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UGU: Unix Guru Universe - Unix Tip #4572- September 17, 2025
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Unix Tip #4572- September 17, 2025
MONITORING ROOT IN THE PASSWORD FILE
One of the popularly known method of breaking into a Unix host
is by inserting a uid value 0 in the /etc/passwd file which could
be done in many ways including backdoors for later accesses .
The script below displays warning messages on the console if
such changes a detacted. Simply place the script in the crontab
and run as frequent as you wish.
------------------------------CUT HERE-----------------------------------------
for id in `awk 'FS=":" {if(($3 == 0 && $1 != "root" )) print $1}' /etc/passwd`
do
cat << the_end >/dev/console
+----------------------------------------------------------------
|
| `date "+Detacted On Date :%D Time :%r"`
| Break-in ALERT! Login ID `echo ${id}` has uid 0
|
+----------------------------------------------------------------
the_end
done
------------------------------CUT HERE-----------------------------------------
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4571
- CREATE YOUR OWN GROUP ALIASES
4570
- KILL X
4569
- ALTERNATIVE TO CP
4568
- -------- REMOVE THE DASHES
4567
- SEPARATE SHELL COMMAND HISTORY FILES
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