II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000363-GPOS-00150
Group -
NixOS must notify designated personnel if baseline configurations are changed in an unauthorized manner.
Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configuratio...Rule Medium Severity -
SRG-OS-000366-GPOS-00153
Group -
NixOS must prevent the installation of patches, service packs, device drivers, or operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization.
Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has bee...Rule High Severity -
SRG-OS-000480-GPOS-00227
Group -
NixOS must require users to reauthenticate for privilege escalation.
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, i...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
NixOS must require users to reauthenticate when changing roles.
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to change security roles, it is critic...Rule Medium Severity -
SRG-OS-000393-GPOS-00173
Group -
NixOS must implement cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.
Privileged access contains control and configuration information and is particularly sensitive, so additional protections are necessary. This is maintained by using cryptographic mechanisms, such a...Rule High Severity -
SRG-OS-000420-GPOS-00186
Group -
NixOS must protect against or limit the effects of denial-of-service (DoS) attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces.
Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requireme...Rule Medium Severity -
SRG-OS-000423-GPOS-00187
Group -
NixOS must protect the confidentiality and integrity of transmitted information.
Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requireme...Rule High Severity -
SRG-OS-000433-GPOS-00192
Group -
NixOS must implement nonexecutable data to protect its memory from unauthorized code execution.
Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory inclu...Rule Medium Severity -
SRG-OS-000433-GPOS-00193
Group -
NixOS must implement address space layout randomization to protect its memory from unauthorized code execution.
Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory inclu...Rule Medium Severity -
SRG-OS-000437-GPOS-00194
Group -
NixOS must remove all software components after updated versions have been installed.
Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may...Rule Medium Severity -
SRG-OS-000463-GPOS-00207
Group -
NixOS must generate audit records when successful/unsuccessful attempts to modify security objects occur.
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an in...Rule Medium Severity -
SRG-OS-000466-GPOS-00210
Group -
NixOS must generate audit records when successful/unsuccessful attempts to delete privileges occur.
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an in...Rule Medium Severity -
SRG-OS-000468-GPOS-00212
Group -
NixOS must generate audit records when successful/unsuccessful attempts to delete security objects occur.
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an in...Rule Medium Severity -
SRG-OS-000473-GPOS-00218
Group -
NixOS must generate audit records when concurrent logins to the same account occur from different sources.
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an in...Rule Medium Severity -
SRG-OS-000476-GPOS-00221
Group -
NixOS must generate audit records for all account creations, modifications, disabling, and termination events.
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an in...Rule Medium Severity -
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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