Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-OS-000329-GPOS-00128
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts have been made.
<VulnDiscussion>By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise...Rule Low Severity -
SRG-OS-000446-GPOS-00200
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must be configured so that the script which runs each 30 days or less to check file integrity is the default one.
<VulnDiscussion>Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed...Rule Medium Severity -
SRG-OS-000480-GPOS-00226
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.
<VulnDiscussion>Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain acc...Rule Low Severity -
SRG-OS-000004-GPOS-00004
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must permit only authorized groups ownership of the audit log files.
<VulnDiscussion>Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confide...Rule Medium Severity -
SRG-OS-000059-GPOS-00029
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd.
<VulnDiscussion>Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...Rule Medium Severity
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