Root exploit for FreeBSD
pschmehl_lists at tx.rr.com
Fri Dec 11 05:47:08 UTC 2009
--On December 10, 2009 2:11:31 PM -0600 Kevin Wilcox
<kevin.wilcox at gmail.com> wrote:
> 2009/12/10 Anton Shterenlikht <mexas at bristol.ac.uk>:
>> I was just stressed after being forced by him
>> to explain why I wanted firewall exceptions
>> for two ports to my FreeBSD portscluster nodes.
>> I explained the reasons and that was settled.
> Anton, I don't know about the UK, Great Britain or England, but in US
> Universities, this is fairly common. It just serves as a sanity check
> for the many, many requests central IT tends to get regarding allowing
> ingress traffic for faculty/staff machines, and it gives the firewall
> guys documentation that such-and-such machine should be receiving
> inbound traffic on specific ports.
I can confirm this, at least for us. Our practice is to only open ports
for thoroughly justified business reasons, document thoroughly and audit
>> The Uni is, of course,
>> addicted to Microsoft, but having realised all
>> the problems with that, lately the policy has
>> been to deny (!) MS users admin access to their
>> own desktops. The situation is just ridiculous -
>> if a MS user wants to install a piece of software
>> on their PC he/she has to ask for permission,
>> and then wait until some computer officer would
>> come and do install for them.
> Again, I don't know about the UK, Great Britain or England, but in the
> US this is also quite common, at least with regards to University
> owned hardware. The first responsibility is to protect the network and
> existing services. Sadly, many groups fail to provide the next step,
> that being a relatively quick, easy way to have approved software
> installed for users, and a method for having non-approved software
> scrutinised and either approved or rejected.
This is less common at the universities that I'm familiar with. I think
it becomes less common the larger and/or older a university is. The trend
is to move in this direction, but we're also moving toward much stronger
compliance controls. There are things about your computer's configuration
and maintenance that you will no longer get to decide, regardless of the
OS you run - password strength and length, for example, the ability to
create local accounts, and other such things.
These things aren't being done to harass or irritate users but because of
long and bitter experience with a lack of controls. Our view is, if your
computer is going to connect on our network it must be configured in
certain ways and behave "normally" or you won't get a connection.
>> Also recently, well.. about a year ago, no
>> host (!) could be accessed from outside the
>> Uni firewall. Special exception has to be
>> obtained even for ssh. There is only one dedicated
>> sun server which accepts only ssh. The users
>> are supposed to dial to this frontend server
>> first, and from there to hosts on the local net.
> Again, quite common. Most Universities here do not provide
> public-facing IP addresses without some sort of application and
> approval process. For example, we have a handful of machines that are
> public facing but most of our hardware sits inside site-only networks.
> To access those machines you either have to be on-campus or you have
> to connect via VPN (and yes, we support Windows, Mac, Linux, Solaris,
This mirrors our practice. You don't get a public address without being
unannounced monitoring and immediate disconnection without prior notice if
a problem is detected.
> Having an SSH proxy isn't an entirely bad idea, though I can see where
> performance may be hindered.
>> I had to fight a long battle, well.. I had
>> some support from other academics, to have
>> a linux class in my Faculty. Here the
>> opposition wasn't so much security, as
>> "why would any undegraduate need linux",
>> as if MS solutions are a pinnacle of human thought.
> That's a pretty fair question and one that I hope you would have asked
> yourself before you made the push for the class.
>> And from I understand it's going to get worse.
>> Apparently the IT services are drawing up
>> plans to completely forbid use of "non-autorized"
>> OS. I imagine fbsd will not be authorized.
>> So I'm anticipating another battle already.
> Does this extend to computers used for academic research, student
> owned computers being used on campus, etc?
> Perhaps it's because we're conditioned to think this way but a lot of
> us at universities in the US see a lot of this as being commonplace
> and to *not* do them is generally considered bad security practice.
This last part is surprising to me. Not only are we not Windows-centric,
the very idea of not allowing a diversity of OSes is foreign to our
operation. We are a heavy Solaris shop (as are many universities), have a
good amount of Suse and RHEL and far less Windows servers exposed to the
Internet. At the desktop users may install whatever they want, so long as
it's maintained properly (which we audit routinely) and used in an
acceptable manner (which you agree to when you get an account.) We have
just about every OS you can imagine, including some you wouldn't believe
I'm starting to wonder if the security manager really said what Anton
claims he said, or Anton is filtering his perceptions through the anger he
feels at being restricted in his ability to operate freely. If the latter
is the case, you'd better adjust to it. It's the world of the future.
You can do whatever you want at home, but on the corporate network you
either follow the rules or lose your access.
Paul Schmehl, If it isn't already
obvious, my opinions are my own
and not those of my employer.
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