I - Mission Critical Sensitive
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000191-GPOS-00080
<GroupDescription></GroupDescription>Group -
SLEM 5 must implement an endpoint security tool.
<VulnDiscussion>Adding endpoint security tools can provide the capability to automatically take actions in response to malicious behavior, wh...Rule Medium Severity -
SRG-OS-000023-GPOS-00006
<GroupDescription></GroupDescription>Group -
SLEM 5 must display the Standard Mandatory DOD Notice and Consent Banner before granting any local or remote connection to the system.
<VulnDiscussion>Display of a standardized and approved use notification before granting access to SLEM 5 ensures privacy and security notific...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 must disable the x86 Ctrl-Alt-Delete key sequence.
<VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete when at the console can reboot the system. If accidentally pressed, as c...Rule High Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
SLEM 5 with a basic input/output system (BIOS) must require authentication upon booting into single-user and maintenance modes.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DOD-ap...Rule High Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
SLEM 5 with Unified Extensible Firmware Interface (UEFI) implemented must require authentication upon booting into single-user mode and maintenance.
<VulnDiscussion>If the system allows a user to boot into single-user or maintenance mode without authentication, any user that invokes single...Rule High Severity -
SRG-OS-000138-GPOS-00069
<GroupDescription></GroupDescription>Group -
SLEM 5 must restrict access to the kernel message buffer.
<VulnDiscussion>Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional s...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 kernel core dumps must be disabled unless needed.
<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-000433-GPOS-00193
<GroupDescription></GroupDescription>Group -
Address space layout randomization (ASLR) must be implemented by SLEM 5 to protect memory from unauthorized code execution.
<VulnDiscussion>Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations t...Rule Medium Severity -
SRG-OS-000433-GPOS-00192
<GroupDescription></GroupDescription>Group -
SLEM 5 must implement kptr-restrict to prevent the leaking of internal kernel addresses.
<VulnDiscussion>Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations t...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
Vendor-packaged SLEM 5 security patches and updates must be installed and up to date.
<VulnDiscussion>Timely patching is critical for maintaining the operational availability, confidentiality, and integrity of information techn...Rule Medium Severity -
SRG-OS-000366-GPOS-00153
<GroupDescription></GroupDescription>Group -
The SLEM 5 tool zypper must have gpgcheck enabled.
<VulnDiscussion>Changes to any software components can have significant effects on the overall security of SLEM 5. This requirement ensures t...Rule High Severity -
SRG-OS-000437-GPOS-00194
<GroupDescription></GroupDescription>Group -
SLEM 5 must remove all outdated software components after updated versions have been installed.
<VulnDiscussion>Previous versions of software components that are not removed from the information system after updates have been installed m...Rule Medium Severity -
SRG-OS-000028-GPOS-00009
<GroupDescription></GroupDescription>Group -
SLEM 5 must use vlock to allow for session locking.
<VulnDiscussion>A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the ...Rule Medium Severity -
SRG-OS-000074-GPOS-00042
<GroupDescription></GroupDescription>Group -
SLEM 5 must not have the telnet-server package installed.
<VulnDiscussion>It is detrimental for SLEM 5 to provide, or install by default, functionality exceeding requirements or mission objectives. T...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
A separate file system must be used for SLEM 5 user home directories (such as /home or an equivalent).
<VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becomi...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 must use a separate file system for /var.
<VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becomi...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 must use a separate file system for the system audit data path.
<VulnDiscussion>The use of separate file systems for different paths can protect the system from failures resulting from a file system becomi...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 file systems that are being imported via Network File System (NFS) must be mounted to prevent files with the setuid and setgid bit set from being executed.
<VulnDiscussion>The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option mus...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 file systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.
<VulnDiscussion>The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file syste...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 file systems that are used with removable media must be mounted to prevent files with the setuid and setgid bit set from being executed.
<VulnDiscussion>The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option mus...Rule Medium Severity -
SRG-OS-000185-GPOS-00079
<GroupDescription></GroupDescription>Group -
All SLEM 5 persistent disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at-rest protection.
<VulnDiscussion>SLEM 5 handling data requiring data-at-rest protections must employ cryptographic mechanisms to prevent unauthorized disclosu...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SLEM 5 file systems that contain user home directories must be mounted to prevent files with the setuid and setgid bit set from being executed.
<VulnDiscussion>The "nosuid" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be...Rule Medium Severity -
SRG-OS-000114-GPOS-00059
<GroupDescription></GroupDescription>Group -
SLEM 5 must disable the file system automounter unless required.
<VulnDiscussion>Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity.<...Rule Medium Severity -
SRG-OS-000259-GPOS-00100
<GroupDescription></GroupDescription>Group -
SLEM 5 must have directories that contain system commands set to a mode of 755 or less permissive.
<VulnDiscussion>If SLEM 5 were to allow any user to make changes to software libraries, then those changes might be implemented without under...Rule Medium Severity -
SRG-OS-000259-GPOS-00100
<GroupDescription></GroupDescription>Group -
SLEM 5 must have system commands set to a mode of 755 or less permissive.
<VulnDiscussion>If SLEM 5 were to allow any user to make changes to software libraries, then those changes might be implemented without under...Rule Medium Severity
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