Guide to the Secure Configuration of SUSE Linux Enterprise 12
Rules, Groups, and Values defined within the XCCDF Benchmark
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Set SSH authentication attempt limit
The <code>MaxAuthTries</code> parameter specifies the maximum number of authentication attempts permitted per connection. Once the number of failures reaches half this value, additional failures ar...Rule Medium Severity -
Use Only Strong Key Exchange algorithms
Limit the Key Exchange to strong algorithms. The following line in <code>/etc/ssh/sshd_config</code> demonstrates use of those: <pre>KexAlgorithms <xccdf-1.2:sub idref="xccdf_org.ssgproject.content...Rule Medium Severity -
Remove the X Windows Package Group
By removing the xorg-x11-server-common package, the system no longer has X Windows installed. If X Windows is not installed then the system cannot boot into graphical user mode. This prevents the s...Rule Medium Severity -
Disable graphical user interface
By removing the following packages, the system no longer has X Windows installed. <code>xorg-x11-server-Xorg xorg-x11-server-common xorg-x11-server-utils xorg-x11-server-Xwayland</code> If X Win...Rule Medium Severity -
Enable Auditing for Processes Which Start Prior to the Audit Daemon
To ensure all processes can be audited, even those which start prior to the audit daemon, add the argument <code>audit=1</code> to the default GRUB 2 command line for the Linux operating system. Co...Rule Low Severity -
Extend Audit Backlog Limit for the Audit Daemon
To improve the kernel capacity to queue all log events, even those which occurred prior to the audit daemon, add the argument <code>audit_backlog_limit=8192</code> to the default GRUB 2 command lin...Rule Low Severity -
Configure auditd Data Retention
The audit system writes data to <code>/var/log/audit/audit.log</code>. By default, <code>auditd</code> rotates 5 logs by size (6MB), retaining a maximum of 30MB of data in total, and refuses to wri...Group -
Make the auditd Configuration Immutable
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following line to a file with suffix <cod...Rule Medium Severity -
Record Events that Modify the System's Mandatory Access Controls in usr/share
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following line to a file with suffix <cod...Rule Medium Severity -
Record Events that Modify the System's Network Environment
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...Rule Medium Severity -
Record Attempts to Alter Process and Session Initiation Information
The audit system already collects process information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during d...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/group
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/gshadow
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/security/opasswd
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/passwd
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...Rule Medium Severity -
System Audit Logs Must Have Mode 0750 or Less Permissive
If <code>log_group</code> in <code>/etc/audit/auditd.conf</code> is set to a group other than the <code>root</code> group account, change the mode of the audit log files with the following command...Rule Medium Severity -
Audit Configuration Files Must Be Owned By Group root
All audit configuration files must be owned by group root.chown :root /etc/audit/audit*.{rules,conf} /etc/audit/rules.d/*Rule Medium Severity -
Audit Configuration Files Must Be Owned By Root
All audit configuration files must be owned by root user. To properly set the owner of <code>/etc/audit/</code>, run the command: <pre>$ sudo chown root /etc/audit/ </pre> To properly set the own...Rule Medium Severity -
System Audit Logs Must Be Owned By Root
All audit logs must be owned by root user and group. By default, the path for audit log is <pre>/var/log/audit/</pre>. To properly set the owner of <code>/var/log/audit</code>, run the command: <p...Rule Medium Severity -
Audit Configuration Files Permissions are 640 or More Restrictive
All audit configuration files permissions must be 640 or more restrictive.chmod 0640 /etc/audit/audit*.{rules,conf} /etc/audit/rules.d/*Rule Medium Severity -
System Audit Logs Must Have Mode 0640 or Less Permissive
If <code>log_group</code> in <code>/etc/audit/auditd.conf</code> is set to a group other than the <code>root</code> group account, change the mode of the audit log files with the following command...Rule Medium Severity -
Record Execution Attempts to Run ACL Privileged Commands
At a minimum, the audit system should collect the execution of ACL privileged commands for all users and root.Group -
Record File Deletion Events by User
At a minimum, the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit r...Group -
Record Unauthorized Access Attempts Events to Files (unsuccessful)
At a minimum, the audit system should collect unauthorized file accesses for all users and root. Note that the "-F arch=b32" lines should be present even on a 64 bit system. These commands identify...Group -
Record Information on Kernel Modules Loading and Unloading
To capture kernel module loading and unloading events, use following lines, setting ARCH to either b32 for 32-bit system, or having two lines for both b32 and b64 in case your system is 64-bit: <pr...Group -
Record Information on the Use of Privileged Commands
At a minimum, the audit system should collect the execution of privileged commands for all users and root.Group -
Record Events that Modify the System's Discretionary Access Controls - chmod
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - fchmod
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - fchmodat
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - fchown
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - fchownat
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - fsetxattr
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - lchown
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - lremovexattr
At a minimum, the audit system should collect file permission changes for all users and root. <br> <br> If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> pr...Rule Medium Severity -
Record Any Attempts to Run chacl
At a minimum, the audit system should collect any execution attempt of the <code>chacl</code> command for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - removexattr
At a minimum, the audit system should collect file permission changes for all users and root. <br> <br> If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> pr...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - setxattr
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - umount
At a minimum, the audit system should collect file system umount changes. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemo...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - umount2
At a minimum, the audit system should collect file system umount2 changes. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daem...Rule Medium Severity -
Record Any Attempts to Run chcon
At a minimum, the audit system should collect any execution attempt of the <code>chcon</code> command for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User
At a minimum the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit ru...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User - renameat
At a minimum, the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit r...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User - rmdir
At a minimum, the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit r...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User - unlink
At a minimum, the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit r...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User - unlinkat
At a minimum, the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit r...Rule Medium Severity -
Ensure auditd Collects Unauthorized Access Attempts to Files (unsuccessful)
At a minimum the audit system should collect unauthorized file accesses for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read au...Rule Medium Severity -
Record Unsuccessful Access Attempts to Files - open
At a minimum, the audit system should collect unauthorized file accesses for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read a...Rule Medium Severity -
Record Unsuccessful Access Attempts to Files - open_by_handle_at
At a minimum, the audit system should collect unauthorized file accesses for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read a...Rule Medium Severity -
Record Unsuccessful Delete Attempts to Files - rename
The audit system should collect unsuccessful file deletion attempts for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit ...Rule Medium Severity -
Record Unsuccessful Delete Attempts to Files - renameat
The operating system must generate audit records for all uses of the <code>renameat</code> system call. Without generating audit records specific to the security and mission needs of the organizat...Rule Medium Severity
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