Fixed CVE-2022-28346 -- Protected QuerySet.annotate(), aggregate(), and extra() against SQL injection in column aliases.

felixxm · felixxm · commit 93cae5cb2f9a · 2022-04-11T08:59:33.000+02:00
Thanks Splunk team: Preston Elder, Jacob Davis, Jacob Moore,
Matt Hanson, David Briggs, and a security researcher: Danylo Dmytriiev
(DDV_UA) for the report.
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
@@ -40,10 +40,15 @@
 from django.db.models.sql.datastructures import BaseTable, Empty, Join, MultiJoin
 from django.db.models.sql.where import AND, OR, ExtraWhere, NothingNode, WhereNode
 from django.utils.functional import cached_property
+from django.utils.regex_helper import _lazy_re_compile
 from django.utils.tree import Node
 
 __all__ = ["Query", "RawQuery"]
 
+# Quotation marks ('"`[]), whitespace characters, semicolons, or inline
+# SQL comments are forbidden in column aliases.
+FORBIDDEN_ALIAS_PATTERN = _lazy_re_compile(r"['`\"\]\[;\s]|--|/\*|\*/")
+
 
 def get_field_names_from_opts(opts):
     if opts is None:
@@ -1091,8 +1096,16 @@ def join_parent_model(self, opts, model, alias, seen):
             alias = seen[int_model] = join_info.joins[-1]
         return alias or seen[None]
 
+    def check_alias(self, alias):
+        if FORBIDDEN_ALIAS_PATTERN.search(alias):
+            raise ValueError(
+                "Column aliases cannot contain whitespace characters, quotation marks, "
+                "semicolons, or SQL comments."
+            )
+
     def add_annotation(self, annotation, alias, is_summary=False, select=True):
         """Add a single annotation expression to the Query."""
+        self.check_alias(alias)
         annotation = annotation.resolve_expression(
             self, allow_joins=True, reuse=None, summarize=is_summary
         )
@@ -2269,6 +2282,7 @@ def add_extra(self, select, select_params, where, params, tables, order_by):
             else:
                 param_iter = iter([])
             for name, entry in select.items():
+                self.check_alias(name)
                 entry = str(entry)
                 entry_params = []
                 pos = entry.find("%s")
diff --git a/docs/releases/2.2.28.txt b/docs/releases/2.2.28.txt
@@ -5,3 +5,11 @@ Django 2.2.28 release notes
 *April 11, 2022*
 
 Django 2.2.28 fixes two security issues with severity "high" in 2.2.27.
+
+CVE-2022-28346: Potential SQL injection in ``QuerySet.annotate()``, ``aggregate()``, and ``extra()``
+====================================================================================================
+
+:meth:`.QuerySet.annotate`, :meth:`~.QuerySet.aggregate`, and
+:meth:`~.QuerySet.extra` methods were subject to SQL injection in column
+aliases, using a suitably crafted dictionary, with dictionary expansion, as the
+``**kwargs`` passed to these methods.
diff --git a/docs/releases/3.2.13.txt b/docs/releases/3.2.13.txt
@@ -7,6 +7,14 @@ Django 3.2.13 release notes
 Django 3.2.13 fixes two security issues with severity "high" in
 3.2.12 and a regression in 3.2.4.
 
+CVE-2022-28346: Potential SQL injection in ``QuerySet.annotate()``, ``aggregate()``, and ``extra()``
+====================================================================================================
+
+:meth:`.QuerySet.annotate`, :meth:`~.QuerySet.aggregate`, and
+:meth:`~.QuerySet.extra` methods were subject to SQL injection in column
+aliases, using a suitably crafted dictionary, with dictionary expansion, as the
+``**kwargs`` passed to these methods.
+
 Bugfixes
 ========
 
diff --git a/docs/releases/4.0.4.txt b/docs/releases/4.0.4.txt
@@ -7,6 +7,14 @@ Django 4.0.4 release notes
 Django 4.0.4 fixes two security issues with severity "high" and two bugs in
 4.0.3.
 
