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Mozilla Foundation Security Advisory 2007-08

onUnload + document.write() memory corruption

Announced
February 25, 2007
Reporter
Michal Zalewski
Impact
Critical
Products
Firefox, SeaMonkey
Fixed in
  • Firefox 1.5.0.10
  • Firefox 2.0.0.2
  • SeaMonkey 1.0.8

Description

Michal Zalewski reported a memory corruption vulnerability in Firefox 2.0.0.1 involving mixing the onUnload event handler and self-modifying document.write() calls. This flaw was introduced in Firefox 2.0.0.1 and 1.5.0.9 and does not affect earlier versions; it is fixed in Firefox 2.0.0.2 and 1.5.0.10

Workaround

Disable JavaScript until a fixed version can be installed.

References