Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Ubuntu operating system must not have the telnet package installed.
<VulnDiscussion>Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are...Rule High Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must not have the rsh-server package installed.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule High Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>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.
<VulnDiscussion>In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....Rule Medium Severity -
SRG-OS-000109-GPOS-00056
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must prevent direct login into the root account.
<VulnDiscussion>To assure individual accountability and prevent unauthorized access, organizational users must be individually identified and...Rule Medium Severity -
SRG-OS-000118-GPOS-00060
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must disable account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity.
<VulnDiscussion>Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potenti...Rule Medium Severity -
SRG-OS-000123-GPOS-00064
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must automatically expire temporary accounts within 72 hours.
<VulnDiscussion>Temporary accounts are privileged or nonprivileged accounts that are established during pressing circumstances, such as new s...Rule Low Severity -
SRG-OS-000138-GPOS-00069
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must set a sticky bit on all public directories to prevent unauthorized and unintended information transferred via shared system resources.
<VulnDiscussion>Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of infor...Rule Medium Severity -
SRG-OS-000142-GPOS-00071
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must be configured to use TCP syncookies.
<VulnDiscussion>DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot ac...Rule Medium Severity -
SRG-OS-000184-GPOS-00078
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must disable kernel core dumps so that it can fail to a secure state if system initialization fails, shutdown fails or aborts fail.
<VulnDiscussion>Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps may consume a co...Rule Medium Severity -
SRG-OS-000185-GPOS-00079
<GroupDescription></GroupDescription>Group -
Ubuntu operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.
<VulnDiscussion>Information at rest refers to the state of information when it is located on a secondary storage device (e.g., disk drive and...Rule Medium Severity -
SRG-OS-000205-GPOS-00083
<GroupDescription></GroupDescription>Group
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