[IP] more on Yahoo IM "spoofing", "SPIM", and redirect
Begin forwarded message:
From: Travis Winfrey <winfreyt@xxxxxxxxx>
Date: February 21, 2006 6:35:47 PM EST
To: dave@xxxxxxxxxx
Subject: Re: [IP] Yahoo IM "spoofing", "SPIM", and redirect
Reply-To: Travis Winfrey <winfreyt@xxxxxxxxx>
I little out of date, but I ran this by my security person at work,
and he said:
Look at any e-mails you get from Yahoo – including emails sent to you
from Yahoo users. Look at the footer, and you’ll see some Yahoo
advertisement of some kind and a URL. The URL uses the redirector.
The redirector has no restrictions whatsoever. Typically when Yahoo
uses it, it redirects to another yahoo.com address.
I configured Postfix to look for these redirector addresses in e-mail
and reject mails if the redirected address is not itself a Yahoo
address.
Spammers have been using these redirectors since the day Yahoo (and
eBay) made them available. Why they don’t add restrictions, I can’t
imagine.
----- Original Message ----
From: David Farber <dave@xxxxxxxxxx>
To: ip@xxxxxxxxxxxxxx
Sent: Thursday, January 19, 2006 3:12:52 PM
Subject: [IP] Yahoo IM "spoofing", "SPIM", and redirect
Begin forwarded message:
From: Tracy Hall <tracy@xxxxxxxxxxxxxxxxxxxx>
Date: January 19, 2006 4:22:47 PM EST
To: dave@xxxxxxxxxx
Subject: Yahoo IM "spoofing", "SPIM", and redirect
You may have already seen something like this:
I just received an IM on Yahoo from a "ychat_violation_dept_yq4",
claiming
to be from Yahoo!, and claiming to have have received "...multiple
reports of abuse...",
and asking me to click on a link "...to avoid terminating your
account...".
The link? Starts off simple enough:
ht|p://in.rd.yahoo.com/in/fp/dir/
But in full :
ht|p://in.rd.yahoo.com/in/fp/dir/?ht|p://tjek.nu/7k
["|" sub'ed for "t" to make sure nothing turns them into active links]
In other words, using a "legitimate" yahoo address to re-direct to,
well,
wherever-the-heck it redirected to. I've tested that it does re-direct
by sub'ing my own URL for the "tjek.nu" one, and it does do so,
without any message, warning, information or option.
'Course, I don't click *any* link without checking it six-ways-from-
sunday,
but still...
Tracy Hall
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