Title

The Red Hat Enterprise Linux operating system must be configured so that the Datagram Congestion Control Protocol (DCCP) kernel module is disabled unless required. (Cat II impact)

Discussion

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

Check Content

Verify the operating system disables the ability to load the DCCP kernel module. # grep -r dccp /etc/modprobe.d/* | grep -i "/bin/false" | grep -v "^#" install dccp /bin/false 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 ISSO as an operational requirement, this is a finding.

Fix Text

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/false Ensure that the DCCP module is blacklisted: # vi /etc/modprobe.d/blacklist.conf Add or update the line: blacklist dccp

Additional Identifiers

Rule ID: SV-204450r958820_rule

Vulnerability ID: V-204450

Group Title: SRG-OS-000378-GPOS-00163

Expert Comments

CCIs tied to check.

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