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Mozilla Foundation Security Advisory 2010-69

Cross-site information disclosure via modal calls

Announced
October 19, 2010
Reporter
Eduardo Vela Nava
Impact
High
Products
Firefox, SeaMonkey, Thunderbird
Fixed in
  • Firefox 3.5.14
  • Firefox 3.6.11
  • SeaMonkey 2.0.9
  • Thunderbird 3.0.9
  • Thunderbird 3.1.5

Description

Security researcher Eduardo Vela Nava reported that if a web page opened a new window and used a javascript: URL to make a modal call, such as alert(), then subsequently navigated the page to a different domain, once the modal call returned the opener of the window could get access to objects in the navigated window. This is a violation of the same-origin policy and could be used by an attacker to steal information from another web site.

References