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Mozilla Foundation Security Advisory 2005-40

Title: Missing Install object instance checks
Severity: Moderate
Reporter: Georgi Guninski
Products: Firefox, Mozilla Suite

Fixed in: Firefox 1.0.3
  Mozilla Suite 1.7.7


The native implementations of InstallTrigger and other XPInstall-related javascript objects did not properly validate that they were called on instances of the correct type. By passing other objects, even raw numbers, the javascript interpreter would jump to the wrong place in memory. Although no proof of concept has been developed we believe this could be exploited.


Disable Javascript.