The system must not respond to ICMPv6 echo requests sent to a broadcast address.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-23972	GEN007950	SV-29785r2_rule		Medium

Description
Responding to broadcast ICMP echo requests facilitates network mapping and provides a vector for amplification attacks.

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

Details

Check Text ( C-30065r2_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 determine if the system is configured to ignore IPv6 multicast ICMP echo-requests. Procedure: # ndd -get /dev/ip ip6_respond_to_echo_multicast If the result is not 0, this is a finding.

Check Text ( C-30065r2_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 determine if the system is configured to ignore IPv6 multicast ICMP echo-requests.

Procedure:
# ndd -get /dev/ip ip6_respond_to_echo_multicast

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

Fix Text (F-26896r1_fix)
Configure the system to not respond to IPv6 multicast ICMP echo-requests. Procedure: # ndd -set /dev/ip ip6_respond_to_echo_multicast 0 This command must also be added to a system startup script.