Guide to the Secure Configuration of SUSE Linux Enterprise 12
Rules, Groups, and Values defined within the XCCDF Benchmark
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Enable DoS Protections in SuSEfirewall2
The <code>SuSEfirewall2</code> package can be installed with the following command: <pre> $ sudo zypper install SuSEfirewall2</pre> The <code>SuSEfirewall2</code> service can be enabled with the f...Rule Medium Severity -
Only Allow Authorized Network Services in SuSEfirewall2
The <code>SuSEfirewall2</code> package can be installed with the following command: <pre> $ sudo zypper install SuSEfirewall2</pre> The <code>SuSEfirewall2</code> service can be enabled with the f...Rule Medium Severity -
Uncomplicated Firewall (ufw)
The Linux kernel in Ubuntu provides a packet filtering system called netfilter, and the traditional interface for manipulating netfilter are the iptables suite of commands. iptables provide a compl...Group -
Verify ufw Enabled
Theufwservice can be enabled with the following command:$ sudo systemctl enable ufw.service
Rule Medium Severity -
Uncommon Network Protocols
The system includes support for several network protocols which are not commonly used. Although security vulnerabilities in kernel networking code are not frequently discovered, the consequences ca...Group -
Disable DCCP Support
The Datagram Congestion Control Protocol (DCCP) is a relatively new transport layer protocol, designed to support streaming media and telephony. To configure the system to prevent the <code>dccp</...Rule Medium Severity -
Disable RDS Support
The Reliable Datagram Sockets (RDS) protocol is a transport layer protocol designed to provide reliable high-bandwidth, low-latency communications between nodes in a cluster. To configure the syst...Rule Low Severity -
Disable Wireless Through Software Configuration
If it is impossible to remove the wireless hardware from the device in question, disable as much of it as possible through software. The following methods can disable software support for wireless ...Group -
Deactivate Wireless Network Interfaces
Deactivating wireless network interfaces should prevent normal usage of the wireless capability. <br> <br> Configure the system to disable wireless network interfaces by issuing the follo...Rule Medium Severity -
File Permissions and Masks
Traditional Unix security relies heavily on file and directory permissions to prevent unauthorized users from reading or modifying files to which they should not have access. <br> <br> Severa...Group -
Verify Permissions on Important Files and Directories
Permissions for many files on a system must be set restrictively to ensure sensitive information is properly protected. This section discusses important permission restrictions which can be verifie...Group -
Ensure All World-Writable Directories Are Owned by root User
All directories in local partitions which are world-writable should be owned by root. If any world-writable directories are not owned by root, this should be investigated. Following this, the files...Rule Medium Severity -
Verify Group Who Owns Backup group File
To properly set the group owner of/etc/group-, run the command:$ sudo chgrp root /etc/group-
Rule Medium Severity -
Ensure All World-Writable Directories Are Group Owned by a System Account
All directories in local partitions which are world-writable should be group owned by root or another system account. If any world-writable directories are not group owned by a system account, this...Rule Medium Severity -
Verify that system commands directories have root ownership
System commands are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin </pre> All these directories should be owned by the <code>...Rule Medium Severity -
Verify Permissions on System.map Files
The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and their corresponding memory addresses. In general,...Rule Low Severity -
Ensure All SGID Executables Are Authorized
The SGID (set group id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthorized SGID files is determine if any were not install...Rule Medium Severity -
Ensure All SUID Executables Are Authorized
The SUID (set user id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthorized SUID files is determine if any were not installe...Rule Medium Severity -
Verify permissions of log files
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 -
Enable Kernel Parameter to Enforce DAC on Hardlinks
To set the runtime status of the <code>fs.protected_hardlinks</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protected_hardlinks=1</pre> To make sure that the setting ...Rule Medium Severity
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