SV-38768r1: Users must not be able to change passwords more than once every 24 hours. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

Users must not be able to change passwords more than once every 24 hours.

Description

Discussion Text

The ability to change passwords frequently facilitates users reusing the same password. This can result in users effectively never changing their passwords. This would be accomplished by users changing their passwords when required and then immediately changing it to the original value.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000198

Additional Details

Responsibility

System Administrator

IA Controls

ECSC-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:37
# Users must not be able to change passwords more than once every 24 hours.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# all instances of minage are OK
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  [ "$(sed -En 's/^[ 	]*minage[ 	]*=[ 	]*([0-9]+)/\1/p' '/etc/security/user')" -ge 1 ]
}
# default specifies minage
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  (sed -En 's/^([^: 	
]+):
([^:
]+=[^
]*
)*[ 	]*minage = [0-9]+/\1/p' '/etc/security/user') | grep -qxF 'default'
}
# all users specify minage
# password_object (password_test)
test_3() {
  ! ( getent passwd .* &>/dev/null )
}

if ( test_1 && ( test_2 || test_3 ) ); 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:mil.disa.fso.aix11:def:37 compliance check


if grep -qE '^[ \t]*minage[ \t]*=[ \t]*[0-9]+' /etc/security/user && grep -oP '^[ \t]*minage[ \t]*=[ \t]*([0-9]+)' /etc/security/user | grep -qE '^[ \t]*1[ \t]*$' ; then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Use SMIT or the chsec command to set the minimum password age to 1 week.

# chsec -f /etc/security/user -s default -a minage=1 
# chsec -f /etc/security/user -s <user id> -a minage=1

OR

# smitty chuser