Here is a new type of possible malware that is not stopped by
standard demime/attachment stripping.
I have just added a check for the regular expression
and messages which match this regexp will be bounced to the
moderators as containing a "Potentially malicious link".
You may want to consider doing the same.
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X-From_: bugtraq-return-229-nb=thinkcoach .
com Thu May 31 18:38:05 2001
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From: mparcens @
Date: Wed, 30 May 2001 19:18:08 -0500 (EDT)
To: bugtraq @
Content-type: multipart/mixed; boundary="Hushpart_boundary_dAfMJfpqUApfpvnobyxrXSpSoIJaULVu"
Subject: Yahoo/Hotmail scripting vulnerability, worm propagation
Title: Yahoo/Hotmail scripting vulnerability, worm propagation
Cross-site-scripting holes in Yahoo and Hotmail make it possible to replicate
a Melissa-type worm through those webmail services.
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
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 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
Sample links and the worm code can be found at: http://www.sidesport.com/webworm/
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
Both Yahoo and Hotmail were notified on May 23 2001.
Free, encrypted, secure Web-based email at www.hushmail.com
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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