The system must be configured with a default gateway for IPv6 if the system uses IPv6, unless the system is a router.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000366

SV-64107r1_rule The system must be configured with a default gateway for IPv6 if the system uses IPv6, 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 for a default route for IPv6. 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. # ip -6 route list | grep default If the system uses IPv6, and no results are returned, this is a finding.

Fix text

Add a default route for IPv6. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 (substitute interface as appropriate). Add an IPV6_DEFAULTGW= configuration setting. Restart the interface. # ifdown eth0; ifup eth0

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