diff --git a/scripts/install_from_zip.py b/scripts/install_from_zip.py index 7c2a0c6..f9c2cd3 100755 --- a/scripts/install_from_zip.py +++ b/scripts/install_from_zip.py @@ -23,7 +23,26 @@ def unarchive(afile): if tarfile.is_tarfile(afile): print("Archive is a tarfile") with tarfile.open(afile) as tar: - tar.extractall() + 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) return tar.namelist() elif zipfile.is_zipfile(afile): print("Archive is a zipfile")