Buffer overflow in Apple Quicktime Player 7.3.1.70 and other versions before 7.4.1, when RTSP tunneling is enabled, allows remote attackers to execute arbitrary code via a long Reason-Phrase response to an rtsp:// request, as demonstrated using a 404 error message.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.