Oracle Linux 5 Security Technical Implementation Guide

The Oracle Linux 5 Security Technical Implementation Guide (V2 R1) has 571 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V2 · R1

CurrentPublished Fri Jan 22 2021

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

Oracle Linux 5 Security Technical Implementation Guide

Assessment Title

Rule Text

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

Description

Discussion Text

A local firewall protects the system from exposing unnecessary or undocumented network services to the local enclave. If a system within the enclave is compromised, firewall protection on an individual system continues to protect it from attack.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-218718

Rule

SV-218718r603259_rule

Severity

medium

Rule Version

GEN008540

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Check the firewall rules for a default deny rule.

# iptables --list

Example of a rule meeting this criteria:
REJECT    all  --  anywhere          anywhere         reject-with icmp-host-prohibited

A rule using DROP is also acceptable.  The default rule should be the last rule of a table and match all traffic.

If there is no default deny rule, this is a finding.

Implementation Procedure

Fix Text

Edit "/etc/sysconfig/iptables" and add a default deny rule.

An example of a default deny rule:
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited

Restart the iptable service.
# service iptables restart

STIG check 556 of 571 in the Oracle Linux 5 STIG checklist

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