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Mozilla Foundation Security Advisory 2010-48

Title: Dangling pointer crash regression from plugin parameter array fix
Impact: Critical
Announced: July 20, 2010
Reporter: Daniel Holbert
Products: Firefox 3.6.7

Fixed in: Firefox 3.6.8


Mozilla developer Daniel Holbert reported that the fix to the plugin parameter array crash that was fixed in Firefox 3.6.7 caused a crash showing signs of memory corruption. In certain circumstances, properties in the plugin instance's parameter array could be freed prematurely leaving a dangling pointer that the plugin could execute, potentially calling into attacker-controlled memory.

Firefox 3.5.11 was also affected by the regression but the equivalent pointer was always initialized to NULL and not exploitable.