diff --git a/examples/flower_classifier/train.py b/examples/flower_classifier/train.py index 9db15a4..2e5af8e 100644 --- a/examples/flower_classifier/train.py +++ b/examples/flower_classifier/train.py @@ -32,7 +32,26 @@ def download_input(): import tarfile print("decompressing flower_photos.tgz to '{}'".format(os.path.abspath("flower_photos"))) with tarfile.open("flower_photos.tgz") as tar: - tar.extractall(path="./") + def is_within_directory(directory, target): + + abs_directory = os.path.abspath(directory) + abs_target = os.path.abspath(target) + + prefix = os.path.commonprefix([abs_directory, abs_target]) + + return prefix == abs_directory + + def safe_extract(tar, path=".", members=None, *, numeric_owner=False): + + for member in tar.getmembers(): + member_path = os.path.join(path, member.name) + if not is_within_directory(path, member_path): + raise Exception("Attempted Path Traversal in Tar File") + + tar.extractall(path, members, numeric_owner=numeric_owner) + + + safe_extract(tar, path="./") @click.command(help="Trains an Keras model on flower_photos dataset."