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Re: [NSE] Several changes to mssql.lua and SQL Server scripts
From: Chris Woodbury <woodbusy () gmail com>
Date: Fri, 25 Feb 2011 16:31:55 -0600

On Fri, Feb 25, 2011 at 1:53 PM, Patrik Karlsson <patrik () cqure net> wrote:


On Feb 25, 2011, at 00:15 , Chris Woodbury wrote:
Based on all of that, I have a few comments:
* Now that we have instance-name and instance-port, I'm not sure that
it's intuitive that the way to hit all instances is by specifying
instance-name=all, especially considering the case where there are instances
we don't know the names of. How about having a script argument like
mssql.all-instances?
I've added a instance-all argument to align better with the other names.
Does that make sense?


Good idea.


* I really like the idea that it's now possible to use SQL Server as a
proxy for doing Windows password testing. However, I think we should put up
some hurdles for the user. Virtually all the Windows networks I've worked
with have had account lockout policies in place, and I'm concerned that
someone could accidentally end up brute-forcing a domain and locking out a
bunch of accounts. I think we ought to add a script argument to enable it.
At first, I didn't understand the problem here, as you previously wrote
that you modified the script to abort once it detected a lockout.
When I tested it I noticed what happened, and that there's no way of
detecting that an account has been locked out based on the error message
returned by the server.
I agree that there's a risk of locking out a number of accounts,
potentially the whole domain, if you run the script without knowing what
your doing or how it works.
Either we document this with a few exclamation marks, or we simply fail to
start the script (if Windows authentication is used) and return an
explanation why and instructions how to proceed.
We could use an argument that tells the script how many attempts to perform
for each account, if unset and the authentication method is set to Windows,
the script won't start.
How about that?


Actually, since you mention it, it might be nice to have an "only do this
many attempts" argument for SQL Server authentication as well, since those
can also have lockouts. But maybe that's just something the user should
control with the password database (incidentally, the brute script now tries
the username as the password - should that be configurable?).
Anyway, I'd be fine with doing something like that for Windows at least, or
maybe just a ms-sql-brute.brute-windows-accounts argument, so that it's
explicit. I think either would be fine, as long as it's an extra step that
is required and is only applicable for Windows authentication.


Let me know what you think about all of that. In the meantime, I'm going
to do some documentation.
Great!


I took a shot at this in the attached patch; let me know what you think.
There's also a small bugfix in there in mssql.lua, where I changed a "host"
to "instance.host", which fixed a bug for broadcast-ms-sql-discover.nse



-chris
On Sat, Feb 19, 2011 at 2:42 AM, Patrik Karlsson <patrik () cqure net>
wrote:

//Patrik

--
Patrik Karlsson
http://www.cqure.net
http://www.twitter.com/nevdull77

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