I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000324
Group -
The operating system must prevent nonprivileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileg...Rule High Severity -
SRG-OS-000326
Group -
The operating system must prevent all software from executing at higher privilege levels than users executing the software.
In certain situations, software applications/programs need to execute with elevated privileges to perform required functions. However, if the privileges required for execution are at a higher level...Rule Medium Severity -
SRG-OS-000327
Group -
The operating system must audit the execution of privileged functions.
Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and...Rule Medium Severity -
SRG-OS-000329
Group -
The operating system must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts in 15 minutes occur.
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the a...Rule Medium Severity -
SRG-OS-000337
Group -
The operating system must provide the capability for assigned IMOs/ISSOs or designated SAs to change the auditing to be performed on all operating system components, based on all selectable event criteria in near real time.
If authorized individuals do not have the ability to modify auditing parameters in response to a changing threat environment, the organization may not be able to effectively respond, and important ...Rule Medium Severity -
SRG-OS-000341
Group -
The operating system must allocate audit record storage capacity to store at least one week's worth of audit records, when audit records are not immediately sent to a central audit record storage facility.
In order to ensure operating systems have a sufficient storage capacity in which to write the audit logs, operating systems need to be able to allocate audit record storage capacity. The task of a...Rule Low Severity -
SRG-OS-000342
Group -
The operating system must offload audit records onto a different system or media from the system being audited.
Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.Rule Low Severity -
SRG-OS-000343
Group -
The operating system must immediately notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity.
If security personnel are not notified immediately when storage volume reaches 75% utilization, they are unable to plan for audit record storage capacity expansion.Rule Low Severity -
SRG-OS-000344
Group -
The operating system must provide an immediate real-time alert to the SA and ISSO, at a minimum, of all audit failure events requiring real-time alerts.
It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without a real-time alert, security personnel may be unaware of an impe...Rule Medium Severity -
SRG-OS-000348
Group -
The operating system must provide an audit reduction capability that supports on-demand audit review and analysis.
The ability to perform on-demand audit review and analysis, including after the audit data has been subjected to audit reduction, greatly facilitates the organization's ability to generate incident...Rule Low Severity -
SRG-OS-000349
Group -
The operating system must provide an audit reduction capability that supports after-the-fact investigations of security incidents.
If the audit reduction capability does not support after-the-fact investigations, it is difficult to establish, correlate, and investigate the events leading up to an outage or attack or identify t...Rule Low Severity -
SRG-OS-000350
Group -
The operating system must provide a report generation capability that supports on-demand audit review and analysis.
The report generation capability must support on-demand review and analysis in order to facilitate the organization's ability to generate incident reports, as needed, to better handle larger-scale ...Rule Low Severity -
SRG-OS-000351
Group -
The operating system must provide a report generation capability that supports on-demand reporting requirements.
The report generation capability must support on-demand reporting in order to facilitate the organization's ability to generate incident reports, as needed, to better handle larger-scale or more co...Rule Low Severity -
SRG-OS-000352
Group -
The operating system must provide a report generation capability that supports after-the-fact investigations of security incidents.
If the report generation capability does not support after-the-fact investigations, it is difficult to establish, correlate, and investigate the events leading up to an outage or attack or identify...Rule Low Severity -
SRG-OS-000353
Group -
The operating system must not alter original content or time ordering of audit records when it provides an audit reduction capability.
If the audit reduction capability alters the content or time ordering of audit records, the integrity of the audit records is compromised, and the records are no longer usable for forensic analysis...Rule Medium Severity -
SRG-OS-000354
Group -
The operating system must not alter original content or time ordering of audit records when it provides a report generation capability.
If the report generation capability alters the content or time ordering of audit records, the integrity of the audit records is compromised, and the records are no longer usable for forensic analys...Rule Medium Severity -
SRG-OS-000355
Group -
The operating system must, for networked systems, compare internal information system clocks at least every 24 hours with an authoritative time source.
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when condu...Rule Medium Severity -
SRG-OS-000356
Group -
The operating system must synchronize internal information system clocks to the authoritative time source when the time difference is greater than one second.
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when condu...Rule Medium Severity -
SRG-OS-000358
Group -
The operating system must record time stamps for audit records that meet a minimum granularity of one second for a minimum degree of precision.
Without sufficient granularity of time stamps, it is not possible to adequately determine the chronological order of records. Time stamps generated by the operating system include date and time. G...Rule Medium Severity -
SRG-OS-000359
Group -
The operating system must record time stamps for audit records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).
If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analysis. Time stamps generated by the operating system include date and time...Rule Low Severity -
SRG-OS-000360
Group -
The operating system must enforce dual authorization for movement and/or deletion of all audit information, when such movement or deletion is not part of an authorized automatic process.
An authorized user may intentionally or accidentally move or delete audit records without those specific actions being authorized. All bulk manipulation of audit information must be authorized via...Rule Medium Severity -
SRG-OS-000362
Group -
The operating system must prohibit user installation of system software without explicit privileged status.
Allowing regular users to install software, without explicit privileges, creates the risk that untested or potentially malicious software will be installed on the system. Explicit privileges (escal...Rule Medium Severity -
SRG-OS-000363
Group -
The operating system 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-000364
Group -
The operating system must enforce access restrictions.
Failure to provide logical access restrictions associated with changes to system configuration may have significant effects on the overall security of the system. When dealing with access restrict...Rule Medium Severity -
SRG-OS-000365
Group -
The operating system must audit the enforcement actions used to restrict access associated with changes to the system.
Without auditing the enforcement of access restrictions against changes to the application configuration, it will be difficult to identify attempted attacks and an audit trail will not be available...Rule Medium Severity
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