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[Mahara Bot <1470281@xxxxxxxxxxxxxxxxxx>]

Patch for "1.9_STABLE" branch: https://reviews.mahara.org/4950

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https://bugs.launchpad.net/bugs/1470281

Title:
  Use "nosniff" header to prevent potential XSS via untrusted files in
  IE

Status in Mahara ePortfolio:
  Fix Committed
Status in Mahara 1.10 series:
  Fix Committed
Status in Mahara 1.9 series:
  Fix Committed
Status in Mahara 15.04 series:
  In Progress
Status in Mahara 15.10 series:
  Fix Committed

Bug description:
  Yuliya posted this one directly into Gerrit:
  https://reviews.mahara.org/#/c/4821/

  Use nosniff header to prevent potential XSS via untrusted files in IE

  See
   - https://msdn.microsoft.com/en-us/library/gg622941(v=vs.85).aspx
   - https://www.owasp.org/index.php/List_of_useful_HTTP_headers

  Solution is to add it to file serving code in places where we do
  forced download of files.

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