Title

The DNS server implementation must, for password-based authentication, store passwords using an approved salted key derivation function, preferably using a keyed hash. (Cat II impact)

Discussion

Password-based authentication applies to passwords regardless of whether they are used in single-factor or multifactor authentication. Long passwords or passphrases are preferable over shorter passwords. Enforced composition rules provide marginal security benefits while decreasing usability. However, organizations may choose to establish certain rules for password generation (e.g., minimum character length for long passwords) under certain circumstances and can enforce this requirement in IA-5(1)(h). Account recovery can occur, for example, in situations when a password is forgotten. Cryptographically protected passwords include salted one-way cryptographic hashes of passwords. The list of commonly used, compromised, or expected passwords includes passwords obtained from previous breach corpuses, dictionary words, and repetitive or sequential characters. The list includes context-specific words, such as the name of the service, username, and derivatives thereof.

Check Content

Verify the DNS server implementation is configured to store passwords using an approved salted key derivation function, preferably using a keyed hash. If the DNS server implementation is not configured to store passwords using an approved salted key derivation function, preferably using a keyed hash, this is a finding.

Fix Text

Configure the DNS server implementation to store passwords using an approved salted key derivation function, preferably using a keyed hash.

Additional Identifiers

Rule ID: SV-263636r982531_rule

Vulnerability ID: V-263636

Group Title: SRG-APP-000850

Expert Comments

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