NT 4.0 Stupid default SMB mount permissions
| Description: | If you have an account on a NT box, you are by default allowed to mount any drive r/w by mounting \\server\c$ (replace 'c' with the drive letter). |
| Author: | Well known, but this post was by Yiorgos Adamopoulos <Y.Adamopoulos@noc.ntua.gr> |
| Compromise: | Mount any NT drive r/w (local) |
| Vulnerable Systems: | NT 4.0 with no service packs, 3.51? |
| Date: | 7 April 1997 |
Exploit:
> It is known about big hole in NT 4.0 security system
> that allows for a user without any access permission to mount NT
> server root directory (disk C:) in r/w mode and to take a
> complete control over NT system ? I heard only some little
Under 4.0 (no service packs) it is possble to mount drive C: (and any other
drive) R/W if you have a user account. Note that this is the default
installation and therefore it is not a bug but a missconfiguration:
smbclient '\\ntserver\c$' -U user
should give you the smb> prompt.
Installing SP2 removes these defaults.
-Yiorgos.
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