Bugzilla Bug 95378

The vulnerability is caused due to temporary file being created insecurely.
This can be exploited via symlink attacks to create and overwrite arbitrary files
with the privileges of the user running the affected script.

The exploitation require that the root try to update the software. 

##########
Versions:
##########

LutelWall <= 0.97

Vulnerable code :
-----------------

# Prefix of temporary firewall files
tmp='/tmp/lutelwall'

new_version_check () { # Check for new version of script

 if [ "`wget -V 2>&1 >/dev/null`" ]; then
  message 3 "Warrning: Wget is required to check for updates."
 else
  new_ver=`wget -C off -O - -q -t 1 -T 3 -w 3 -U "\`uname -a 2>&1\`"
http://firewall.lutel.pl/ver`
  if [ `echo $current_version | gawk '{ gsub("\\\.","") ; print 1$0 }'` -lt
`echo $new_ver | gawk '{ gsub("\\\.","") ; print 1$0 }'` ]; then
   echo -e "\nThere is newer version of LutelWall (${new_ver})"
   echo -n " Changes since previous version:"
   echo `wget -C off -O $tmp-newfeat -q -t 1 -T 3 -w 3
http://firewall.lutel.pl/FEATURES-${new_ver}`
   cat $tmp-newfeat
   echo "Do you want to update [y/N]? "
   read -s -t 5 -n 1 ln
   if [ "$ln" = 'y' -o "$ln" = 'Y' ]; then
    wget -O $tmp-script -q -T 3 http://firewall.lutel.pl/lutelwall
    cat $tmp-script > $0
    rm -rf $tmp-script
    echo "Your firewall is up to date, exiting after update!"
    exit
   else
    message 5 "Update aborted"
   fi
  else
    message 5 "LutelWall is up-to-date"
  fi;
 fi;

}

*** Bug 95596 has been marked as a duplicate of this bug. ***

Vanquirius: thx for the bump. 
Keywords are all set, this is ready for GLSA vote

I vote YES, I guess the update script is run by root.

agreed, there should be a GLSA

GLSA 200506-10