[NEWS] Lycos HTMLGear Guestbook Script Injection Vulnerability

From: support@securiteam.com
Date: 09/16/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 16 Sep 2002 14:58:49 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Lycos HTMLGear Guestbook Script Injection Vulnerability
------------------------------------------------------------------------

SUMMARY

Lycos offers several advanced web applications through a service called
HTMLGear. Among the services offered are guestbooks. A vulnerability
exists in the Lycos guestbook that could enable someone to launch an
attack against visitors whose browsers supported inline CSS (IE, for
example).

DETAILS

By specifying an e-mail address/web page URL like the following:

" STYLE="expression([javascript])

The JavaScript block will execute. Some less-paranoid versions of the
guestbook also allow a typical IMG attack:

<IMG SRC="javascript:[javascript]">

This will yield the same results in many cases.

ADDITIONAL INFORMATION

The information has been provided by <mailto:mattmurphy@kc.rr.com>
Matthew Murphy.

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