patch CVE-2007-4559

taskcluster/taskgraph/util/docker.py

@@ -136,8 +136,26 @@ def build_from_context(docker_bin, context_path, prefix, tag=None):
     d = tempfile.mkdtemp()
     try:
         with tarfile.open(context_path, 'r:gz') as tf:
-            tf.extractall(d)
-
+            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(tf, d)			
         # If we wanted to do post-processing of the Dockerfile, this is
         # where we'd do it.