Messages in this thread |  | | Date | Tue, 25 Nov 2003 13:12:20 GMT | From | John Bradford <> | Subject | Re: hard links create local DoS vulnerability and security problems |
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Quote from mru@kth.se (=?iso-8859-1?q?M=E5ns_Rullg=E5rd?=): > John Bradford <john@grabjohn.com> writes: > > >> > They can truncate the file to zero length, though, then delete the > >> > 'original' link, making all of the other links point to the zero > >> > length file. > >>=20 > >> It could be tricky to find those extra links if the original has bee= > n > >> deleted, of course. > > > > True, but as long as at least one of the links which has been made to > > the original file is in a directory you have access to, you can simpl= > y > > create a new link to the file, truncate it, then delete your newly > > created link, so actually deleting the 'original' link is not > > necessarily a problem :-). > > There's no need to make a new link, since any links will be owned by > the original owner. That was the concern in the first place. The > problem is finding a link after the file has been deleted. It could > be hidden away somewhere in a directory you don't have read or execute > permission for.
Ah, OK, I was thinking of something else entirely :-)
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