Finding ID | Version | Rule ID | IA Controls | Severity |
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V-38686 | RHEL-06-000320 | SV-50487r1_rule | Medium |
Description |
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In "iptables" the default policy is applied only after all the applicable rules in the table are examined for a match. Setting the default policy to "DROP" implements proper design for a firewall, i.e., any packets which are not explicitly permitted should not be accepted. |
STIG | Date |
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Red Hat Enterprise Linux 6 Security Technical Implementation Guide | 2017-03-01 |
Check Text ( C-46248r1_chk ) |
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Run the following command to ensure the default "FORWARD" policy is "DROP": grep ":FORWARD" /etc/sysconfig/iptables The output must be the following: # grep ":FORWARD" /etc/sysconfig/iptables :FORWARD DROP [0:0] If it is not, this is a finding. |
Fix Text (F-43635r1_fix) |
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To set the default policy to DROP (instead of ACCEPT) for the built-in FORWARD chain which processes packets that will be forwarded from one interface to another, add or correct the following line in "/etc/sysconfig/iptables": :FORWARD DROP [0:0] |