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V-205217

CAT II (Medium)

The DNS server implementation must implement cryptographic mechanisms to detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a Protected Distribution System (PDS).

Rule ID

SV-205217r1137675_rule

STIG

Domain Name System (DNS) Security Requirements Guide

Version

V4R2

CCIs

CCI-002421

Discussion

Encrypting information for transmission protects information from unauthorized disclosure and modification. Cryptographic mechanisms implemented to protect information integrity include, for example, cryptographic hash functions that have common application in digital signatures, checksums, and message authentication codes. Confidentiality is not an objective of DNS, but integrity is. DNSSEC and TSIG/SIG(0) both digitally sign DNS information to authenticate its source and ensure its integrity. This requirement also applies to Zero Trust initiatives.

Check Content

Review the DNS server implementation configuration to determine if the DNS server implements cryptographic mechanisms to detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a PDS. 

If the DNS server does not implement such cryptographic mechanisms, this is a finding.

Fix Text

Configure the DNS server to detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a  PDS.