An issue was discovered in ImageMagick 6.9.7. A specially crafted sun file triggers a heap-based buffer over-read.
https://github.com/ImageMagick/ImageMagick/issues/376
https://github.com/ImageMagick/ImageMagick/issues/375
https://github.com/ImageMagick/ImageMagick/commit/3007531bfd326c5c1e29cd41d2cd80c166de8528
https://bugs.debian.org/856879