I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000355-GPOS-00143
Group -
The Ubuntu operating system must, for networked systems, compare internal information system clocks at least every 24 hours with a server which is synchronized to one of the redundant United States Naval Observatory (USNO) time servers, or a time server designated for the appropriate DoD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS).
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-GPOS-00144
Group -
The Ubuntu 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 Low Severity -
SRG-OS-000359-GPOS-00146
Group -
The Ubuntu 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-000096-GPOS-00050
Group -
The Ubuntu operating system must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.
In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable...Rule Medium Severity -
SRG-OS-000184-GPOS-00078
Group -
Kernel core dumps must be disabled unless needed.
Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps may consume a considerable amount of disk space and may result in denial of service by e...Rule Medium Severity -
SRG-OS-000278-GPOS-00108
Group -
The Ubuntu operating system must use cryptographic mechanisms to protect the integrity of audit tools.
Protecting the integrity of the tools used for auditing purposes is a critical step toward ensuring the integrity of audit information. Audit information includes all information (e.g., audit recor...Rule Medium Severity -
SRG-OS-000297-GPOS-00115
Group -
The Ubuntu operating system must enable and run the uncomplicated firewall(ufw).
Remote access services, such as those providing remote access to network devices and information systems, which lack automated control capabilities, increase risk and make remote user access manage...Rule Medium Severity -
SRG-OS-000363-GPOS-00150
Group -
The Ubuntu operating system must notify designated personnel if baseline configurations are changed in an unauthorized manner. The file integrity tool must notify the system administrator when changes to the baseline configuration or anomalies in the operation of any security functions are discovered.
Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the Ubuntu operating system. Changes to Ubuntu operating syste...Rule Medium Severity -
SRG-OS-000378-GPOS-00163
Group -
The Ubuntu operating system must disable automatic mounting of Universal Serial Bus (USB) mass storage driver.
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Peripherals include, but are not limited to, such devices as flash drive...Rule Medium Severity -
SRG-OS-000420-GPOS-00186
Group -
The Ubuntu operating system must configure the uncomplicated firewall to rate-limit impacted network interfaces.
DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. This require...Rule Medium Severity
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