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Mozilla Foundation Security Advisory 2012-96

Title: Memory corruption in str_unescape
Impact: High
Announced: November 20, 2012
Reporter: Scott Bell
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 17.0
  Thunderbird 17.0
  SeaMonkey 2.14


Security researcher Scott Bell of used the Address Sanitizer tool to discover a memory corruption in str_unescape in the Javascript engine. This could potentially lead to arbitrary code execution.

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.