QuickTime in Apple Mac OS X 10.6.x before 10.6.5 accesses uninitialized memory locations during processing of GIF image data, which allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted GIF file.
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.