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CVE-2007-4559 Patch #367

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CVE-2007-4559 Patch #367

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21 changes: 20 additions & 1 deletion data-processing/common/unpack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,26 @@ def unpack_archive(archive_path: str, dest_dir: str) -> None:
# quarantines TeX and the compilation process using chroot.
try:
with tarfile.open(archive_path, mode="r:gz") as archive:
archive.extractall(dest_dir, members=get_safe_files(archive, dest_dir))
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(archive, dest_dir, members=get_safe_files(archive,dest_dir))
logging.debug("Unpacked %s as a tar archive", archive_path)
return
except tarfile.ReadError:
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