Title

The system must be configured with a default gateway for IPv4 if the system uses IPv4, unless the system is a router. (Cat II impact)

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. # netstat -r |grep default If a default route is not defined, this is a finding.

Fix Text

Edit /etc/rc.config.d/netconf and add configuration for a default route. For a default gateway of 192.168.3.1: ROUTE_DESTINATION[0]=default ROUTE_MASK[0]="" ROUTE_GATEWAY[0]=192.168.3.1 ROUTE_COUNT[0]=1 ROUTE_ARGS[0]="" Restart the system for the setting to take effect.

Additional Identifiers

Rule ID: SV-30080r1_rule

Vulnerability ID: V-4397

Group Title: GEN005560

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.