CVE-2007-4559 Patch

pymagnitude/third_party/allennlp/models/archival.py

@@ -119,7 +119,26 @@ def load_archive(archive_file     ,
         tempdir = tempfile.mkdtemp()
         logger.info("extracting archive file {resolved_archive_file} to temp dir {tempdir}")
         with tarfile.open(resolved_archive_file, u'r:gz') as archive:
-            archive.extractall(tempdir)
+            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, tempdir)
 
         serialization_dir = tempdir
 

pymagnitude/third_party/allennlp/tests/modules/token_embedders/elmo_token_embedder_test.py

@@ -55,7 +55,26 @@ def test_file_archiving(self):
         archive_file = os.path.join(serialization_dir, u'model.tar.gz')
         unarchive_dir = os.path.join(self.TEST_DIR, u'unarchive')
         with tarfile.open(archive_file, u'r:gz') as archive:
-            archive.extractall(unarchive_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, unarchive_dir)
 
         # It should contain `files_to_archive.json`
         fta_file = os.path.join(unarchive_dir, u'files_to_archive.json')