SV-39905r1: The ftpusers file must be group-owned by root, bin, or sys. | SOLARIS 9 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The ftpusers file must be group-owned by root, bin, or sys.

Description

Discussion Text

If the ftpusers file is not group-owned by root or a system group, an unauthorized user may modify the file to allow unauthorized accounts to use FTP.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225

Additional Details

Responsibility

System Administrator

IA Controls

ECLP-1

References

DPMS Target Solaris 9 Sparc DISA DPMS Target Solaris 9 Sparc 21

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.solaris11:def:288
# The ftpusers file must be group-owned by root, bin, or sys.
# 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/ftpd/ftpusers is root
# file_object (file_test)
test_1() {
  [ "$(stat -c '%g' '/etc/ftpd/ftpusers')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/ftpd/ftpusers is bin
# file_object (file_test)
test_3() {
  [ "$(stat -c '%g' '/etc/ftpd/ftpusers')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/ftpd/ftpusers is sys
# file_object (file_test)
test_5() {
  [ "$(stat -c '%g' '/etc/ftpd/ftpusers')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group system
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  grep -Pq '^system:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/ftpd/ftpusers is system
# file_object (file_test)
test_7() {
  [ "$(stat -c '%g' '/etc/ftpd/ftpusers')" = "$(sed -En 's/^system:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test group of /etc/vsftpd.ftpusers is root
# file_object (file_test)
test_8() {
  [ "$(stat -c '%g' '/etc/vsftpd.ftpusers')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_9() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/vsftpd.ftpusers is bin
# file_object (file_test)
test_10() {
  [ "$(stat -c '%g' '/etc/vsftpd.ftpusers')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_11() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/vsftpd.ftpusers is sys
# file_object (file_test)
test_12() {
  [ "$(stat -c '%g' '/etc/vsftpd.ftpusers')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group system
# textfilecontent54_object (textfilecontent54_test)
test_13() {
  grep -Pq '^system:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/vsftpd.ftpusers is system
# file_object (file_test)
test_14() {
  [ "$(stat -c '%g' '/etc/vsftpd.ftpusers')" = "$(sed -En 's/^system:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test group of /etc/vsftpd/ftpusers is root
# file_object (file_test)
test_15() {
  [ "$(stat -c '%g' '/etc/vsftpd/ftpusers')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_16() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/vsftpd/ftpusers is bin
# file_object (file_test)
test_17() {
  [ "$(stat -c '%g' '/etc/vsftpd/ftpusers')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_18() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/vsftpd/ftpusers is sys
# file_object (file_test)
test_19() {
  [ "$(stat -c '%g' '/etc/vsftpd/ftpusers')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group system
# textfilecontent54_object (textfilecontent54_test)
test_20() {
  grep -Pq '^system:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /etc/vsftpd/ftpusers is system
# file_object (file_test)
test_21() {
  [ "$(stat -c '%g' '/etc/vsftpd/ftpusers')" = "$(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 ) ) && ( test_8 || ( test_9 && test_10 ) || ( test_11 && test_12 ) || ( test_13 && test_14 ) ) && ( test_15 || ( test_16 && test_17 ) || ( test_18 && test_19 ) || ( test_20 && test_21 ) ) ); 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
# DISA STIG / SCAP compliance check: oval:mil.disa.fso.solaris11:def:288

if [ ! -f "/etc/ftpd/ftpusers" ]; then echo "PASS"; exit 0; fi
if [ "$(stat -c '%G' /etc/ftpd/ftpusers)" = "root" ]; then echo "PASS"; exit 0; fi
if [ "$(grep '^bin:[^:]*:' /etc/group | grep -o '[0-9]+' | head -n 1)" = "$(stat -c '%g' /etc/ftpd/ftpusers)" ]; then echo "PASS"; exit 0; fi
if [ "$(grep '^sys:[^:]*:' /etc/group | grep -o '[0-9]+' | head -n 1)" = "$(stat -c '%g' /etc/ftpd/ftpusers)" ]; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Change the group owner of the ftpusers file.

Procedure:
# chgrp root /etc/ftpusers