The system must be configured with a default gateway for IPv4 if the system uses IPv4, unless the system is a router.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000366

SV-64105r1_rule The system must be configured with a default gateway for IPv4 if the system uses IPv4, unless the system is a router.

Vulnerability discussion

If a system has no default gateway defined, the system is at increased risk of man-in-the-middle, monitoring, and Denial of Service attacks.

Check content

Check the system for an IPv4 default route. If the system is a VM host and acts as a router solely for the benefit of its client systems, then this rule is not applicable. Procedure: # netstat -r |grep default If a default route is not defined, this is a finding.

Fix text

Set a default gateway for IPv4.

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