The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.
#!/bin/bash
# Reconstructed from oval:mil.disa.stig.rhel7:def:284
# The Red Hat Enterprise Linux operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
# - textfilecontent54_object (textfilecontent54_test) -- net.ipv4.icmp_echo_ignore_broadcasts setting in /etc/sysctl.conf, or any of the other sysctl.d directories, is set to 1, and nothing else, and there are no conflicting settings in other files: <set> composition (base object oval:mil.disa.stig.rhel7:obj:2279, oval:mil.disa.stig.rhel7:obj:20461301): member unresolved -- no extractor for field "subexpression"
# kernel runtime parameter net.ipv4.icmp_echo_ignore_broadcasts set to the appropriate value
# sysctl_object (sysctl_test)
test_2() {
[ "$(cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts)" -eq 1 ]
}
if test_2; then
echo "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
else
echo "FAIL (or see MANUAL REVIEW note above)"
fi Assessment Script Powered by AISandbox-executed
A standalone Shell script to assess this control automatically. Review before running it in your environment.
Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.
#!/bin/sh
# oval:mil.disa.stig.rhel7:def:284
if [ ! -f "/etc/sysctl.conf" ]; then echo "PASS"; exit 0; fi
if [ ! -s "/etc/sysctl.conf" ]; then echo "PASS"; exit 0; fi
grep -q "^\\s*net\\.ipv4\\.icmp_echo_ignore_broadcasts[\\s]*=[\\s]*1\\s*$" "/etc/sysctl.conf" || echo "FAIL"; exit 1
if [ ! -d "/etc/sysctl.d" ]; then echo "PASS"; exit 0; fi
for file in /etc/sysctl.d/*; do
if [ -f "$file" ]; then
grep -q "^\\s*net\\.ipv4\\.icmp_echo_ignore_broadcasts[\\s]*=[\\s]*1\\s*$" "$file" || echo "FAIL"; exit 1
fi
done
echo "PASS"; exit 0
sysctl -q -n net.ipv4.icmp_echo_ignore_broadcasts >/dev/null 2>&1 || echo "FAIL"; exit 1
echo "PASS"; exit 0