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.ubuntu1604:def:251
# The Ubuntu 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 sysctl configuration files is set to 1, and nothing else: <set> composition (base object oval:mil.disa.stig.ubuntu1604:obj:25101, oval:mil.disa.stig.ubuntu1604:obj:25102): member unresolved -- no extractor for field "subexpression"
# net.ipv4.icmp_echo_ignore_broadcasts setting in kernel to 1
# sysctl_object (sysctl_test)
test_1() {
[ "$(cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts)" -eq 1 ]
}
if test_1; 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.ubuntu1604:def:251
if [ ! -x /sbin/sysctl ]; then echo "FAIL"; exit 1; fi
if [ $(sysctl -n net.ipv4.icmp_echo_ignore_broadcasts 2>/dev/null) -ne 1 ]; then echo "FAIL"; exit 1; fi
if [ ! -f /etc/sysctl.conf ]; then echo "PASS"; exit 0; fi
if ! grep -qE '^\s*net\.ipv4\.icmp_echo_ignore_broadcasts\s*=\s*1\s*$' /etc/sysctl.conf; then echo "FAIL"; exit 1; fi
if [ -d /etc/sysctl.d ]; then
for file in /etc/sysctl.d/*; do
if [ -f "$file" ]; then
if ! grep -qE '^\s*net\.ipv4\.icmp_echo_ignore_broadcasts\s*=\s*1\s*$' "$file"; then echo "FAIL"; exit 1; fi
fi
done
fi
echo "PASS"; exit 0