Re: [PEN-TEST] Oracle USER$ password hashes

[Stefan Aeschbacher <stefan () AESCHBACHER COM>]

Hi
to find out what cipher is used, some more information would help.
Unfortunately I have no access to an Oracle System. (and I'm not
really a criptanalyst, but we could give it a try anyway ;)
So the following would be needed:

- is there really a salt (just install two users with the same PW)
- some more plain-text/ciphertext pairs. maybe some special
  sequences (e.g. aaaaaaaa, a) would also help.

With this data some more research could be done.
The other method would be the disassembling of the cryptocode in the
Oracle program (which I'm not really eager to do).

Stefan


Olle Segerdahl wrote:
> On Thu, Nov 09, 2000 at 03:33:03PM +0100, Nicolas Gregoire wrote:
>
> > > Since the hashes are always the same for the same password, it most
> > > definately isn't salted....
> > > ...
> > > change_on_install       = D4C5016086B2DC6A
> > > manager                 = D4DF7931AB130E37
> >
> > Are the first 2 characters always "D4" ?
> >
> > It could the fixed salt, ie. $crypted  = unkown-crypt("D4", $clear);
>
> Hmm.. I think you might be right, actually...
>
> The two passwords above are default on install, so the salt (and hash) is
> probably the same for all installations, just checked another db and the
> regular users passwords DO appear to be salted.... My mistake...
>
> Ok, so ammendments to first post statements:
>
> Passwords are NOT case sensitive and there is probably one byte salt.
> Passwords are not limited to 7 or 8 chars, either....
>
> Anyone have a clue as to what it might be?
>
> /olle