Vulnerable Systems:
* Mozilla Firefox 17.0
* Mozilla Thunderbird 17.0
* Mozilla SeaMonkey 2.14
* Mozilla Firefox ESR 17.0
* Mozilla Thunderbird ESR 17.0
Multiple Mozilla products contain a use-after-free error in the mozilla::TrackUnionStream::EndTrack() function. This issue may allow a context-dependent attacker to dereference already freed heap memory and potentially execute arbitrary code.