Title

AIX must automatically lock after 15 minutes of inactivity in the CDE Graphical desktop environment. (Cat II impact)

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

Additional Identifiers

Rule ID: SV-215318r958402_rule

Vulnerability ID: V-215318

Group Title: SRG-OS-000029-GPOS-00010

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.