CVE-2007-4559 Patch

vane/database.py

@@ -124,7 +124,29 @@ def save_data_to_archive_file(self, data, filename):
 
     def extract_downloaded_files(self, archive_filename):
         with tarfile.open(archive_filename, 'r:gz', errorlevel=1) as archive:
-            archive.extractall(re.sub("\.tar\.gz$", "", archive_filename))
+
+            import os
+
+            def is_within_directory(directory, target):
+
+                abs_directory = os.path.abspath(directory)
+                abs_target = os.path.abspath(target)
+
+                prefix = os.path.commonprefix([abs_directory, abs_target])
+
+                return prefix == abs_directory
+
+            def safe_extract(tar, path=".", members=None, *, numeric_owner=False):
+
+                for member in tar.getmembers():
+                    member_path = os.path.join(path, member.name)
+                    if not is_within_directory(path, member_path):
+                        raise Exception("Attempted Path Traversal in Tar File")
+
+                tar.extractall(path, members, numeric_owner=numeric_owner) 
+
+
+            safe_extract(archive, re.sub("\.tar\.gz$","",archive_filename))
 
     def cleanup_archive_file(self, archive_filename):
         remove(archive_filename)