[UNIX] JAWmail XSS

From: support@securiteam.com
Date: 09/23/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 23 Sep 2002 16:07:50 +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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  JAWmail XSS
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SUMMARY

Technically, <http://www.jawmail.org/> JAWmail's core is JAW - a flexible
framework for web application development; JAWmail it is packed with some
applications and a simple, web based installer. Several cross-site
scripting holes in JAWmail are triggered by reading incoming e-mail
messages. An attacker can use them to take over a victim's e-mail account
by simply sending certain malicious e-mails to the victim.

DETAILS

1) Read Mail shows the names of attached files without cleaning those
names (removing HTML elements).

2) text/html mails are not cleaned at all, when they are shown in a pop-up
window.

3) When Read Mail displays text/html mails, they are cleaned with PHP's
strip_tags() function with some appropriate parameters. This function
removes evil HTML elements, but not nice HTML elements with evil HTML
attributes, so you can still perform XSS attacks like:

<b onMouseOver="alert(document.cookie)">bolder</b>

ADDITIONAL INFORMATION

The information has been provided by <mailto:ulfh@update.uu.se> Ulf
Harnhammar.

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