The SuSEfirewall2 package can be installed with the following command:
$ sudo dnf install SuSEfirewall2
The SuSEfirewall2 package should be installed to provide access control methods.
The SuSEfirewall2 service can be enabled with the following command:
$ sudo systemctl enable SuSEfirewall2.service
To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. SUSE operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component.
The SuSEfirewall2 package can be installed with the following command:
$ sudo dnf install SuSEfirewall2The
SuSEfirewall2 service can be enabled with the following command:
$ sudo systemctl enable SuSEfirewall2.serviceVerify "SuSEfirewall2" is configured to protect the SUSE operating system against or limit the effects of DoS attacks. Run the following command:
# grep -i fw_services_accept_ext /etc/sysconfig/SuSEfirewall2 FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh"If the "FW_SERVICES_ACCEPT_EXT" rule does not contain both the hitcount and blockseconds parameters, this is a finding.
DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. This requirement addresses the configuration of the SUSE operating system to mitigate the impact on system availability of DoS attacks that have occurred or are ongoing. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.
The SuSEfirewall2 package can be installed with the following command:
$ sudo dnf install SuSEfirewall2The
SuSEfirewall2 service can be enabled with the following command:
$ sudo systemctl enable SuSEfirewall2.serviceCheck the firewall configuration for any unnecessary or prohibited functions, ports, protocols, and/or services by running the following command:
# grep ^FW_ /etc/sysconfig/SuSEfirewall2 FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh"Ask the System Administrator for the site or program PPSM Component Local Services Assessment (Component Local Services Assessment (CLSA). Verify the services allowed by the firewall match the PPSM CLSA.
To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. SUSE operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the SUSE operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or address authorized quality-of-life issues.