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Check: GEN007020

SUSE Linux Enterprise Server v11 for System z STIG: GEN007020 (in versions v1 r12 through v1 r9)

Title

The Stream Control Transmission Protocol (SCTP) must be disabled unless required. (Cat II impact)

Discussion

The Stream Control Transmission Protocol (SCTP) is an Internet Engineering Task Force (IETF)-standardized transport layer protocol. This protocol is not yet widely used. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged local processes may be able to cause the system to dynamically load a protocol handler by opening a socket using the protocol.

Check Content

Verify the SCTP protocol handler is prevented from dynamic loading. # grep 'install sctp' /etc/modprobe.conf /etc/modprobe.conf.local /etc/modprobe.d/* | grep ‘/bin/true’ If no result is returned, this is a finding.

Fix Text

Prevent the SCTP protocol handler for dynamic loading. # echo "install sctp /bin/true" >> /etc/modprobe.conf.local

Additional Identifiers

Rule ID: SV-45968r1_rule

Vulnerability ID: V-22511

Group Title: GEN007020

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000382	The organization configures the information system to prohibit or restrict the use of organization-defined functions, ports, protocols, and/or services.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-7	Least Functionality