So I have been looking at ways to improve Fierce for a few weeks. I spoke with Rsnake and he said the one thing that Fierce does which could be improved, is once it performs a Zone Transfer it quits rather then continue onto a Brute Force DNS attack. Therefore, I decided to talk with a few guys at work and we concluded that this was not the proper thing for it today. What it *should* do is to provide the user with the option to stop once a Zone Transfer has been perform, however it should default to continuing onto the Brute Force DNS attack. I recently, updated the patch:

http://spl0it.org/files/patches/fierce- ... stop.patch

To apply this patch:

wget http://ha.ckers.org/fierce/fierce.pl
wget http://spl0it.org/files/patches/fierce- ... stop.patch
patch -p0 < fierce-zonetransfer-stop.patch
chmod +x fierce.pl
./fierce.pl -h

The option that is added in this patch is the --stop option which quits Fierce if a Zone Transfer is successful.