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Mozilla Foundation Security Advisory 2013-12
Title: Buffer overflow in Javascript string concatenation
Impact: Critical
Announced: January 8, 2013
Reporter: pa_kt
Products: Firefox, Thunderbird, SeaMonkey
Fixed in: Firefox 18.0
Firefox ESR 10.0.12
Firefox ESR 17.0.2
Thunderbird 17.0.2
Thunderbird ESR 10.0.12
Thunderbird ESR 17.0.2
SeaMonkey 2.15
Description
Security researcher pa_kt reported a flaw via TippingPoint's Zero Day Initiative that an integer overflow is possible when calculating the length for a Javascript string concatenation, which is then used for memory allocation. This results in a buffer overflow, leading to a potentially exploitable memory corruption.
In general these flaws cannot be exploited through email in the Thunderbird and SeaMonkey products because scripting is disabled, but are potentially a risk in browser or browser-like contexts in those products.
