The Cisco ISR 4000 Series router must have IP source routing disabled.

From Cisco IOS XE Release 3 RTR Security Technical Implementation Guide

Associated with: CCI-002403

SV-88807r1_rule The Cisco ISR 4000 Series router must have IP source routing disabled.

Vulnerability discussion

Source routing is a feature of IP, whereby individual packets can specify routes. This feature is used in several different network attacks by bypassing perimeter and internal defense mechanisms.

Check content

Review the configuration of the Cisco ISR 4000 Series router to determine if source routing is enabled. If "ip source-routing" is in the configuration then it is enabled, this is a finding.

Fix text

Configure the Cisco ISR 4000 Series router to disable IP source routing, using the command below: ISR4000(config)#no ip source-route

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