STIGhubSTIGhub
STIGsRMF ControlsCompare

STIGhub

A free tool to search and browse the entire DISA STIG library. Saves up to 75% in security compliance research time.

Navigation

  • Browse STIGs
  • Search
  • RMF Controls
  • Compare Versions

Resources

  • About
  • Release Notes
  • VPAT
  • DISA STIG Library
STIGs updated 1 hour ago
Powered by Pylon
© 2026 Beacon Cloud Solutions, Inc. All rights reserved.
← Back to IBM AIX 7.x Security Technical Implementation Guide

V-215318

CAT II (Medium)

AIX must automatically lock after 15 minutes of inactivity in the CDE Graphical desktop environment.

Rule ID

SV-215318r958402_rule

STIG

IBM AIX 7.x Security Technical Implementation Guide

Version

V3R2

CCIs

CCI-000057

Discussion

A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

Check Content

If CDE (X11) is not used on AIX, this is Not Applicable.

From the command prompt, run the following script:
for file in /usr/dt/config/*/sys.resources; do
  etc_file=`echo $file | sed -e s/usr/etc/`
  echo "\nChecking config file "$etc_file"..."
  if [[ ! -f $etc_file ]]; then
    echo "Missing config file "$etc_file
  else
    cat $etc_file |grep 'dtsession\*saverTimeout:'
    cat $etc_file |grep 'dtsession\*lockTimeout:'
  fi
done

The above script should yield the following output:
Checking config file /etc/dt/config/C/sys.resources...
Missing config file /etc/dt/config/C/sys.resources

Checking config file /etc/dt/config/POSIX/sys.resources...
dtsession*saverTimeout: 15
dtsession*lockTimeout: 30

Checking config file /etc/dt/config/en_US/sys.resources...
dtsession*saverTimeout: 15
dtsession*lockTimeout: 25

If the result of the script shows any config file missing, or any of the "dtsession*saverTimeout" or "dtsession*lockTimeout" values are greater than "15", this is a finding.

Fix Text

From the command prompt, run the following script to set the default timeout parameters "dtsession*saverTimeout:" and "dtsession*lockTimeout:" as "15" minutes: 
for file in /usr/dt/config/*/sys.resources; do
  etc_file=`echo $file | sed -e s/usr/etc/`
  echo "\nupdating config file "$etc_file"..."
  if [[ ! -f $etc_file ]]; then
    dir=`dirname $file | sed -e s/usr/etc/`
    mkdir -p $dir
    echo 'dtsession*saverTimeout: 15' >> $dir/sys.resources
    echo 'dtsession*lockTimeout: 15' >> $dir/sys.resources
  else
    cp $etc_file $etc_file.bak
    cat $etc_file | grep -v 'dtsession\*saverTimeout:' > $etc_file.sav
    cat $etc_file.sav | grep -v 'dtsession\*lockTimeout:' > $etc_file
    echo 'dtsession*saverTimeout: 15' >> $etc_file
    echo 'dtsession*lockTimeout: 15' >> $etc_file
  fi
done