RE: Leased Lines

["Shenk, Jerry A" <jshenk () decommunications com>]

Sure, you can tap into them.  The "banana plugs" on the smartjack are
one way to go.  You can also tap into the traffic from the pole outside
the building (or the network access box or whatever you have outside).
It's also possible to tap into that traffic from any point it passes
through like the phone company's buildings.

Now, the question really isn't "can it be done" 'cuz basically, it can
always be done;)  It's how hard is it to get the data and how valuable
is it.  If you're the DOD, maybe an unencrypted T1 isn't going to be the
best option because you have data that some people want and some of
those people (other countries) have large budgets.  If on the other
hand, you'd a church with barely the budget to get the T1 in the first
place and you don't have any PII (Personally Indentifiable Information)
and the only thing that goes across the T1 is the order of service for
Sunday morning (ok, ridiculous example) but I don't think you need the
encryption.  You're probably someplace in the middle;)

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of Sebastiaan
Sent: Monday, October 12, 2009 5:43 AM
To: pen-test () securityfocus com
Subject: Leased Lines

Hi,

I'm looking for any information related to the security of leased
lines, specifically if it is feasible to eavesdrop on them outside a
companies building. What would it take to do it?

I'm having  a debate about the use fullness of encryption on leased
lines and the use of strong authentication for the PPP session and
such.

I understand there are always risk assessment/costs aspects to
security issues, but I'm currently focused on the technical side of
things :)

Reg.

Seb

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