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Microsoft Hotmail May Allow a Worm to Send Mail to Other Destinations Listed in a Remote User's Inbox
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SecurityTracker Alert ID: 1001661 |
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SecurityTracker URL: http://securitytracker.com/id/1001661
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jun 1 2001
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Impact:
Execution of arbitrary code via network
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Exploit Included: Yes
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Description:
A vulnerability has been reported in Microsoft Hotmail that reportedly makes it possible for a remote user to send e-mail to a recipient containing Javascript code in a link that will be executed if the link is clicked. The Javascript code could then automatically send mail to all of the destinations listed in the recipient's inbox without user intervention.
To trigger the cross-site scripting vulnerability, a remote user can send an e-mail message to the target recipient, where the e-mail contains a link to Microsoft's own server. If the link contains escaped Javascript, it will be executed when the recipient clicks on the link (this is a requirement). That javascript could then open a window on the recipient's browser that could nagivate through the recipient's inbox, sending messages to all e-mail addresses listed in the recipient's inbox. Because the malicious javascript code is executing inside a page from the mail service's own server, there will reportedly be no domain-bounding error when the javascript is controlling the window with the victim's inbox.
Some sample links and the worm code are available at:
http://www.sidesport.com/webworm/
The vendor was reportedly notified (note that the vendor responded publicly that it was *not* originally notified of this, but is now aware of the report and is investigating.
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Impact:
A remote user could send e-mail containing Javascript code that, when clicked by the Hotmail recipient, will send out e-mail to all addresses listed in the recipient's inbox.
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Solution:
No solution was available at the time of this entry.
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Vendor URL: www.microsoft.com/technet/security/ (Links to External Site)
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Cause:
Input validation error
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Underlying OS:
Linux (Any), MacOS, UNIX (Any), Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Wed, 30 May 2001 19:18:08 -0500 (EDT)
Subject: Yahoo/Hotmail scripting vulnerability, worm propagation
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--Hushpart_boundary_dAfMJfpqUApfpvnobyxrXSpSoIJaULVu
Content-type: text/plain
Title: Yahoo/Hotmail scripting vulnerability, worm propagation
Synopsis
Cross-site-scripting holes in Yahoo and Hotmail make it possible to replicate
a Melissa-type worm through those webmail services.
Description
An email is sent to the victim, who uses Yahoo Mail or Hotmail. Inside the
email is a link to yahoo or hotmail's own server. The link contains escaped
javascript that is executed when the page is loaded. That javascript then
opens a window that could nagivate through the victim's inbox, sending messages
with the malicious link to every email address it finds in the inbox. Because
the malicious javascript executes inside a page from the mail service's
own server, there is no domain-bounding error when the javascript is controlling
the window with the victim's inbox.
Who is vulnerable
Users of the Yahoo Mail and Hotmail service. Although the exploit requires
a user to click on a link, two things work for this exploit. (1) The email
comes from a familiar user (sent by the worm), and (2) The link is to a
familiar, trusted server. Theoretically, more services are vulnerable, due
to the proliferation of these holes, but the worm is limited to web mail
services.
Proof-of-Concept
Sample links and the worm code can be found at: http://www.sidesport.com/webworm/
Solution
Escaping all query data that is echoed to the screen eliminates this problem.
This must be done on every page on a server that can send or read mail for
the service.
Vendor Status
Both Yahoo and Hotmail were notified on May 23 2001.
-mparcens
mparcens@hushmail.com
Free, encrypted, secure Web-based email at www.hushmail.com
--Hushpart_boundary_dAfMJfpqUApfpvnobyxrXSpSoIJaULVu--
IMPORTANT NOTICE: If you are not using HushMail, this message could have been read easily by the many people who have access to your
open personal email messages.
Get your FREE, totally secure email address at http://www.hushmail.com.
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