The system must ignore IPv6 ICMP redirect messages.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22550	GEN007860	SV-26937r2_rule		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 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-04-10

Details

Check Text ( C-27885r2_chk )
Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces 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.

Check Text ( C-27885r2_chk )

Determine the type of zone that you are currently securing.
# zonename

If the zone is not the global zone, determine if any interfaces are exclusive to the zone:
# dladm show-link

If the output indicates "insufficient privileges" then this requirement is not applicable.

If the zone is the global zone or the non-global zone has exclusive interfaces 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.