Is it possible to reset the root password of an AIX without knowing the current password, using BigFix fixlet or tasks?
Short answer is YES.
The BESClient installs and runs as root on Linux and Unix endpoints. So you can execute the chpasswd or similar AIX command via Action Script or Bash scripting.
For inspiration, please see the change local user account password fixlet on BigFix.me.
you can use “expect” to change pwd in any unix OS. “chpasswd” may not present in the aix.
send “passwd root\r”;
expect 'Enter new password:'
expect 'Re-type new password:'