The system must ignore IPv6 ICMP redirect messages.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22550	GEN007860	SV-26937r1_rule	ECSC-1	Medium

Description
ICMP redirect messages are used by routers to inform hosts that 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
SOLARIS 9 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2015-10-01

Details

Check Text ( C-27885r1_chk )
Verify the system is configured to ignore IPv6 ICMP redirect messages. # ndd /dev/ip6 ip6_ignore_redirect If the returned value is not 1, this is a finding.

Fix Text (F-24182r2_fix)
Configure the system to ignore IPv6 ICMP redirect messages. # ndd -set /dev/ip6 ip6_ignore_redirect 1 Also add this command to a system startup script.