SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-OS-000480-GPOS-00227
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SLEM 5 must be a vendor-supported release.
A SLEM 5 release is considered supported if the vendor continues to provide security patches for the product. With an unsupported release, it will not be possible to resolve security issues discove...Rule High Severity -
SLEM 5 must display the Standard Mandatory DOD Notice and Consent Banner before granting any local or remote connection to the system.
Display of a standardized and approved use notification before granting access to SLEM 5 ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executiv...Rule Medium Severity -
SLEM 5 must restrict access to the kernel message buffer.
Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional system information as a nonprivileged user.Rule Medium Severity -
Address space layout randomization (ASLR) must be implemented by SLEM 5 to protect memory from unauthorized code execution.
Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory inclu...Rule Medium Severity -
Vendor-packaged SLEM 5 security patches and updates must be installed and up to date.
Timely patching is critical for maintaining the operational availability, confidentiality, and integrity of information technology (IT) systems. However, failure to keep SLEM 5 and application soft...Rule Medium Severity -
SLEM 5 must use vlock to allow for session locking.
A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary...Rule Medium Severity -
SLEM 5 must not have the telnet-server package installed.
It is detrimental for SLEM 5 to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked, and ther...Rule High Severity -
SLEM 5 file systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.
The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files, as they may be incompatible. Exe...Rule Medium Severity -
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.
The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" ...Rule Medium Severity -
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.
The "nosuid" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be used for mounting any file system not containing approved setuid and se...Rule Medium Severity -
SLEM 5 must have system commands set to a mode of 755 or less permissive.
If SLEM 5 were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust ch...Rule Medium Severity -
SLEM 5 library files must be owned by root.
If SLEM 5 were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust ch...Rule Medium Severity -
SLEM 5 must have system commands group-owned by root or a system account.
If SLEM 5 were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust ch...Rule Medium Severity -
The sticky bit must be set on all SLEM 5 world-writable directories.
Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of ...Rule Medium Severity -
SLEM 5 must generate error messages that provide information necessary for corrective actions without revealing information that could be exploited by adversaries.
Any operating system providing too much information in error messages risks compromising the data and security of the structure, and content of error messages needs to be carefully considered by th...Rule Medium Severity -
SLEM 5 clock must, for networked systems, be synchronized to an authoritative DOD time source at least every 24 hours.
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when condu...Rule Medium Severity -
SLEM 5 must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly r...Rule Medium Severity -
SLEM 5 must not allow interfaces to send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages by default.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly r...Rule Medium Severity -
SLEM 5 must be configured to use TCP syncookies.
Denial of service (DoS) is a condition in which a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded...Rule Medium Severity
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