Re: C$ Default Share Security Issue

[Ansgar Wiechers <bugtraq () planetcobalt net>]

On 2011-07-18 ??????? ?????? wrote:
> Wouldn't it be even better than watching just closing the share with a
> script?! You could include it in a distribution of your own
> To delete the share (net share C$ /del) and that's it.

Only that C$ is an administrative share that is automatically re-shared
every time the server service (re-)starts. To disable administrative
shares you have to set the DWORD value AutoShareWks in the registry key
[HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters] to 0.

However, I strongly recommend against disabling administrative shares,
because that way you'd seriously cripple your own ability to remotely
manage the client. Besides, they're only accessible by administrators
anyway.

As for monitoring access to administrative shares: that's what SACLs are
for.

<http://technet.microsoft.com/en-us/library/cc961813.aspx>

> On a windows vista or 7 environment it would be awkward to disable UAC
> to Let the script go ('cause it won't run even with the runas command)
> because of other implications e.g. other users would be able To
> install programs but in a domain controlled space it wouldn't be a
> problem either way.

On Windows 7 you should disable UAC, because if you're practicing LUA
(which you should) it will only gain you a lot hassle, but no additional
security at all.

Regards
Ansgar Wiechers
-- 
"All vulnerabilities deserve a public fear period prior to patches
becoming available."
--Jason Coombs on Bugtraq

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