Rule version TOSS-05-000107 · STIG v1 · 2026-08-20
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 SCTP is a transport layer protocol, designed to support the idea of message-oriented communication, with several streams of messages within one connection. Disabling SCTP protects the system against exploitation of any flaws in its implementation.
Verify TOSS 5 disables the ability to load the "sctp" kernel module using the following command:
$ sudo grep -r sctp /etc/modprobe.conf /etc/modprobe.d/*
blacklist sctp
If the command does not return any output, or the line is commented out, and use of sctp is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
To configure the system to prevent the "sctp" kernel module from being loaded, add the following line to the file /etc/modprobe.d/sctp.conf (or create sctp.conf if it does not exist):
install sctp /bin/false blacklist sctp