WDNS-SC-000001 - The salt value for zones signed using NSEC3 RRs must be changed every time the zone is completely re-signed.

Information

NSEC records list the resource record types for the name, as well as the name of the next resource record. With this information it is revealed that the resource record type for the name queried, or the resource record name requested, does not exist. NSEC uses the actual resource record names, whereas NSEC3 uses a one-way hash of the name. In this way, walking zone data from one record to the next is prevented, at the expense of some CPU cycles both on the authoritative server as well as on the resolver. To prevent giving access to an entire zone file, NSEC3 should be configured, and, in order to use NSEC3, RSA/SHA-1 should be used as the algorithm, as some resolvers that understand RSA/SHA-1 might not understand NSEC3. Using RSA/SHA-256 is a safe alternative.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Sign, or re-sign, the hosted zone(s) on the DNS server being validated.

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

Press Windows Key + R, execute dnsmgmt.msc.

On the opened DNS Manager snap-in from the left pane, expand the server name for the DNS server, and then expand Forward Lookup Zones.

From the expanded list, right-click to select 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.

Re-validate the NSEC3PARAM Inception date and time against the DNSKEY date and time.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Windows_2012_Server_DNS_V2R7_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-13, CAT|II, CCI|CCI-002450, Rule-ID|SV-215609r961863_rule, STIG-ID|WDNS-SC-000001, STIG-Legacy|SV-73081, STIG-Legacy|V-58651, Vuln-ID|V-215609

Plugin: Windows

Control ID: d5abd11e965114ee458f3c4ab5b108287175a3ccdef7d86c86690cdee6b91b41