SV-252955r958566: TOSS must reveal error messages only to authorized users. | Tri-Lab Operating System Stack (TOSS) 4 STIG SCAP Benchmark

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Assessment Title

Rule Text

TOSS must reveal error messages only to authorized users.

Description

Discussion Text

Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the operating system or platform. Additionally, Personally Identifiable Information (PII) and operational information must not be revealed through error messages to unauthorized personnel or their designated representatives. The structure and content of error messages must be carefully considered by the organization and development team. The extent to which the information system is able to identify and handle error conditions is guided by organizational policy and operational requirements.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001314

References

DPMS Target TOSS 4 DISA DPMS Target TOSS 4 5469

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.toss4os:def:252955
# TOSS must reveal error messages only to authorized users.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# file_object (file_test)
test_1() {
  ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,7,1)=="x" || substr($0,7,1)=="s")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,8,1)=="r")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,4,1)=="x" || substr($0,4,1)=="s")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,10,1)=="t" || substr($0,10,1)=="T")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,7,1)=="s" || substr($0,7,1)=="S")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,4,1)=="s" || substr($0,4,1)=="S")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,10,1)=="x" || substr($0,10,1)=="t")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,9,1)=="w")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log/messages' | awk '{print (substr($0,6,1)=="w")?"true":"false"}') | grep -qxF 'false' )
}
# file_object (file_test)
test_2() {
  [ "$(stat -c '%u' '/var/log/messages')" -eq 0 ]
}
# file_object (file_test)
test_3() {
  ( (stat -c '%A' '/var/log' | awk '{print (substr($0,10,1)=="t" || substr($0,10,1)=="T")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log' | awk '{print (substr($0,7,1)=="s" || substr($0,7,1)=="S")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log' | awk '{print (substr($0,4,1)=="s" || substr($0,4,1)=="S")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log' | awk '{print (substr($0,9,1)=="w")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/log' | awk '{print (substr($0,6,1)=="w")?"true":"false"}') | grep -qxF 'false' )
}
# file_object (file_test)
test_4() {
  [ "$(stat -c '%u' '/var/log')" -eq 0 ]
}

if ( test_1 && test_2 && test_3 && test_4 ); 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.toss4os:def:252955
if [ ! -f "/var/log/messages" ]; then echo "PASS"; exit 0; fi; if [ ! -r "/var/log/messages" ] || [ ! -w "/var/log/messages" ] || [ -w /var/log/messages ] || [ -x /var/log/messages ] || [ -s /var/log/messages ]; then echo "FAIL"; exit 1; fi; if [ $(stat -c %u /var/log/messages) -ne 0 ]; then echo "PASS"; exit 0; fi; if [ ! -d "/var/log" ]; then echo "PASS"; exit 0; fi; if [ ! -r "/var/log" ] || [ ! -w "/var/log" ] || [ -w /var/log ] || [ -x /var/log ] || [ -s /var/log ]; then echo "FAIL"; exit 1; fi; if [ $(stat -c %u /var/log) -ne 0 ]; then echo "PASS"; exit 0; fi; echo "PASS"; exit 0

Remediation

Change the permissions of the file "/var/log/messages" to "0640" and the ownership of the file to "root" by running the following commands:

$ sudo chmod 0640 /var/log/messages
$ sudo chown root /var/log/messages

Change the permissions of the directory "/var/log/" to "0755" and the ownership of the directory to "root" by running the following commands:

$ sudo chmod 0755 /var/log/
$ sudo chown root /var/log/