[future patch] dropping user privileges on demand

[Pawel Jakub Dawidek]

On Thu, Aug 21, 2003 at 12:39:00AM -0700, Kris Kennaway wrote:
+> > It does something similar, but uses a C-like language to control a
+> > processes actions.  This lets you get extremely fine-grained control
+> > (allow httpd to bind to only port 80, once), but the rules run as
+> > "root", so they can grant as well as revoke privileges.  A useful
+> > modification would be to allow users to submit their own policies that
+> > can only disallow actions (i.e. all arguments and process variables are
+> > read-only, and the script can either pass the syscall through or return
+> > a failure code, nothing else).
+> 
+> Exercise for the reader: find a situation where the failure to perform
+> a syscall that normally succeeds, leads to privilege escalation :-)

The answer is: Every network daemon. If you could compromise it,
you get local access.

-- 
Pawel Jakub Dawidek                       pawel at dawidek.net
UNIX Systems Programmer/Administrator     http://garage.freebsd.pl
Am I Evil? Yes, I Am!                     http://cerber.sourceforge.net
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