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Mozilla Foundation Security Advisory 2012-99

XrayWrappers exposes chrome-only properties when not in chrome compartment

Announced
November 20, 2012
Reporter
Peter Van der Beken
Impact
High
Products
Firefox, SeaMonkey, Thunderbird
Fixed in
  • Firefox 17
  • SeaMonkey 2.14
  • Thunderbird 17

Description

Mozilla developer Peter Van der Beken discovered that same-origin XrayWrappers expose chrome-only properties even when not in a chrome compartment. This can allow web content to get properties of DOM objects that are intended to be chrome-only.

In general these flaws cannot be exploited through email in the Thunderbird and SeaMonkey products because scripting is disabled, but are potentially a risk in browser or browser-like contexts in those products.

References