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Mozilla Foundation Security Advisory 2010-28

Title: Freed object reuse across plugin instances
Impact: Critical
Announced: June 22, 2010
Reporter: Microsoft Vulnerability Research
Products: Firefox, SeaMonkey

Fixed in: Firefox 3.6.4
  Firefox 3.5.10
  SeaMonkey 2.0.5

Description

Microsoft Vulnerability Research reported that two plugin instances could interact in a way in which one plugin gets a reference to an object owned by a second plugin and continues to hold that reference after the second plugin is unloaded and its object is destroyed. In these cases, the first plugin would contain a pointer to freed memory which, if accessed, could be used by an attacker to execute arbitrary code on a victim's computer.

References