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Mozilla Foundation Security Advisory 2015-110

Dragging and dropping images exposes final URL after redirects

Announced
September 22, 2015
Reporter
Mario Gomes
Impact
Moderate
Products
Firefox, Firefox ESR, Firefox OS, SeaMonkey, Thunderbird
Fixed in
  • Firefox 41
  • Firefox ESR 38.3
  • Firefox OS 2.5
  • SeaMonkey 2.38
  • Thunderbird 38.3

Description

Security researcher Mario Gomes reported that when a previously loaded image on a page is drag and dropped into content after a redirect, the redirected URL is available to scripts. This is a violation of the Fetch specification's defined behavior for "Atomic HTTP redirect handling" which states that redirected URLs are not exposed to any APIs. This can allow for information leakage.

In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.

References