1 Suid-Writeable Root Owned File...Easy Compromise?

[Barry Russell <bjz11600 () PRODIGY NET>]

While messing around with a big web hosting company Sun OS system I came
across one(well actually two but too much messing around got that file
deleted) and the file was owned root, suid and writeable by all.

$ ls -la xu_chown
-rwsrwxrwx   1 root     root        xxxxxx Oct ?? ??:?? xu_chown
(variables changed to protect the innocent)

The file is a binary file, so after a little more messing around and
talking with a few people I was able to construct a perl script that
carries the source of one binary to that file so that the permissions
would stay the same. Well I did a little bit of playing around with no
way of taking 'advantage' of this file. I was wondering since its
root/suid/writeable was there anyway to exploit this ? This file might
also be the same way on other Sun systems but I have yet to check and
see.

Barry Russell