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Issue : Outlook Express address book allows
messages to be intercepted by 3rd party
Date Released : 16 March 2001
Vendor Notified : 16 March 2001
Author : 3APA3A <3APA3A@security.nnov.ru>
Affected : Outlook Exress 5.5SP1 and prior
Discovered : 18 December 2000 by 3APA3A
Remotely Exploitable : Yes
Vendor URL : http://www.microsoft.com
SECURITY.NNOV advisories: http://www.security.nnov.ru/advisories
Description:
It's possible for remote user to cause messages written for one e-mail
address to be delivered to another e-mail address.
Details:
Outlook Express has option "Automatically put people I reply to in my
address book". Then enabled, this option causes Outlook to make
automatically new address book entries mapping NAME of received
message to e-mail ADDRESS. Then message is composed Outlook Express
checks address book for NAME and sets complete e-mail ADDRESS instead.
Exploitation:
Situation: 2 good users G1 and G2 with addresses g1@mail.com and
g2@mail.com and one bad user B, b@mail.com. Imagine B wants to get
messages G1 sends to G2. Scenario:
1. B composes message with headers:
From: "g2@mail.com" <b@mail.com>
Reply-To: "g2@mail.com" <b@mail.com>
To: G1 <g1@mail.com>
Subject: how to catch you on Friday?
and sends it to g1@mail.com
2. G1 receives mail, which looks absolutely like mail received from
g2@mail.com and replies it. Reply will be received by B. In this case
new entry is created in address book pointing NAME "g2@mail.com" to
ADDRESS b@mail.com.
3. Now, if while composing new message G1 directly types e-mail
address g2@mail.com instead of G2, Outlook will compose address as
"g2@mail.com" <b@mail.com> and message will be received by B.
Workaround:
Disable "Automatically put people I reply to in my address book"
option.
Vendor:
Microsoft was contacted, accepted problem and replied it's impossible
to fix it until next IE 5.5 SP.
Solution:
No yet.
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