Re: HEADS UP: rpc.yppasswdd working again

2003-06-15 Thread Mark Murray
Martin Blapp writes:
>  maps using ypchpass(1).  Again, this only applies to the super-user on
>  the NIS master server: none of these special functions can be performed
>  over the network.

I am happy!

M
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Mark Murray
iumop ap!sdn w,I idlaH
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Re: HEADS UP: rpc.yppasswdd working again

2003-06-15 Thread Martin Blapp

> he can change passwords on the server at will.

>From the rpc.yppasswdd manpage:

 The FreeBSD version of rpc.yppasswdd also allows the super-user on the
 NIS master server to perform more sophisticated updates on the NIS passwd
 maps.  The super-user can modify any field in any user's master.passwd
 entry in any domain, and can do so without knowing the user's existing
 NIS password (when the server receives a request from the super-user, the
 password authentication check is bypassed). Furthermore, if the server is
 invoked with the -a flag, the super-user can even add new entries to the
 maps using ypchpass(1).  Again, this only applies to the super-user on
 the NIS master server: none of these special functions can be performed
 over the network.

 The rpc.yppasswdd utility can only be run on a machine that is an NIS
 master server.
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Re: HEADS UP: rpc.yppasswdd working again

2003-06-15 Thread Martin Blapp

hi,

> > All users who had problems with NIS should rebuild their
> > world. Long outstanding problems have been fixed and
> > rpc.yppasswdd allows root again to change passwords
> > on ypmaster without knowledge of the users password.

   

> Does this not create a vulnerability?
>
> Example: Bad Guy sets up a personal workstation with himself as root
> and steals an IP address from the machine he just switched off. Now
> he can change passwords on the server at will.

It is only possible on the ypmaster server. And if you are root
you can edit the password files directly, can't you :-) ?

Martin
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Re: HEADS UP: rpc.yppasswdd working again

2003-06-15 Thread Mark Murray
Martin Blapp writes:
> 
> Small, but important message for NIS users.
> 
> All users who had problems with NIS should rebuild their
> world. Long outstanding problems have been fixed and
> rpc.yppasswdd allows root again to change passwords
> on ypmaster without knowledge of the users password.

Does this not create a vulnerability?

Example: Bad Guy sets up a personal workstation with himself as root
and steals an IP address from the machine he just switched off. Now
he can change passwords on the server at will.

M
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Mark Murray
iumop ap!sdn w,I idlaH
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HEADS UP: rpc.yppasswdd working again

2003-06-15 Thread Martin Blapp

Small, but important message for NIS users.

All users who had problems with NIS should rebuild their
world. Long outstanding problems have been fixed and
rpc.yppasswdd allows root again to change passwords
on ypmaster without knowledge of the users password.

Martin
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