Microsoft Edge Fetch API allows setting of arbitrary request headers

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

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Abstract
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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 victim's browser (HTTP request
smuggling).

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

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

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Fix
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Microsoft released MS17-007 that fixes this vulnerability.

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