FFmpeg through 9.0.2 contains a heap buffer overflow in the GIF encoder's gif_image_write_image() in libavcodec/gif.c because shrunk_buf is sized from the first frame's linesize. Attackers can supply PAL8 video whose frame linesize grows mid-stream, causing remap_frame_to_palette() to write past shrunk_buf and corrupt the heap during GIF transcoding.

FFmpeg through 9.0.2 contains a heap buffer overflow in the GIF encoder's gif_image_write_image() in libavcodec/gif.c because shrunk_buf is sized from the first frame's linesize. Attackers can supply PAL8 video whose frame linesize grows mid-stream, causing remap_frame_to_palette() to write past shrunk_buf and corrupt the heap during GIF transcoding.

Ein Angreifer kann mehrere Schwachstellen in ffmpeg ausnutzen, um einen Denial-of-Service-Zustand auszulösen, Daten zu manipulieren oder offenzulegen, Sicherheitsmaßnahmen zu umgehen, Speicherbeschädigungen zu verursachen und möglicherweise beliebigen Code auszuführen.