STIGQter: STIG Summary: Oracle Linux 6 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The systems local IPv4 firewall must implement a deny-all, allow-by-exception policy for inbound packets.

DISA Rule

SV-219554r603263_rule

Vulnerability Number

V-219554

Group Title

SRG-OS-000480

Rule Version

OL6-00-000120

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

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]

Check Contents

Inspect the file "/etc/sysconfig/iptables" to determine the default policy for the INPUT chain. It should be set to DROP.

# grep ":INPUT" /etc/sysconfig/iptables

If the default policy for the INPUT chain is not set to DROP, this is a finding.

Vulnerability Number

V-219554

Documentable

False

Rule Version

OL6-00-000120

Severity Override Guidance

Inspect the file "/etc/sysconfig/iptables" to determine the default policy for the INPUT chain. It should be set to DROP.

# grep ":INPUT" /etc/sysconfig/iptables

If the default policy for the INPUT chain is not set to DROP, this is a finding.

Check Content Reference

M

Target Key

2928

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