Unfortunately lpd exploits have plagued the Unix world for decades. They come in a variety of delivery methods and have targeted specific versions and implemenations over the years. I believe Red Hat had the nastiest one a couple of years ago.

My particular issue with Solaris has always been that they are about as slow as MS in fixing/patching such problems. Don't get me wrong, Solaris is an outstanding OS. I choose to use Linux and FreeBSD though because being a security concious guy, the mainatainers and 3rd party solution providers are more on top of the issues as they happen. Less than two hours for the patch to the Linux kernel that prevented the receipt of a `ping of death' attack (packet greater than 65536 bytes).