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

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with: CCI-000366

SV-29785r2_rule The system must not respond to ICMPv6 echo requests sent to a broadcast address.

Vulnerability discussion

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

Check content

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

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.

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