II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000478-GPOS-00223
Group -
NixOS must implement NIST FIPS-validated cryptography for the following: to provision digital signatures, to generate cryptographic hashes, and to protect unclassified information requiring confidentiality and cryptographic protection in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.
Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards...Rule High Severity -
SRG-OS-000480-GPOS-00225
Group -
NixOS must prevent the use of dictionary words for passwords.
If the operating system allows the user to select passwords based on dictionary words, then this increases the chances of password compromise by increasing the opportunity for successful guesses an...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
NixOS must enable the use of pwquality.
If the operating system allows the user to select passwords based on dictionary words, then this increases the chances of password compromise by increasing the opportunity for successful guesses an...Rule Medium Severity -
SRG-OS-000480-GPOS-00226
Group -
NixOS must enforce a delay of at least four seconds between login prompts following a failed login attempt.
Limiting the number of login attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account.Rule Medium Severity -
SRG-OS-000480-GPOS-00229
Group -
NixOS must not allow an unattended or automatic login to the system via the console.
Failure to restrict system access via the console to authenticated users negatively impacts operating system security.Rule High Severity -
SRG-OS-000480-GPOS-00230
Group -
NixOS must be configured to use AppArmor.
Users' home directories/folders may contain information of a sensitive nature. Nonprivileged users should coordinate any sharing of information with a system administrator (SA) through shared resou...Rule Medium Severity -
SRG-OS-000118-GPOS-00060
Group -
NixOS must disable account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity.
Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts...Rule Medium Severity -
SRG-OS-000120-GPOS-00061
Group -
NixOS must employ approved cryptographic hashing algorithms for all stored passwords.
Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DOD data may be ...Rule Medium Severity -
SRG-OS-000125-GPOS-00065
Group -
NixOS must employ strong authenticators in the establishment of nonlocal maintenance and diagnostic sessions.
If maintenance tools are used by unauthorized personnel, they may accidentally or intentionally damage or compromise the system. The act of managing systems and applications includes the ability to...Rule High Severity -
SRG-OS-000375-GPOS-00160
Group -
NixOS must implement multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access.
Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect cred...Rule Medium Severity
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