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Adding tarfile member sanitization to extractall() (#23906)

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Co-authored-by: Šimon Brandner <simon.bra.ag@gmail.com>
Co-authored-by: TrellixVulnTeam <charles.mcfarland@trellix.com>
This commit is contained in:
Michael Telatynski 2022-12-05 17:03:17 +00:00 committed by GitHub
parent 2cf4c5a26f
commit 7defcf3957
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1 changed files with 18 additions and 1 deletions
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19
scripts/deploy.py
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@ -98,7 +98,24 @@ class Deployer:
try:
with tarfile.open(tarball) as tar:
tar.extractall(extract_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, extract_path)
finally:
if self.should_clean and downloaded:
os.remove(tarball)