mirror of
https://github.com/openembedded/meta-openembedded.git
synced 2026-01-27 12:01:38 +01:00
e2da1298ac
Reference:
https://nvd.nist.gov/vuln/detail/CVE-2025-32873
Upstream-patch:
9cd8028f3e/
Signed-off-by: Saravanan <saravanan.kadambathursubramaniyam@windriver.com>
Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
111 lines
4.2 KiB
Diff
111 lines
4.2 KiB
Diff
From 9cd8028f3e38dca8e51c1388f474eecbe7d6ca3c Mon Sep 17 00:00:00 2001
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From: Marc Deslauriers <marc.deslauriers@ubuntu.com>
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Date: Wed, 30 Apr 2025 10:34:27 -0400
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Subject: [PATCH] Fixed CVE-2025-32873 -- Mitigated potential DoS in
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strip_tags().
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Thanks to Elias Myllymaki for the report, and Shai Berger and Jake
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Howard for the reviews.
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Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>
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Backport of 9f3419b from main.
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CVE: CVE-2025-32873
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Upstream-Status: Backport
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https://github.com/django/django/commit/9cd8028f3e38dca8e51c1388f474eecbe7d6ca3c/
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Signed-off-by: Saravanan <saravanan.kadambathursubramaniyam@windriver.com>
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---
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django/utils/html.py | 6 ++++++
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docs/releases/3.2.25.txt | 11 +++++++++++
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tests/utils_tests/test_html.py | 15 ++++++++++++++-
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3 files changed, 31 insertions(+), 1 deletion(-)
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diff --git a/django/utils/html.py b/django/utils/html.py
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index 5887bf1..1a3033e 100644
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--- a/django/utils/html.py
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+++ b/django/utils/html.py
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@@ -33,6 +33,9 @@ simple_url_2_re = _lazy_re_compile(
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MAX_URL_LENGTH = 2048
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MAX_STRIP_TAGS_DEPTH = 50
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+# HTML tag that opens but has no closing ">" after 1k+ chars.
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+long_open_tag_without_closing_re = _lazy_re_compile(r"<[a-zA-Z][^>]{1000,}")
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+
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@keep_lazy(str, SafeString)
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def escape(text):
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@@ -184,6 +187,9 @@ def _strip_once(value):
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def strip_tags(value):
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"""Return the given HTML with all tags stripped."""
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value = str(value)
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+ for long_open_tag in long_open_tag_without_closing_re.finditer(value):
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+ if long_open_tag.group().count("<") >= MAX_STRIP_TAGS_DEPTH:
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+ raise SuspiciousOperation
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# Note: in typical case this loop executes _strip_once twice (the second
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# execution does not remove any more tags).
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strip_tags_depth = 0
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diff --git a/docs/releases/3.2.25.txt b/docs/releases/3.2.25.txt
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index f21bb47..2e113cc 100644
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--- a/docs/releases/3.2.25.txt
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+++ b/docs/releases/3.2.25.txt
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@@ -82,6 +82,17 @@ Remember that absolutely NO guarantee is provided about the results of
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``strip_tags()`` call without escaping it first, for example with
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:func:`django.utils.html.escape`.
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+CVE-2025-32873: Denial-of-service possibility in ``strip_tags()``
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+=================================================================
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+
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+:func:`~django.utils.html.strip_tags` would be slow to evaluate certain inputs
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+containing large sequences of incomplete HTML tags. This function is used to
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+implement the :tfilter:`striptags` template filter, which was thus also
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+vulnerable.
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+
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+:func:`~django.utils.html.strip_tags` now raises a :exc:`.SuspiciousOperation`
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+exception if it encounters an unusually large number of unclosed opening tags.
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+
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Bugfixes
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========
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diff --git a/tests/utils_tests/test_html.py b/tests/utils_tests/test_html.py
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index 231f5d8..5c2de01 100644
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--- a/tests/utils_tests/test_html.py
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+++ b/tests/utils_tests/test_html.py
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@@ -94,17 +94,30 @@ class TestUtilsHtml(SimpleTestCase):
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('><!' + ('&' * 16000) + 'D', '><!' + ('&' * 16000) + 'D'),
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('X<<<<br>br>br>br>X', 'XX'),
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("<" * 50 + "a>" * 50, ""),
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+ (">" + "<a" * 500 + "a", ">" + "<a" * 500 + "a"),
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+ ("<a" * 49 + "a" * 951, "<a" * 49 + "a" * 951),
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+ ("<" + "a" * 1_002, "<" + "a" * 1_002),
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)
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for value, output in items:
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with self.subTest(value=value, output=output):
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self.check_output(strip_tags, value, output)
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self.check_output(strip_tags, lazystr(value), output)
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- def test_strip_tags_suspicious_operation(self):
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+ def test_strip_tags_suspicious_operation_max_depth(self):
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value = "<" * 51 + "a>" * 51, "<a>"
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with self.assertRaises(SuspiciousOperation):
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strip_tags(value)
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+ def test_strip_tags_suspicious_operation_large_open_tags(self):
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+ items = [
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+ ">" + "<a" * 501,
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+ "<a" * 50 + "a" * 950,
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+ ]
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+ for value in items:
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+ with self.subTest(value=value):
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+ with self.assertRaises(SuspiciousOperation):
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+ strip_tags(value)
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+
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def test_strip_tags_files(self):
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# Test with more lengthy content (also catching performance regressions)
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for filename in ('strip_tags1.html', 'strip_tags2.txt'):
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--
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2.40.0
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