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Subject Author Date
admin shares and security Antti 02-27-2006
Posted by Antti on February 27, 2006, 10:30 am
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Hi.

I used to think that admin shares shouldn't be a threat if the administrator
password is secure. But, is there a way to audit or log tries to connect to
these shares? I have restricted guessing of passwords to five, but this
doesn't apply to connecting to shares. Doesn't this mean, that anyone can
use their spare time guessing the password (and account name) without a
trace?

What W2k3 functionality depends on admin shares, if any?

Antti



Posted by Roger Abell [MVP] on February 28, 2006, 8:30 am
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Some remote management tools use the admin shares.
If you are auditing login attempts you should be seeing logon
events of type 3 being recorded, success or failure, for the
network login attempts.

> Hi.
>
> I used to think that admin shares shouldn't be a threat if the
> administrator
> password is secure. But, is there a way to audit or log tries to connect
> to
> these shares? I have restricted guessing of passwords to five, but this
> doesn't apply to connecting to shares. Doesn't this mean, that anyone can
> use their spare time guessing the password (and account name) without a
> trace?
>
> What W2k3 functionality depends on admin shares, if any?
>
> Antti
>
>



Posted by Steven L Umbach on February 28, 2006, 9:10 pm
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If the lockout policy is configured on the computer that has the share or if
the computer is a domain computer and the domain policy has lockout enabled
then it should also apply to network logons. If you enforce strong passwords
then you can rethink using account lockout which can lead to denial of
service attack against uses. FYI if some user gains administrator access
then having administrator shares will be among the least of your
orries. --- Steve


> Hi.
>
> I used to think that admin shares shouldn't be a threat if the
> administrator
> password is secure. But, is there a way to audit or log tries to connect
> to
> these shares? I have restricted guessing of passwords to five, but this
> doesn't apply to connecting to shares. Doesn't this mean, that anyone can
> use their spare time guessing the password (and account name) without a
> trace?
>
> What W2k3 functionality depends on admin shares, if any?
>
> Antti
>
>



Posted by Antti on March 2, 2006, 7:26 am
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> Some remote management tools use the admin shares.
> If you are auditing login attempts you should be seeing logon
> events of type 3 being recorded, success or failure, for the
> network login attempts.

> If the lockout policy is configured on the computer that has the share or
> if the computer is a domain computer and the domain policy has lockout
> enabled then it should also apply to network logons. If you enforce strong
> passwords then you can rethink using account lockout which can lead to
> denial of service attack against uses. FYI if some user gains
> administrator access then having administrator shares will be among the
> least of your orries. --- Steve


You are both right. I tried to connect (with wrong password) to an admin
share of a server I was already connected to with another username. I guess
for this reason it didn't succeed and there was absolutely nothing in
security log. I tested another server's shares - and yes - I was able to
lock out the (server's local) admin account and events were logged. Thanks.

Antti



Posted by Roger Abell [MVP] on March 2, 2006, 8:26 pm
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>> Some remote management tools use the admin shares.
>> If you are auditing login attempts you should be seeing logon
>> events of type 3 being recorded, success or failure, for the
>> network login attempts.
>
>> If the lockout policy is configured on the computer that has the share or
>> if the computer is a domain computer and the domain policy has lockout
>> enabled then it should also apply to network logons. If you enforce
>> strong passwords then you can rethink using account lockout which can
>> lead to denial of service attack against uses. FYI if some user gains
>> administrator access then having administrator shares will be among the
>> least of your orries. --- Steve
>
>
> You are both right. I tried to connect (with wrong password) to an admin
> share of a server I was already connected to with another username. I
> guess for this reason it didn't succeed and there was absolutely nothing
> in security log. I tested another server's shares - and yes - I was able
> to lock out the (server's local) admin account and events were logged.
> Thanks.
>
> Antti
>
>
Makes sense.
If you start a new session to a server to which the login is
already connected the new session will use the existing
connection (and its credentials). Hence no failure.
If you attempt explicit mapping with use of different set
of credentials you should get a pop up saying you are
already connected to server with different credentials.
As it does not speak with server, no failure logged there.




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