2012 DNS Servers only host AD-integrated zones, this requirement is not applicable. To protect authenticity of zone transfers between Windows 2012 DNS Servers with file based zones, IPsec must be configured on each pair of name servers in a zone transfer transaction for those zones. Log on to the DNS server which hosts non-AD-integrated, file based zones, using the Administrator, Domain Admin or Enterprise Admin account. Press Windows Key + R, execute gpme.msc to open the Group Policy Management feature. In the Browse for Group Policy Object dialog box, double-click Domain Controllers.domain.com. Click Default Domain Controllers Policy and click OK. In the console tree, open Computer Configuration\Policies\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security - LDAP. Click Connection Security Rules. Consult with the SA to determine which Rules meet the intent of the server-to-server authentication. If Rules exist, double-click on each Rule to verify the following: For the "Authentication:" tab, click on the "Customize..." button. On the Authentication tab, verify "Authentication mode:" is set to "Request authentication for inbound and outbound connections". Confirm the "Signing Algorithm" is set to "RSA (default)". Under "Method", ensure the "Advanced:" radio button is selected. Click on the "Customize" button. For "First authentication methods:", double-click on the entry. Verify the "Select the credential to use for first authentication:" has "Computer certificate from this certification authority (CA):" radio button selected. Review the certificate specified and verify the certificate used was generated by the internally-managed server performing the Active Directory Certificate Services (AD CS) role. If rules do not exist for server-to-server authentication, this is a finding. If rules exist for this server to authenticate to other name servers hosting the same file based zones when transacting zone transfers, but the rules are not configured with the above settings, this is a finding.

Check Text ( C-59557r2_chk )

NOTE: This requirement applies to any Windows 2012 DNS Servers which host non-AD-integrated zones (file based) even if the DNS servers host AD-integrated zones, too.

If the Windows 2012 DNS Servers only host AD-integrated zones, this requirement is not applicable.

To protect authenticity of zone transfers between Windows 2012 DNS Servers with file based zones, IPsec must be configured on each pair of name servers in a zone transfer transaction for those zones.

Log on to the DNS server which hosts non-AD-integrated, file based zones, using the Administrator, Domain Admin or Enterprise Admin account.

Press Windows Key + R, execute gpme.msc to open the Group Policy Management feature.

In the Browse for Group Policy Object dialog box, double-click Domain Controllers.domain.com.

Click Default Domain Controllers Policy and click OK.

In the console tree, open Computer Configuration\Policies\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security - LDAP.

Click Connection Security Rules.

Consult with the SA to determine which Rules meet the intent of the server-to-server authentication.

If Rules exist, double-click on each Rule to verify the following:

For the "Authentication:" tab, click on the "Customize..." button.

On the Authentication tab, verify "Authentication mode:" is set to "Request authentication for inbound and outbound connections".

Confirm the "Signing Algorithm" is set to "RSA (default)".

Under "Method", ensure the "Advanced:" radio button is selected.

Click on the "Customize" button.

For "First authentication methods:", double-click on the entry.

Verify the "Select the credential to use for first authentication:" has "Computer certificate from this certification authority (CA):" radio button selected.

Review the certificate specified and verify the certificate used was generated by the internally-managed server performing the Active Directory Certificate Services (AD CS) role.

If rules do not exist for server-to-server authentication, this is a finding.

If rules exist for this server to authenticate to other name servers hosting the same file based zones when transacting zone transfers, but the rules are not configured with the above settings, this is a finding.

Fix Text (F-64069r1_fix)
Complete the following procedures twice for each pair of name servers. First create a rule for UDP connections, and then create a rule for TCP connections. Refer to the U_Windows_Domain_Name_Service_2012_Overview.pdf for Microsoft links for this procedure. Log on to the DNS server using the Domain Admin or Enterprise Admin account. Press Windows Key + R, execute gpme.msc to open the Group Policy Management feature. In the Browse for Group Policy Object dialog box, double-click Domain Controllers.domain.com. Click Default Domain Controllers Policy and click OK. In the console tree, open Computer Configuration\Policies\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security - LDAP. Right-Click Connection Security Rules and select New. For Rule Type, select the "Server-to-server" radio button, click Next. For Endpoint 1 and Endpoint 2, select "These IP addresses:" and add the IP addresses of all DNS servers, click Next. For Requirements, select "Request authentication for inbound and outbound connections", click Next. For Authentication Method, select Computer certificate and from the "Signing Algorithm:" drop-down, select "RSA (default)". From the "Certificate store type:" drop-down, select "Root CA (default). From the "CA name:", click Browse and select the certificate generated by the internally-managed server performing the Active Directory Certificate Services (AD CS) role, click Next. On Profile, accept default selections, click Next. On Name, enter a name applicable to the rule's function (i.e., DNSSEC UDP), click Finish.

Fix Text (F-64069r1_fix)

Complete the following procedures twice for each pair of name servers.

First create a rule for UDP connections, and then create a rule for TCP connections.

Refer to the U_Windows_Domain_Name_Service_2012_Overview.pdf for Microsoft links for this procedure.

Log on to the DNS server using the Domain Admin or Enterprise Admin account.

Press Windows Key + R, execute gpme.msc to open the Group Policy Management feature.

In the Browse for Group Policy Object dialog box, double-click Domain Controllers.domain.com.

Click Default Domain Controllers Policy and click OK.

In the console tree, open Computer Configuration\Policies\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security - LDAP.

Right-Click Connection Security Rules and select New.

For Rule Type, select the "Server-to-server" radio button, click Next.

For Endpoint 1 and Endpoint 2, select "These IP addresses:" and add the IP addresses of all DNS servers, click Next.

For Requirements, select "Request authentication for inbound and outbound connections", click Next.

For Authentication Method, select Computer certificate and from the "Signing Algorithm:" drop-down, select "RSA (default)".

From the "Certificate store type:" drop-down, select "Root CA (default).

From the "CA name:", click Browse and select the certificate generated by the internally-managed server performing the Active Directory Certificate Services (AD CS) role, click Next.

On Profile, accept default selections, click Next.

On Name, enter a name applicable to the rule's function (i.e., DNSSEC UDP), click Finish.