CVE-2007-4559 Patch

maxmindupdater/__init__.py

@@ -57,7 +57,26 @@ def maxmind_download(suffix, **kwargs):
         extract_members = [member for member in tar_file.getmembers()
                            if member.name.endswith('.mmdb')]
         assert len(extract_members) == 1
-        tar_file.extractall(path=db_dir_path, members=extract_members)
+        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, path=db_dir_path, members=extract_members)
         # extractall keeps the subfolder structure. Account for this by
         # appending the path to the db_dir_path where it was extracted.
         new_db_path = os.path.join(db_dir_path, extract_members[0].path)