Microsoft Edge Fetch API allows setting of arbitrary request headers

------------------------------------------------------------------------
Microsoft Edge Fetch API allows setting of arbitrary request headers
------------------------------------------------------------------------
Yorick Koster, January 2017

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
It was found that the Fetch API in Microsoft Edge allows websites to set
arbitrary HTTP request headers, including the Content-Length, and Host
headers. Amongst others, a malicious website can use this issue to
bypass the same origin policy, read HTTP response headers, or initiate
arbitrary HTTP requests from the victims browser (HTTP request
smuggling).

------------------------------------------------------------------------
See also
------------------------------------------------------------------------
- CVE-2017-0140
- MS17-007: Cumulative Security Update for Microsoft Edge (4013071)

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Microsoft Edge version
38.14393.0.0 (EdgeHTML 14.14393).

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
Microsoft released MS17-007 that fixes this vulnerability.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://www.securify.nl/advisory/SFY20170101/microsoft_edge_fetch_api_allows_setting_of_arbitrary_request_headers.html