[Security] tarfile.extractall without member validation

[sudabg]

Severity: HIGH (Bandit B202 - tarfile_unsafe_members)

Vulnerability

tarfile.extractall() without member validation allows path traversal (zip slip attack).

Fix

import os

def _is_within_directory(directory, target):
    abs_directory = os.path.realpath(directory)
    abs_target = os.path.realpath(target)
    return abs_target.startswith(abs_directory + os.sep) or abs_target == 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(f"Path traversal attempt: {member.name}")
    tar.extractall(path, members, numeric_owner=numeric_owner)

References

• CWE-22: Path Traversal
• Bandit B202