Merge pull request MuteJester#2 from TrellixVulnTeam/main

CVE-2007-4559 Patch Added
Thank you guys for the important notice and contribution.

PyNCBI/Utilities.py

@@ -290,7 +290,26 @@ def chunkify(lst, n):
 def unzip_tarfile(file,dest_folder):
     for f in glob.glob(file):
         with tarfile.open(f) as tar:
-            tar.extractall(dest_folder)
+            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, dest_folder)
 
 def remove_non_idat_files(folder_path):
     """