The Oracle Linux operating system must be configured so that the Datagram Congestion Control Protocol (DCCP) kernel module is disabled unless required.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221713	OL07-00-020101	SV-221713r603260_rule		Medium

Description
Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.

STIG	Date
Oracle Linux 7 Security Technical Implementation Guide	2021-06-14

Details

Check Text ( C-36274r602416_chk )
Verify the operating system disables the ability to load the DCCP kernel module. # grep -r dccp /etc/modprobe.d/* \| grep -i "/bin/true" \| grep -v "^#" install dccp /bin/true If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use the DCCP kernel module. Verify the DCCP kernel module is disabled with the following command: # grep -i dccp /etc/modprobe.d/* \| grep -i "blacklist" \| grep -v "^#" blacklist dccp If the command does not return any output or the output is not "blacklist dccp", and use of the DCCP kernel module is not documented with the ISSO as an operational requirement, this is a finding.

Check Text ( C-36274r602416_chk )

Verify the operating system disables the ability to load the DCCP kernel module.

# grep -r dccp /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#"

install dccp /bin/true

If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Verify the operating system disables the ability to use the DCCP kernel module.

Verify the DCCP kernel module is disabled with the following command:

# grep -i dccp /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#"

blacklist dccp

If the command does not return any output or the output is not "blacklist dccp", and use of the DCCP kernel module is not documented with the ISSO as an operational requirement, this is a finding.

Fix Text (F-36238r602417_fix)
Configure the operating system to disable the ability to use the DCCP kernel module. Create a file under "/etc/modprobe.d" with the following command: # touch /etc/modprobe.d/dccp.conf Add the following line to the created file: install dccp /bin/true Ensure that the DCCP module is blacklisted: # vi /etc/modprobe.d/blacklist.conf Add or update the line: blacklist dccp