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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-45993r1_rule | ECSC-1 | Medium |
| Description |
|---|
| Responding to broadcast ICMP echo requests facilitates network mapping and provides a vector for amplification attacks. |
| STIG | Date |
|---|---|
| SUSE Linux Enterprise Server v11 for System z | 2015-05-27 |
Details
| Check Text ( C-43275r1_chk ) |
|---|
| Check for an ip6tables rule that drops inbound IPv6 ICMP ECHO_REQUESTs sent to the all-hosts multicast address. Procedure: # less /etc/sysconfig/scripts/SuSEfirewall2-custom Check for a rule in, or referenced by, the INPUT chain such as: ip6tables -A INPUT -p icmpv6 -d ff02::1 --icmpv6-type 128 -j DROP If such a rule does not exist, this is a finding. |
| Fix Text (F-39358r1_fix) |
|---|
| Add an ip6tables rule that drops inbound IPv6 ICMP ECHO_REQUESTs sent to the all-hosts multicast address. Edit /etc/sysconfig/scripts/SuSEfirewall2-custom and add a rule in, or referenced by, the INPUT chain such as: ip6tables -A INPUT -p icmpv6 -d ff02::1 --icmpv6-type 128 -j DROP Reload the SuSEfirewall2 rules. Procedure: # rcSuSEfirewall2 restart |