Finding ID | Version | Rule ID | IA Controls | Severity |
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V-38513 | RHEL-06-000120 | SV-50314r2_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 | 2018-11-28 |
Check Text ( C-46070r2_chk ) |
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Run the following command to ensure the default "INPUT" policy is "DROP": # iptables -nvL | grep -i input Chain INPUT (policy DROP 0 packets, 0 bytes) If the default policy for the INPUT chain is not set to DROP, this is a finding. |
Fix Text (F-43460r1_fix) |
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To set the default policy to DROP (instead of ACCEPT) for the built-in INPUT chain which processes incoming packets, add or correct the following line in "/etc/sysconfig/iptables": :INPUT DROP [0:0] |