Issue python#22885: Fixed arbitrary code execution vulnerability in the dbm.dumb

serhiy-storchaka · serhiy-storchaka · commit 74eb8b2d1a1d · 2015-02-16T00:30:43.000+02:00
module.  Original patch by Claudiu Popa.
diff --git a/Lib/dbm/dumb.py b/Lib/dbm/dumb.py
@@ -21,6 +21,7 @@
 
 """
 
+import ast as _ast
 import io as _io
 import os as _os
 import collections
@@ -85,7 +86,7 @@ def _update(self):
             with f:
                 for line in f:
                     line = line.rstrip()
-                    key, pos_and_siz_pair = eval(line)
+                    key, pos_and_siz_pair = _ast.literal_eval(line)
                     key = key.encode('Latin-1')
                     self._index[key] = pos_and_siz_pair
 
diff --git a/Lib/test/test_dbm_dumb.py b/Lib/test/test_dbm_dumb.py
@@ -217,6 +217,15 @@ def test_check_closed(self):
             self.assertEqual(str(cm.exception),
                              "DBM object has already been closed")
 
+    def test_eval(self):
+        with open(_fname + '.dir', 'w') as stream:
+            stream.write("str(print('Hacked!')), 0\n")
+        with support.captured_stdout() as stdout:
+            with self.assertRaises(ValueError):
+                with dumbdbm.open(_fname) as f:
+                    pass
+            self.assertEqual(stdout.getvalue(), '')
+
     def tearDown(self):
         _delete_files()
 
diff --git a/Misc/NEWS b/Misc/NEWS
@@ -13,6 +13,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #22885: Fixed arbitrary code execution vulnerability in the dbm.dumb
+  module.  Original patch by Claudiu Popa.
+
 - Issue #23146: Fix mishandling of absolute Windows paths with forward
   slashes in pathlib.
 
