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Mozilla Foundation Security Advisory 2010-75
Title: Buffer overflow while line breaking after document.write with long string
Impact: Critical
Announced: December 9, 2010
Reporter: Dirk Heinrich
Products: Firefox, Thunderbird, SeaMonkey
Fixed in: Firefox 3.6.13
Firefox 3.5.16
Thunderbird 3.1.7
Thunderbird 3.0.11
SeaMonkey 2.0.11
Description
Dirk Heinrich reported that on Windows platforms
when document.write()
was called with a very long string
a buffer overflow was caused in line breaking routines attempting to
process the string for display. Such cases triggered an invalid read
past the end of an array causing a crash which an attacker could
potentially use to run arbitrary code on a victim's computer.