The system must not send IPv4 ICMP redirects.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22417	GEN003610	SV-26632r2_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 that could reveal portions of the network topology.

STIG	Date
SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2016-06-22

Details

Check Text ( C-27669r2_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 does not send IPv4 ICMP redirect messages. Procedure: # ndd /dev/ip ip_send_redirects If the result is not 0, this is a finding.

Check Text ( C-27669r2_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 does not send IPv4 ICMP redirect messages.

Procedure:
# ndd /dev/ip ip_send_redirects

If the result is not 0, this is a finding.

Fix Text (F-23875r1_fix)
Configure the system to not send IPv4 ICMP redirect messages. Procedure: # ndd -set /dev/ip ip_send_redirects 0 Also add this command to a system startup script.