SV-204627r991589: SNMP community strings on the Red Hat Enterprise Linux operating system must be changed from the default. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

SNMP community strings on the Red Hat Enterprise Linux operating system must be changed from the default.

Description

Discussion Text

Whether active or not, default Simple Network Management Protocol (SNMP) community strings must be changed to maintain security. If the service is running with the default authenticators, anyone can gather data about the system and the network and use the information to potentially compromise the integrity of the system or network(s). It is highly recommended that SNMP version 3 user authentication and message encryption be used in place of the version 2 community strings.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366SV-86937V-72313

References

DPMS Target Red Hat Enterprise Linux 7 DISA DPMS Target Red Hat Enterprise Linux 7 2899

Checks

DISA STIG (Manual Reference)

Verify that a system using SNMP is not using default community strings.

Check to see if the "/etc/snmp/snmpd.conf" file exists with the following command:

# ls -al /etc/snmp/snmpd.conf
 -rw-------   1 root root      52640 Mar 12 11:08 snmpd.conf

If the file does not exist, this is Not Applicable.

If the file does exist, check for the default community strings with the following commands:

# grep public /etc/snmp/snmpd.conf
# grep private /etc/snmp/snmpd.conf

If either of these commands returns any output, this is a finding.

SCC Automation Reference

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:1369
# SNMP community strings on the Red Hat Enterprise Linux operating system must be changed from the default.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# package net-snmp is removed
# rpminfo_object (rpminfo_test)
test_1() {
  ! ( rpm -q --quiet 'net-snmp' &>/dev/null )
}
# SNMP communities
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ! ( grep -Pq '^[\s]*(com2se|rocommunity|rwcommunity|createUser|authcommunity)[^#]*(public|private)' '/etc/snmp/snmpd.conf' &>/dev/null )
}

if ( test_1 || test_2 ); then
  echo "PASS"
else
  echo "FAIL"
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 definition: oval:mil.disa.stig.rhel7:def:1369


if ! command -v rpm &> /dev/null; then
  echo "FAIL"
  exit 1
fi

if rpm -qa | grep -q 'net-snmp'; then
  echo "PASS"
  exit 0
fi

if ! [ -f "/etc/snmp/snmpd.conf" ]; then
  echo "PASS"
  exit 0
fi

if grep -E "^[\s]*(com2se|rocommunity|rwcommunity|createUser|authcommunity)[^#]*(public|private)" /etc/snmp/snmpd.conf &> /dev/null; then
  echo "FAIL"
  exit 1
fi

echo "PASS"
exit 0

Remediation

If the "/etc/snmp/snmpd.conf" file exists, modify any lines that contain a community string value of "public" or "private" to another string value.