File CVE-2024-41989.patch of Package python-Django.35187
From 0521744d21a7854e849336af1e3a3aad44cee017 Mon Sep 17 00:00:00 2001
From: Sarah Boyce <42296566+sarahboyce@users.noreply.github.com>
Date: Fri, 12 Jul 2024 11:38:34 +0200
Subject: [PATCH 1/4] [4.2.x] Fixed CVE-2024-41989 -- Prevented excessive
memory consumption in floatformat.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Thanks Elias Myllymäki for the report.
Co-authored-by: Shai Berger <shai@platonix.com>
---
django/template/defaultfilters.py | 13 +++++++++++++
.../filter_tests/test_floatformat.py | 17 +++++++++++++++++
3 files changed, 39 insertions(+)
Index: Django-2.0.7/django/template/defaultfilters.py
===================================================================
--- Django-2.0.7.orig/django/template/defaultfilters.py
+++ Django-2.0.7/django/template/defaultfilters.py
@@ -127,6 +127,19 @@ def floatformat(text, arg=-1):
except ValueError:
return input_val
+ _, digits, exponent = d.as_tuple()
+ try:
+ number_of_digits_and_exponent_sum = len(digits) + abs(exponent)
+ except TypeError:
+ # Exponent values can be "F", "n", "N".
+ number_of_digits_and_exponent_sum = 0
+
+ # Values with more than 200 digits, or with a large exponent, are returned "as is"
+ # to avoid high memory consumption and potential denial-of-service attacks.
+ # The cut-off of 200 is consistent with django.utils.numberformat.floatformat().
+ if number_of_digits_and_exponent_sum > 200:
+ return input_val
+
try:
m = int(d) - d
except (ValueError, OverflowError, InvalidOperation):
Index: Django-2.0.7/tests/template_tests/filter_tests/test_floatformat.py
===================================================================
--- Django-2.0.7.orig/tests/template_tests/filter_tests/test_floatformat.py
+++ Django-2.0.7/tests/template_tests/filter_tests/test_floatformat.py
@@ -55,6 +55,7 @@ class FunctionTests(SimpleTestCase):
self.assertEqual(floatformat(1.5e-15, 20), '0.00000000000000150000')
self.assertEqual(floatformat(1.5e-15, -20), '0.00000000000000150000')
self.assertEqual(floatformat(1.00000000000000015, 16), '1.0000000000000002')
+ self.assertEqual(floatformat("1e199"), "1" + "0" * 199)
def test_zero_values(self):
self.assertEqual(floatformat(0, 6), '0.000000')
@@ -68,6 +69,22 @@ class FunctionTests(SimpleTestCase):
self.assertEqual(floatformat(pos_inf), 'inf')
self.assertEqual(floatformat(neg_inf), '-inf')
self.assertEqual(floatformat(pos_inf / pos_inf), 'nan')
+ self.assertEqual(floatformat("inf"), "inf")
+ self.assertEqual(floatformat("NaN"), "NaN")
+
+ def test_too_many_digits_to_render(self):
+ cases = [
+ "1e200",
+ "1E200",
+ "1E10000000000000000",
+ "-1E10000000000000000",
+ "1e10000000000000000",
+ "-1e10000000000000000",
+ "1" + "0" * 1_000_000,
+ ]
+ for value in cases:
+ with self.subTest(value=value):
+ self.assertEqual(floatformat(value), value)
def test_float_dunder_method(self):
class FloatWrapper:
