samba - Oct 2004 - Upgrading/Replacing Samba/Solaris 2.2.4 > ?

Due to Security audit items I'm having to patch/upgrade our SAMBA version
2.2.4 & 2.2.8a.
This needs to be as quick and effortless as possible. Can someone please
tell me if there
are patches available to fill security holes for these versions or is an
upgrade or total new
install required? If patches are available please tell me the url to
download from.
Thanks,
Pat E.