python3-django: Fix CVE-2024-53907

An issue was discovered in Django 5.1 before 5.1.4, 5.0 before 5.0.10, and 4.2
before 4.2.17. The strip_tags() method and striptags template filter are subject
to a potential denial-of-service attack via certain inputs containing large
sequences of nested incomplete HTML entities.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2024-53907

Upstream-patch:
790eb058b0

Signed-off-by: Soumya Sambu <soumya.sambu@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-python/recipes-devtools/python/python3-django/CVE-2024-53907.patch

@@ -0,0 +1,92 @@
+From 790eb058b0716c536a2f2e8d1c6d5079d776c22b Mon Sep 17 00:00:00 2001
+From: Sarah Boyce <42296566+sarahboyce@users.noreply.github.com>
+Date: Wed, 13 Nov 2024 15:06:23 +0100
+Subject: [PATCH] [4.2.x] Fixed CVE-2024-53907 -- Mitigated potential DoS in
+ strip_tags().
+
+Thanks to jiangniao for the report, and Shai Berger and Natalia Bidart
+for the reviews.
+
+CVE: CVE-2024-53907
+
+Upstream-Status: Backport [https://github.com/django/django/commit/790eb058b0716c536a2f2e8d1c6d5079d776c22b]
+
+Signed-off-by: Soumya Sambu <soumya.sambu@windriver.com>
+
+---
+ django/utils/html.py           | 10 ++++++++--
+ tests/utils_tests/test_html.py |  7 +++++++
+ 2 files changed, 15 insertions(+), 2 deletions(-)
+
+diff --git a/django/utils/html.py b/django/utils/html.py
+index 3cf1bfc..0d5ffd2 100644
+--- a/django/utils/html.py
++++ b/django/utils/html.py
+@@ -8,12 +8,14 @@ from urllib.parse import (
+     parse_qsl, quote, unquote, urlencode, urlsplit, urlunsplit,
+ )
+ 
++from django.core.exceptions import SuspiciousOperation
+ from django.utils.functional import Promise, keep_lazy, keep_lazy_text
+ from django.utils.http import RFC3986_GENDELIMS, RFC3986_SUBDELIMS
+ from django.utils.safestring import SafeData, SafeText, mark_safe
+ from django.utils.text import normalize_newlines
+ 
+ MAX_URL_LENGTH = 2048
++MAX_STRIP_TAGS_DEPTH = 50
+ 
+ # Configuration for urlize() function.
+ TRAILING_PUNCTUATION_CHARS = '.,:;!'
+@@ -185,15 +187,19 @@ def _strip_once(value):
+ @keep_lazy_text
+ def strip_tags(value):
+     """Return the given HTML with all tags stripped."""
+-    # Note: in typical case this loop executes _strip_once once. Loop condition
+-    # is redundant, but helps to reduce number of executions of _strip_once.
+     value = str(value)
++    # Note: in typical case this loop executes _strip_once twice (the second
++    # execution does not remove any more tags).
++    strip_tags_depth = 0
+     while '<' in value and '>' in value:
++        if strip_tags_depth >= MAX_STRIP_TAGS_DEPTH:
++            raise SuspiciousOperation
+         new_value = _strip_once(value)
+         if value.count('<') == new_value.count('<'):
+             # _strip_once wasn't able to detect more tags.
+             break
+         value = new_value
++        strip_tags_depth += 1
+     return value
+ 
+ 
+diff --git a/tests/utils_tests/test_html.py b/tests/utils_tests/test_html.py
+index 8fe2f24..2f412e1 100644
+--- a/tests/utils_tests/test_html.py
++++ b/tests/utils_tests/test_html.py
+@@ -1,6 +1,7 @@
+ import os
+ from datetime import datetime
+ 
++from django.core.exceptions import SuspiciousOperation
+ from django.test import SimpleTestCase
+ from django.utils.functional import lazystr
+ from django.utils.html import (
+@@ -90,12 +91,18 @@ class TestUtilsHtml(SimpleTestCase):
+             ('<script>alert()</script>&h', 'alert()h'),
+             ('><!' + ('&' * 16000) + 'D', '><!' + ('&' * 16000) + 'D'),
+             ('X<<<<br>br>br>br>X', 'XX'),
++            ("<" * 50 + "a>" * 50, ""),
+         )
+         for value, output in items:
+             with self.subTest(value=value, output=output):
+                 self.check_output(strip_tags, value, output)
+                 self.check_output(strip_tags, lazystr(value), output)
+ 
++    def test_strip_tags_suspicious_operation(self):
++        value = "<" * 51 + "a>" * 51, "<a>"
++        with self.assertRaises(SuspiciousOperation):
++            strip_tags(value)
++
+     def test_strip_tags_files(self):
+         # Test with more lengthy content (also catching performance regressions)
+         for filename in ('strip_tags1.html', 'strip_tags2.txt'):