+CVE-2022-28346: Potential SQL injection in ``QuerySet.annotate()``, ``aggregate()``, and ``extra()``
+====================================================================================================
+
+:meth:`.QuerySet.annotate`, :meth:`~.QuerySet.aggregate`, and
+:meth:`~.QuerySet.extra` methods were subject to SQL injection in column
+aliases, using a suitably crafted dictionary, with dictionary expansion, as the
+``**kwargs`` passed to these methods.
+
 Bugfixes
 ========
 
diff --git a/tests/aggregation/tests.py b/tests/aggregation/tests.py
@@ -2048,6 +2048,15 @@ def test_exists_none_with_aggregate(self):
         )
         self.assertEqual(len(qs), 6)
 
+    def test_alias_sql_injection(self):
+        crafted_alias = """injected_name" from "aggregation_author"; --"""
+        msg = (
+            "Column aliases cannot contain whitespace characters, quotation marks, "
+            "semicolons, or SQL comments."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            Author.objects.aggregate(**{crafted_alias: Avg("age")})
+
     def test_exists_extra_where_with_aggregate(self):
         qs = Book.objects.annotate(
             count=Count("id"),
diff --git a/tests/annotations/tests.py b/tests/annotations/tests.py
@@ -1076,6 +1076,40 @@ def test_annotation_aggregate_with_m2o(self):
             ],
         )
 
+    def test_alias_sql_injection(self):
+        crafted_alias = """injected_name" from "annotations_book"; --"""
+        msg = (
+            "Column aliases cannot contain whitespace characters, quotation marks, "
+            "semicolons, or SQL comments."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            Book.objects.annotate(**{crafted_alias: Value(1)})
+
+    def test_alias_forbidden_chars(self):
+        tests = [
+            'al"ias',
+            "a'lias",
+            "ali`as",
+            "alia s",
+            "alias\t",
+            "ali\nas",
+            "alias--",
+            "ali/*as",
+            "alias*/",
+            "alias;",
+            # [] are used by MSSQL.
+            "alias[",
+            "alias]",
+        ]
+        msg = (
+            "Column aliases cannot contain whitespace characters, quotation marks, "
+            "semicolons, or SQL comments."
+        )
+        for crafted_alias in tests:
+            with self.subTest(crafted_alias):
+                with self.assertRaisesMessage(ValueError, msg):
+                    Book.objects.annotate(**{crafted_alias: Value(1)})
+
 
 class AliasTests(TestCase):
     @classmethod
@@ -1339,3 +1373,12 @@ def test_values_alias(self):
             with self.subTest(operation=operation):
                 with self.assertRaisesMessage(FieldError, msg):
                     getattr(qs, operation)("rating_alias")
+
+    def test_alias_sql_injection(self):
+        crafted_alias = """injected_name" from "annotations_book"; --"""
+        msg = (
+            "Column aliases cannot contain whitespace characters, quotation marks, "
+            "semicolons, or SQL comments."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            Book.objects.alias(**{crafted_alias: Value(1)})
diff --git a/tests/expressions/test_queryset_values.py b/tests/expressions/test_queryset_values.py
@@ -34,6 +34,15 @@ def test_values_expression(self):
             [{"salary": 10}, {"salary": 20}, {"salary": 30}],
         )
 
+    def test_values_expression_alias_sql_injection(self):
+        crafted_alias = """injected_name" from "expressions_company"; --"""
+        msg = (
+            "Column aliases cannot contain whitespace characters, quotation marks, "
+            "semicolons, or SQL comments."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            Company.objects.values(**{crafted_alias: F("ceo__salary")})
+
     def test_values_expression_group_by(self):
         # values() applies annotate() first, so values selected are grouped by
         # id, not firstname.
diff --git a/tests/queries/tests.py b/tests/queries/tests.py
@@ -1898,6 +1898,15 @@ def test_extra_select_literal_percent_s(self):
             Note.objects.extra(select={"foo": "'bar %%s'"})[0].foo, "bar %s"
         )
 
+    def test_extra_select_alias_sql_injection(self):
+        crafted_alias = """injected_name" from "queries_note"; --"""
+        msg = (
+            "Column aliases cannot contain whitespace characters, quotation marks, "
+            "semicolons, or SQL comments."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            Note.objects.extra(select={crafted_alias: "1"})
+
     def test_queryset_reuse(self):
         # Using querysets doesn't mutate aliases.
         authors = Author.objects.filter(Q(name="a1") | Q(name="nonexistent"))
