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 an overflow condition in Canvas. The issue is triggered as user-supplied input is not properly validated when handling height and width values supplied via HTML. This may allow a context-dependent attacker to cause a stack-based buffer overflow, resulting in a denial of service or potentially execution of arbitrary code.