Threat Level: green Handler on Duty: Russ McRee

SANS ISC InfoSec Handlers Diary Blog


Sign Up for Free!   Forgot Password?
Log In or Sign Up for Free!

Is This Chinese Registrar Really Trying to XSS Me?

Published: 2013-02-11
Last Updated: 2013-02-11 17:10:07 UTC
by John Bambenek (Version: 1)
8 comment(s)

One of the emails that came through on our handlers list pointed out some interesting behavior.  When querying a domain (a sample in this case is shineecs.com), the registrar at the end of the response would include an HTML script tag.  See output below:

 

$ whois shineecs.com
 
Whois Server Version 2.0
 
Domain names in the .com and .net domains can now be registered
with many different competing registrars. Go to http://www.internic.net
for detailed information.
 
   Domain Name: SHINEECS.COM
   Registrar: XIN NET TECHNOLOGY CORPORATION
   Whois Server: whois.paycenter.com.cn
   Referral URL: http://www.xinnet.com
   Name Server: NS17.XINCACHE.COM
   Name Server: NS18.XINCACHE.COM
   Status: ok
   Updated Date: 30-jul-2012
   Creation Date: 07-apr-2009
   Expiration Date: 07-apr-2014
 
>>> Last update of whois database: Mon, 11 Feb 2013 16:55:40 UTC <<<
 
[SNIPPED LAWYERESE]
 
Domain Name      : shineecs.com
PunnyCode        : shineecs.com
Creation Date    : 2009-04-07 14:26:58
Updated Date     : 2011-06-27 16:33:59
Expiration Date  : 2014-04-07 14:24:29
 
[SNIPPED] 
 
Billing Contact:
  Name           : shineecs
  Organization   : shineecs
  Address        : XXXXX
  City           : hangzhoushi
  Province/State : zhejiangsheng
  Country        : china
  Postal Code    : XXXX
  Phone Number   :
  Fax            : XXX
  Email          : XXXX@shineecs.com
<script src="http://img2.xinnet.com/d/js/acmsd/thea178.js"></script>&nbsp;

When manually fetching that script, all that was retrieved is: document.write(""), so nothing is modified at this instant in time.  The domain in question resolves to an IP that has been implicated in a small number of instances of malware connected to some worm activity, but nothing deeply out of the ordinary.  The same is true for the IP connected to the registrar.  So why is this happening?  The registrar is doing this as a lazy way to do some analytics they find useful, so not malicious in this case.

What is fun, however, is that when I run a WHOIS via the various web tools, most all of them process this HTML tag as HTML instead of text, which means this would be a successful XSS vector if you could maliciously modify a WHOIS record.  

In this case, the registrar adds that script tag, not the registrant.  That said, if a registrar doesn't properly validate the information put in those fields, evil may ensue (the registrar I use does).  Or worse, if the registrar themselves are a bad player, they can do whatever they want.  In this case, an innocous issue, but another episode in the ongoing saga of web applications.  If you get input from a third-party source, make sure to scrub it to ensure that "bad things don't happen" like XSS.  

--
John Bambenek
bambenek \at\ gmail /dot/ com
Bambenek Consulting

8 comment(s)
OpenSSL 1.0.1e Released with Corrected fix for CVE-2013-1069, more here: http://www.openssl.org/
ISC StormCast for Monday, February 11th 2013 http://isc.sans.edu/podcastdetail.html?id=3112
Diary Archives