Fix for CVE-2020-14343

Per suggestion https://github.com/yaml/pyyaml/issues/420#issuecomment-663888344
move a few constructors from full_load to unsafe_load.

lib/yaml/constructor.py

diff --git a/lib/yaml/constructor.py b/lib/yaml/constructor.py
index 794681c..c42ee34 100644
--- a/lib/yaml/constructor.py
+++ b/lib/yaml/constructor.py
@@ -722,18 +722,6 @@
     u'tag:yaml.org,2002:python/name:',
     FullConstructor.construct_python_name)
 
-FullConstructor.add_multi_constructor(
-    u'tag:yaml.org,2002:python/module:',
-    FullConstructor.construct_python_module)
-
-FullConstructor.add_multi_constructor(
-    u'tag:yaml.org,2002:python/object:',
-    FullConstructor.construct_python_object)
-
-FullConstructor.add_multi_constructor(
-    u'tag:yaml.org,2002:python/object/new:',
-    FullConstructor.construct_python_object_new)
-
 class UnsafeConstructor(FullConstructor):
 
     def find_python_module(self, name, mark):
@@ -751,6 +739,18 @@
             instance, state, unsafe=True)
 
 UnsafeConstructor.add_multi_constructor(
+    u'tag:yaml.org,2002:python/module:',
+    UnsafeConstructor.construct_python_module)
+
+UnsafeConstructor.add_multi_constructor(
+    u'tag:yaml.org,2002:python/object:',
+    UnsafeConstructor.construct_python_object)
+
+UnsafeConstructor.add_multi_constructor(
+    u'tag:yaml.org,2002:python/object/new:',
+    UnsafeConstructor.construct_python_object_new)
+
+UnsafeConstructor.add_multi_constructor(
     u'tag:yaml.org,2002:python/object/apply:',
     UnsafeConstructor.construct_python_object_apply)
 

lib3/yaml/constructor.py

diff --git a/lib3/yaml/constructor.py b/lib3/yaml/constructor.py
index 1948b12..619acd3 100644
--- a/lib3/yaml/constructor.py
+++ b/lib3/yaml/constructor.py
@@ -710,18 +710,6 @@
     'tag:yaml.org,2002:python/name:',
     FullConstructor.construct_python_name)
 
-FullConstructor.add_multi_constructor(
-    'tag:yaml.org,2002:python/module:',
-    FullConstructor.construct_python_module)
-
-FullConstructor.add_multi_constructor(
-    'tag:yaml.org,2002:python/object:',
-    FullConstructor.construct_python_object)
-
-FullConstructor.add_multi_constructor(
-    'tag:yaml.org,2002:python/object/new:',
-    FullConstructor.construct_python_object_new)
-
 class UnsafeConstructor(FullConstructor):
 
     def find_python_module(self, name, mark):
@@ -739,6 +727,18 @@
             instance, state, unsafe=True)
 
 UnsafeConstructor.add_multi_constructor(
+    'tag:yaml.org,2002:python/module:',
+    UnsafeConstructor.construct_python_module)
+
+UnsafeConstructor.add_multi_constructor(
+    'tag:yaml.org,2002:python/object:',
+    UnsafeConstructor.construct_python_object)
+
+UnsafeConstructor.add_multi_constructor(
+    'tag:yaml.org,2002:python/object/new:',
+    UnsafeConstructor.construct_python_object_new)
+
+UnsafeConstructor.add_multi_constructor(
     'tag:yaml.org,2002:python/object/apply:',
     UnsafeConstructor.construct_python_object_apply)
 

tests/lib/test_recursive.py

diff --git a/tests/lib/test_recursive.py b/tests/lib/test_recursive.py
index 312204e..04c5798 100644
--- a/tests/lib/test_recursive.py
+++ b/tests/lib/test_recursive.py
@@ -30,7 +30,7 @@
     output2 = None
     try:
         output1 = yaml.dump(value1)
-        value2 = yaml.load(output1, yaml.FullLoader)
+        value2 = yaml.load(output1, yaml.UnsafeLoader)
         output2 = yaml.dump(value2)
         assert output1 == output2, (output1, output2)
     finally:

tests/lib3/test_recursive.py

diff --git a/tests/lib3/test_recursive.py b/tests/lib3/test_recursive.py
index 74c2ee6..08042c8 100644
--- a/tests/lib3/test_recursive.py
+++ b/tests/lib3/test_recursive.py
@@ -31,7 +31,7 @@
     output2 = None
     try:
         output1 = yaml.dump(value1)
-        value2 = yaml.full_load(output1)
+        value2 = yaml.unsafe_load(output1)
         output2 = yaml.dump(value2)
         assert output1 == output2, (output1, output2)
     finally: