Uninitialized memory use during GIF rendering

2014-09-02T00:00:00
ID MFSA2014-69
Type mozilla
Reporter Mozilla Foundation
Modified 2014-09-02T00:00:00

Description

Google security researcher Michal Zalewski discovered that when a malformated GIF image is rendered in certain circumstances, memory is not properly initialized before use. The resulting image then uses this memory during rendering. This could allow for the a script in web content to access this unitialized memory using the <canvas> feature.