UCF STIG Viewer Logo

The system must ignore IPv4 ICMP redirect messages.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22416 GEN003609 SV-38801r1_rule ECSC-1 Medium
Description
ICMP redirect messages are used by routers to inform hosts a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.
STIG Date
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE 2018-09-18

Details

Check Text ( C-37257r1_chk )
# /usr/sbin/no -o ipignoreredirects
If the value returned is not 1, this is a finding.
Fix Text (F-32498r1_fix)
Configure the system to ignore IPv4 ICMP redirect messages.
#/usr/sbin/no -p -o ipignoreredirects=1