Red Hat Enterprise Linux 9 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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RHEL 9 must disable storing core dumps.
<VulnDiscussion>A core dump includes a memory image taken at the time the operating system terminates an application. The memory image could ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must disable core dumps for all users.
<VulnDiscussion>A core dump includes a memory image taken at the time the operating system terminates an application. The memory image could ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must disable acquiring, saving, and processing core dumps.
<VulnDiscussion>A core dump includes a memory image taken at the time the operating system terminates an application. The memory image could ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must disable the use of user namespaces.
<VulnDiscussion>User namespaces are used primarily for Linux containers. The value "0" disallows the use of user namespaces.</VulnDiscussi...Rule Medium Severity -
SRG-OS-000433-GPOS-00192
<GroupDescription></GroupDescription>Group -
RHEL 9 must implement nonexecutable data to protect its memory from unauthorized code execution.
<VulnDiscussion>ExecShield uses the segmentation feature on all x86 systems to prevent execution in memory higher than a certain address. It ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The kdump service on RHEL 9 must be disabled.
<VulnDiscussion>Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps consume a consid...Rule Medium Severity -
SRG-OS-000366-GPOS-00153
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have unauthorized IP tunnels configured.
<VulnDiscussion>IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the inf...Rule Medium Severity -
RHEL 9 must check the GPG signature of software packages originating from external software repositories before installation.
<VulnDiscussion>Changes to any software components can have significant effects on the overall security of the operating system. This require...Rule High Severity -
SRG-OS-000366-GPOS-00153
<GroupDescription></GroupDescription>Group -
RHEL 9 must check the GPG signature of locally installed software packages before installation.
<VulnDiscussion>Changes to any software components can have significant effects on the overall security of the operating system. This require...Rule High Severity -
SRG-OS-000366-GPOS-00153
<GroupDescription></GroupDescription>Group -
RHEL 9 must have GPG signature verification enabled for all software repositories.
<VulnDiscussion>Changes to any software components can have significant effects on the overall security of the operating system. This require...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must be configured so that the cryptographic hashes of system files match vendor values.
<VulnDiscussion>The hashes of important files like system executables should match the information given by the RPM database. Executables wit...Rule Medium Severity -
SRG-OS-000437-GPOS-00194
<GroupDescription></GroupDescription>Group -
RHEL 9 must remove all 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 Low Severity -
SRG-OS-000366-GPOS-00153
<GroupDescription></GroupDescription>Group -
RHEL 9 subscription-manager package must be installed.
<VulnDiscussion>The Red Hat Subscription Manager application manages software subscriptions and software repositories for installed software ...Rule Medium Severity -
SRG-OS-000074-GPOS-00042
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have a File Transfer Protocol (FTP) server package installed.
<VulnDiscussion>The FTP service provides an unencrypted remote access that does not provide for the confidentiality and integrity of user pas...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the sendmail package installed.
<VulnDiscussion>The sendmail software was not developed with security in mind, and its design prevents it from being effectively contained by...Rule Medium Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the nfs-utils package installed.
<VulnDiscussion>"nfs-utils" provides a daemon for the kernel NFS server and related tools. This package also contains the "showmount" program...Rule Medium Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the ypserv package installed.
<VulnDiscussion>The NIS service provides an unencrypted authentication service, which does not provide for the confidentiality and integrity ...Rule Medium Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the rsh-server package installed.
<VulnDiscussion>The "rsh-server" service provides unencrypted remote access service, which does not provide for the confidentiality and integ...Rule Medium Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the telnet-server package installed.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the gssproxy package installed.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
RHEL 9 must not have the iprutils package installed.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000095-GPOS-00049
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the tuned package installed.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have a Trivial File Transfer Protocol (TFTP) server package installed.
<VulnDiscussion>Removing the "tftp-server" package decreases the risk of the accidental (or intentional) activation of tftp services. If TFT...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have the quagga package installed.
<VulnDiscussion>Quagga is a network routing software suite providing implementations of Open Shortest Path First (OSPF), Routing Information ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
A graphical display manager must not be installed on RHEL 9 unless approved.
<VulnDiscussion>Unnecessary service packages must not be installed to decrease the attack surface of the system. Graphical display managers h...Rule Medium Severity -
SRG-OS-000105-GPOS-00052
<GroupDescription></GroupDescription>Group -
RHEL 9 must use a separate file system for /var.
<VulnDiscussion>Ensuring that "/var" is mounted on its own partition enables the setting of more restrictive mount options. This helps protec...Rule Low Severity
Node 2
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