SV-38752r1: The /etc/ftpaccess.ctl file must be group-owned by bin, sys, or system. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The /etc/ftpaccess.ctl file must be group-owned by bin, sys, or system.

Description

Discussion Text

If the ftpaccess.ctl file is not group-owned by a system group, an unauthorized user may modify the file to allow unauthorized access to modify the file. Unauthorized modification could result in Denial of Service to authorized FTP users or permit unauthorized access to system information.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225Not mappedCCI-000366

Additional Details

Responsibility

System Administrator

IA Controls

ECLP-1

References

DPMS Target AIX 6.1 DISA DPMS Target AIX 6.1 2176

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.fso.aix11:def:18
# The /etc/ftpaccess.ctl file must be group-owned by bin, sys, or system.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Test group of /etc/ftpaccess.ctl is root
# file_object (file_test)
test_1() {
  [ "$(stat -c '%g' '/etc/ftpaccess.ctl')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/ftpaccess.ctl is bin
# file_object (file_test)
test_3() {
  [ "$(stat -c '%g' '/etc/ftpaccess.ctl')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/ftpaccess.ctl is sys
# file_object (file_test)
test_5() {
  [ "$(stat -c '%g' '/etc/ftpaccess.ctl')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group system
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  grep -Pq '^system:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/ftpaccess.ctl is system
# file_object (file_test)
test_7() {
  [ "$(stat -c '%g' '/etc/ftpaccess.ctl')" = "$(sed -En 's/^system:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}

if ( test_1 || ( test_2 && test_3 ) || ( test_4 && test_5 ) || ( test_6 && test_7 ) ); 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.fso.aix11:def:18
if [ ! -f "/etc/ftpaccess.ctl" ]; then echo "PASS"; exit 0; fi
if [ $(stat -c "%G" /etc/ftpaccess.ctl) = "bin" ] || [ $(stat -c "%G" /etc/ftpaccess.ctl) = "sys" ] || [ $(stat -c "%G" /etc/ftpaccess.ctl) = "system" ]; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Change the group owner of the /etc/ftpaccess.ctl file.

# chgrp system /etc/ftpaccess.ctl