Cross-site Scripting (XSS) Vulnerability in Fast Secure Contact Form

Advisory ID:HTB23036
Product:Fast Secure Contact Form
Vendor:Mike Challis
Vulnerable Versions: and probably prior
Tested Version:
Advisory Publication:July 27, 2011 [without technical details]
Vendor Notification:July 27, 2011
Public Disclosure:August 17, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in Fast Secure Contact Form wordpress plugin, which can be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in Fast Secure Contact Form WordPress Plugin
Input appended to the URL after /wp-content/plugins/si-contact-form/captcha/test/index.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of affected website.
Exploitation example:
http://[host]/wp-content/plugins/si-contact-form/captcha/test/index.php/%22% 3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E

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[1] High-Tech Bridge Advisory HTB23036 - - Cross-site Scripting (XSS) Vulnerability in Fast Secure Contact Form
[2] Fast Secure Contact Form - - This free contact form software lets your visitors send you a quick E-mail message.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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