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OT: Secret email?!
- From: Joe Blanchard
- Date: Thu Nov 29 20:07:46 2001
Title: OT: Secret email?!
Greetings all
I know this might have been brought up before so please disregard if
so. Thought it might be of interest to some.
While looking for ways to indicate that nimda/codered ect was
pushed to a client within my network, I tripped across something
completely unrelated, but interesting.
It seems these email clients that utilize html formating also
send out information unknowingly. I know nothing new, but heres
the senario. A spam email arrives, client opens/previews the email
and its pretty gifs/jpgs ect, while at the bottom a link is retrieving
what looks like a logo. Example:
<a href=""http://www.em5000.com"><img src="javascript:void(0);">http://www.em5000.com/[email protected]&msgid=281101000" width="109" height="16" border="0" alt="em5000.com"></a>
What it does in fact is send information to a host
(from the firewall's view):
12:54:01: %PIX-5-304001: 10.1.1.10 Accessed URL 66.77.58.92:/counter.php?client=newhorizons&email=myemail@domain.com&msgid=281101000
(from the host's view):
GET /counter.php?client=newhorizons&[email protected]&msgid=281101000 HTTP/1.1
which in turn (I suppose) places my email address into a database thats used
for spaming. i.e. verifying that my email address is valid. While watching
for this behavior, I saw about 10 other nodes/users do this, none of which
knew the information had been sent out. Kind of sneaky if you ask me.
Cheers
-Joe
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