Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

Mozilla Foundation Security Advisory 2015-60

Local files or privileged URLs in pages can be opened into new tabs

Announced
July 2, 2015
Reporter
Jann Horn
Impact
Moderate
Products
Firefox, Firefox ESR, SeaMonkey
Fixed in
  • Firefox 39
  • Firefox ESR 38.1
  • SeaMonkey 2.35

Description

Security researcher Jann Horn reported that when Mozilla Foundation Security Advisory 2015-25 was fixed in Firefox 37, an error was made that caused the fix to not be applied to Firefox 38, effectively causing the bug to be unfixed in Firefox 38 (and Firefox ESR38) once it shipped. As Armin Ebert reported for that issue, opening hyperlinks on a page with the mouse and specific keyboard key combinations could allow a Chrome privileged URL to be opened without context restrictions being preserved. This could allow for local files or resources from a known location to be opened with local privileges, bypassing security protections.

References