Finding ID | Version | Rule ID | IA Controls | Severity |
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V-22410 | GEN003603 | SV-37608r1_rule | ECSC-1 | Medium |
Description |
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Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
STIG | Date |
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Red Hat Enterprise Linux 5 Security Technical Implementation Guide | 2016-06-01 |
Check Text ( C-36776r1_chk ) |
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Verify the system does not respond to ICMP ECHO_REQUESTs set to broadcast addresses. Procedure: # cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts If the result is not 1, this is a finding. |
Fix Text (F-31641r1_fix) |
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Configure the system to not respond to ICMP ECHO_REQUESTs sent to broadcast addresses. Edit /etc/sysctl.conf and add a setting for "net.ipv4.icmp_echo_ignore_broadcasts=1" and reload the sysctls. Procedure: # echo "net.ipv4.icmp_echo_ignore_broadcasts=1" >> /etc/sysctl.conf # sysctl -p |