AlmaLinux OS 9 must disable the Transparent Inter Process Communication (TIPC) kernel module.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-269347	SRG-OS-000095-GPOS-00049	ALMA-09-030270	SV-269347r1050229_rule	2025-02-20	1

Description
It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Failing to disconnect unused protocols can result in a system compromise. The TIPC is a protocol that is specially designed for intra-cluster communication. It can be configured to transmit messages either on UDP or directly across Ethernet. Message delivery is sequence guaranteed, loss free and flow controlled. Disabling TIPC protects the system against exploitation of any flaws in its implementation.

Description

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Failing to disconnect unused protocols can result in a system compromise. The TIPC is a protocol that is specially designed for intra-cluster communication. It can be configured to transmit messages either on UDP or directly across Ethernet. Message delivery is sequence guaranteed, loss free and flow controlled. Disabling TIPC protects the system against exploitation of any flaws in its implementation.

ℹ️ Check
Verify that AlmaLinux OS 9 disables the ability to load the TIPC kernel module with the following command: $ grep -r tipc /etc/modprobe.conf /etc/modprobe.d/* /etc/modprobe.d/tipc.conf:install tipc /bin/false /etc/modprobe.d/tipc.conf:blacklist tipc If the command does not return any output, or the line is commented out, and use of TIPC is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

ℹ️ Check

Verify that AlmaLinux OS 9 disables the ability to load the TIPC kernel module with the following command: $ grep -r tipc /etc/modprobe.conf /etc/modprobe.d/* /etc/modprobe.d/tipc.conf:install tipc /bin/false /etc/modprobe.d/tipc.conf:blacklist tipc If the command does not return any output, or the line is commented out, and use of TIPC is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

✔️ Fix
To configure the system to prevent the TIPC kernel module from being loaded, run the following command: $ cat << EOF \| tee /etc/modprobe.d/tipc.conf install tipc /bin/false blacklist tipc EOF