From 197038fbed7314c07d70612e51008dfd91b1d654 Mon Sep 17 00:00:00 2001 From: TrellixVulnTeam Date: Thu, 27 Oct 2022 23:57:53 +0000 Subject: [PATCH] Adding tarfile member sanitization to extractall() --- project.py | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/project.py b/project.py index a9deda4..c0b00d1 100644 --- a/project.py +++ b/project.py @@ -1032,7 +1032,26 @@ def _ExtractArchive(self, tarpath, path=None): """ try: with tarfile.open(tarpath, 'r') as tar: - tar.extractall(path=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=path) return True except (IOError, tarfile.TarError) as e: _error("Cannot extract archive %s: %s", tarpath, str(e))