Title

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). (Cat II impact)

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 which 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.

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 Protected Distribution System (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 Protected Distribution Systems (PDS).

Additional Identifiers

Rule ID: SV-205217r961635_rule

Vulnerability ID: V-205217

Group Title: SRG-APP-000440

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.