The system must not send IPv6 ICMP redirects.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22551	GEN007880	SV-26938r2_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 contain information from the system's route table revealing portions of the network topology.

STIG	Date
SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-04-10

Details

Check Text ( C-27886r2_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 not send IPv6 ICMP redirect messages. # ndd /dev/ip6 ip6_send_redirects If the returned value is not 0, this is a finding.

Check Text ( C-27886r2_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 not send IPv6 ICMP redirect messages.
# ndd /dev/ip6 ip6_send_redirects

If the returned value is not 0, this is a finding.

Fix Text (F-24183r1_fix)
Configure the system to not send IPv6 ICMP redirect messages. # ndd -set /dev/ip6 ip6_send_redirects 0 Also, add this command to a system startup script.