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Mozilla Foundation Security Advisory 2012-48

Title: use-after-free in nsGlobalWindow::PageHidden
Impact: Moderate
Announced: July 17, 2012
Reporter: Arthur Gerkis
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 14
  Firefox ESR 10.0.6
  Thunderbird 14
  Thunderbird ESR 10.0.6
  SeaMonkey 2.11


Security researcher Arthur Gerkis used the Address Sanitizer tool to find a use-after-free in nsGlobalWindow::PageHidden when mFocusedContent is released and oldFocusedContent is used afterwards. This use-after-free could possibly allow for remote code execution.