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Verizon Wireless site gives up customer data
From: InfoSec News <isn () c4i org>
Date: Fri, 7 Sep 2001 02:00:46 -0500 (CDT)


Verizon Wireless site gives up customer data
By Thomas C Greene in Washington
Posted: 05/09/2001 at 11:15 GMT

A poor scheme for logging in to the Verizon Wireless customer support
Web site using a simple session ID number makes it easy for a
malicious party to hijack another user's session and examine his
wireless phone records.

An example URL shows how simple it would be to manipulate the session


It's believed that the session ID's are assigned sequentially, so it
would be short work for someone to develop a little brute-force progie
to exploit them. Even guessing would probably work reasonably well for
someone with time on his hands, since the scheme is appallingly

The flaw was discovered and reported by software engineer Marc Slemko,
who contacted the company two weeks ago but heard nothing in reply. So
he posted the information to the BugTraq mailing list this past
weekend, hoping to get some action from Verizon techies.

The more public approach seems to have worked like a charm. The
company is now conducting an investigation into the validity and scope
of the problem, Verizon Executive Director of Corporate Communications
Brian Wood told us.

In the mean time, until the hole is bunged, Slemko recommends that
customers not access the Web site.

"Cell phone bills....contain names, addresses, and a complete record
of calls placed and received, along with the approximate location the
user was when the call was made," Slemko observes in his BugTraq post.
"I'm sure I'm not alone in expecting my provider to provide a
reasonable level of privacy for this data."

The contact buffer

We've been wondering why Verizon needed prodding into action on such
an important matter. Apparently, poor internal communications is to
blame. As of Tuesday, the company was unable to locate Slemko's memo
or any record of his original contact.

"I did not even bother phoning, since trying to explain a problem of a
technical nature over the phone to first and second and third etc.
tier customer service reps is just a pointless waste of time that I
don't have to spare," Slemko told us.

"I wouldn't doubt that it didn't make its way to the right people.
Verizon is more forceful than most companies in making it very
difficult to get in touch with anyone useful. I submitted a detailed
description -- along with a note-to-incompetents that if they don't
understand what I'm talking about, they had better escalate it -- by
using their on-line 'contact us' procedures."

So it would appear that his memo went directly into the great
customer-service slush pile, and languished.

We have to agree with Slemko's characterization of contacting Verizon
beyond the customer-service-drone level. We experienced a similar
problem in researching this story, which (having a wide experience
with this sort of thing) we quickly solved by grabbing a company press
release off one of the wire services and approaching a contact named
in it.

Alternatively, we could have done an Edgar search and got the
corporate switchboard number. But the Verizon Wireless Web site
offered nothing but a mass-email account, and a toll-free
customer-service number, neither of which would have accommodated our
level of patience.

We realize that this sort of access buffering is meant to insulate
busy executives from repeated, meaningless contacts with the
self-interested and the deranged, but in this case its inherent
downside has been nicely illustrated.

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