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Mozilla Foundation Security Advisory 2009-49

Title: TreeColumns dangling pointer vulnerability
Impact: Critical
Announced: September 9, 2009
Reporter: TippingPoint ZDI
Products: Firefox

Fixed in: Firefox 3.5.3
  Firefox 3.0.14


An anonymous security researcher, via TippingPoint's Zero Day Initiative, reported that the columns of a XUL tree element could be manipulated in a particular way which would leave a pointer owned by the column pointing to freed memory. An attacker could potentially use this vulnerability to crash a victim's browser and run arbitrary code on the victim's computer.