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CVE-2007-4559 Patch #1

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CVE-2007-4559 Patch #1

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21 changes: 20 additions & 1 deletion docs/python/uncompress_ls.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,26 @@ def uncompress_ls(dirname,temp_dir='temp'):
temp_dir = temp_dir or tempfile.mkdtemp()
with tarfile.open(tar_path, 'r') as tar_file:
thisDict = {}
tar_file.extractall(temp_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(tar_file, temp_dir)
# Move the extracted xml directory to its final location
try:
shutil.move(glob(temp_dir+'/*xml')[0], extraction_dir)
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