Details

Preventing direct root login to serial port interfaces helps ensure accountability for actions taken on the systems using the root account.

Solution

To restrict root logins on serial ports, ensure lines of this form do not appear in ‘/etc/securetty’:

ttyS0
ttyS1

Note: Serial port entries are not limited to those listed above. Any lines starting with ‘ttyS’ followed by numerals should be removed.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Linux_6_V1R18_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Unix.

References

• 800-53|IA-2(5)
• CAT|III
• CCI|CCI-000770
• Group-ID|V-50725
• Rule-ID|SV-208805r603263_rule
• STIG-ID|OL6-00-000028
• STIG-Legacy|SV-64931
• STIG-Legacy|V-50725
• Vuln-ID|V-208805

Source

• Tenable.com/audits