full-disclosure - JAWmail XSS

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From: ulfh at update.uu.se (Ulf Harnhammar)
Subject: JAWmail XSS

JAWmail XSS

PROGRAM: JAWmail
VENDOR: Rudi Benkovic <rudi@...mail.org> et al.
HOMEPAGE: http://www.jawmail.org/
VULNERABLE VERSIONS: 1.0-rc1, possibly others
IMMUNE VERSIONS: 2.0-rc1 and later
LOGIN REQUIRED: no
SEVERITY: high

DESCRIPTION:

JAWmail (Just Another Web Mail) is a pretty ambitious web mail
client project. It is written in PHP, and it is published under
the GNU GPL.

SUMMARY:

There are several cross-site scripting holes in JAWmail that 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.

TECHNICAL 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>

// Ulf Harnhammar
ulfh@...ate.uu.se
http://www.metaur.nu/