Microsoft Outlook Express Address Book Spoofing Vulnerability

Microsoft Outlook Express Address Book Spoofing Vulnerability

This example supplied by by 3APA3A <3APA3A@SECURITY.NNOV.RU>:

Situation: 2 good users Target1 and Target2 with addresses target1@example.com and
target2@example.com and one bad user Attacker, attacker@example.com. Imagine Attacker wants to get
messages Target1 sends to Target2. Scenario:

1. Attacker composes message with headers:

From: "target2@example.com" <attacker@example.com>
Reply-To: "target2@example.com" <attacker@example.com>
To: Target1 <target1@example.com>
Subject: how to catch you on Friday?

and sends it to target1@example.com

2. Target1 receives mail, which looks absolutely like mail received from
target2@example.com and replies it. Reply will be received by Attacker. In this case
new entry is created in address book pointing NAME "target2@example.com" to
ADDRESS attacker@example.com.

3. Now, if while composing new message Target1 directly types e-mail
address target2@example.com instead of Target2, Outlook will compose address as
"target2@example.com" <attacker@example.com> and message will be received by Attacker.