Check: WDNS-IA-000003
Microsoft Windows 2012 Server Domain Name System STIG:
WDNS-IA-000003
(in versions v2 r6 through v1 r5)
Title
The secondary Windows DNS name servers must cryptographically authenticate zone transfers from primary name servers. (Cat II impact)
Discussion
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Device authentication is a solution enabling an organization to manage devices. It is an additional layer of authentication ensuring only specific pre-authorized devices can access the system. This requirement applies to server-to-server (zone transfer) transactions only 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)).
Check Content
Authenticity of zone transfers within Windows AD integrated zones is accomplished by AD replication. For zones which are completely AD-integrated, this check is not a finding. For authenticity of zone transfers between non-AD-integrated zones, DNSSEC must be implemented. Validate this check from the Windows 2012 DNS server being configured/reviewed. Log on to the Windows 2012 DNS server using the account designated as Administrator or DNS Administrator. Determine a valid host in the zone. Open the Windows PowerShell prompt on the Windows 2012 DNS server being configured/reviewed. Issue the following command: (Replace www.zonename.mil with a FQDN of a valid host in the zone being validated. Replace ###.###.###.### with the FQDN or IP address of the Windows 2012 DNS Server hosting the signed zone.) resolve-dnsname www.zonename.mil -server ###.###.###.### -dnssecok <enter> NOTE: It is important to use the -server switch followed by the DNS Server name/IP address. The result should show the "A" record results. In addition, the results should show QueryType: RRSIG with an expiration, date signed, signer and signature, similar to the following: Name: www.zonename.mil QueryType: RRSIG TTL: 189 Section: Answer TypeCovered: CNAME Algorithm: 8 LabelCount: 3 OriginalTtl: 300 Expiration: 11/21/2014 10:22:28 PM Signed: 10/22/2014 10:22:28 PM Signer: zonename.mil Signature: {87, 232, 34, 134...} Name: origin-www.zonename.mil QueryType: A TTL: 201 Section: Answer IP4Address: ###.###.###.### If the results do not show the RRSIG and signature information, indicating the zone has been signed with DNSSEC, this is a finding.
Fix Text
Sign, or re-sign, the hosted zone(s) on the DNS server being validated. Log on to the DNS server using the account designated as Administrator or DNS Administrator. If not automatically started, initialize the Server Manager window by clicking its icon from the bottom left corner of the screen. Once the Server Manager window is initialized, from the left pane, click to select the DNS category. From the right pane, under the SERVERS section, right-click the DNS server. From the context menu that appears, click DNS Manager. In the DNS Manager console tree on the DNS server being validated, navigate to Forward Lookup Zones. Right-click the zone (repeat for each hosted zone), point to DNSSEC, and then click Sign the Zone, either using approved saved parameters or approved custom parameters.
Additional Identifiers
Rule ID: SV-215601r879767_rule
Vulnerability ID: V-215601
Group Title: SRG-APP-000394-DNS-000049
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001958 |
The information system authenticates an organization-defined list of specific and/or types of devices before establishing a local, remote, or network connection. |
Controls
Number | Title |
---|---|
IA-3 |
Device Identification And Authentication |