Vulnerability Discussion
Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.
Check
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.
Check to see if 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 Information System Security Officer (ISSO) as an operational requirement, this is a finding.
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