Command and Control
MP4Box is a component of GPAC-2.0.0, which is a widely-used third-party package on RPM Fusion. When MP4Box tries to parse a MP4 file, it calls the function
diST_box_read() to read from video. In this function, it allocates a buffer
str with fixed length. However, content read from
bs is controllable by user, so is the length, which causes a buffer overflow.