Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-OS-000080-GPOS-00048
Group -
Ubuntu operating systems booted with United Extensible Firmware Interface (UEFI) implemented must require authentication upon booting into single-user mode and maintenance.
To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must be...Rule High Severity -
SRG-OS-000254-GPOS-00095
Group -
The Ubuntu operating system must initiate session audits at system startup.
If auditing is enabled late in the startup process, the actions of some startup processes may not be audited. Some audit systems also maintain state information only available if auditing is enable...Rule Medium Severity -
SRG-OS-000185-GPOS-00079
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SRG-OS-000478-GPOS-00223
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SRG-OS-000343-GPOS-00134
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The Ubuntu operating system must immediately notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75% 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-000479-GPOS-00224
Group -
The Ubuntu operating system audit event multiplexor must be configured to off-load audit logs onto a different system in real time, if the system is interconnected.
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-000479-GPOS-00224
Group -
The Ubuntu operating system must have a crontab script running weekly to off-load audit events of standalone systems.
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-000366-GPOS-00153
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SRG-OS-000437-GPOS-00194
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The Ubuntu operating system must be configured so that Advance package Tool (APT) removes 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-000095-GPOS-00049
Group -
The Ubuntu operating system must not have the Network Information Service (NIS) package installed.
Removing the Network Information Service (NIS) package decreases the risk of the accidental (or intentional) activation of NIS or NIS+ services.Rule High Severity -
SRG-OS-000095-GPOS-00049
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SRG-OS-000191-GPOS-00080
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The Ubuntu operating system must deploy Endpoint Security for Linux Threat Prevention (ENSLTP).
Without the use of automated mechanisms to scan for security flaws on a continuous and/or periodic basis, the operating system or other system components may remain vulnerable to the exploits prese...Rule Medium Severity -
SRG-OS-000269-GPOS-00103
Group -
The Ubuntu operating system must be configured to preserve log records from failure events.
Failure to a known state can address safety or security in accordance with the mission/business needs of the organization. Failure to a known secure state helps prevent a loss of confidentiality, i...Rule Medium Severity -
SRG-OS-000297-GPOS-00115
Group -
SRG-OS-000342-GPOS-00133
Group -
The Ubuntu operating system audit event multiplexor must be configured to off-load audit logs onto a different system or storage 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-000383-GPOS-00166
Group -
The Ubuntu operating system must be configured such that Pluggable Authentication Module (PAM) prohibits the use of cached authentications after one day.
If cached authentication information is out-of-date, the validity of the authentication information may be questionable.Rule Low Severity -
SRG-OS-000480-GPOS-00226
Group -
The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.
Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account.Rule Low Severity -
SRG-OS-000480-GPOS-00227
Group -
The Ubuntu operating system must display the date and time of the last successful account logon upon logon.
Configuring the Ubuntu operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common secu...Rule Low Severity -
SRG-OS-000021-GPOS-00005
Group -
The Ubuntu operating system must be configured so that three consecutive invalid logon attempts by a user automatically locks the account until released by an administrator.
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking...Rule Medium Severity -
SRG-OS-000024-GPOS-00007
Group -
SRG-OS-000109-GPOS-00056
Group -
The Ubuntu operating system must prevent direct login into the root account.
To assure individual accountability and prevent unauthorized access, organizational users must be individually identified and authenticated. A group authenticator is a generic account used by mult...Rule Medium Severity -
SRG-OS-000134-GPOS-00068
Group -
The Ubuntu operating system must be configured so that only users who need access to security functions are part of the sudo group.
An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform security functions. Security functions are the hardware, software, and...Rule High Severity -
SRG-OS-000228-GPOS-00088
Group -
SRG-OS-000069-GPOS-00037
Group -
The Ubuntu operating system must enforce password complexity by requiring that at least one upper-case character be used.
Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resistin...Rule Low Severity -
SRG-OS-000070-GPOS-00038
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SRG-OS-000071-GPOS-00039
Group -
The Ubuntu operating system must enforce password complexity by requiring that at least one numeric character be used.
Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resistin...Rule Low Severity -
SRG-OS-000072-GPOS-00040
Group -
SRG-OS-000073-GPOS-00041
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The Ubuntu operating system must encrypt all stored passwords with a FIPS 140-2 approved cryptographic hashing algorithm.
Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily c...Rule Medium Severity -
SRG-OS-000074-GPOS-00042
Group -
The Ubuntu operating system must not have the telnet package installed.
Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily c...Rule High Severity -
SRG-OS-000075-GPOS-00043
Group
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