From ac10b687041e12cb49a196acf79687d6f596114e Mon Sep 17 00:00:00 2001
From: Helio Cola <helio@tcard.io>
Date: Wed, 1 Nov 2023 23:18:17 -0400
Subject: [PATCH] Add tests for CVE-2023-31606

---
 spec/security/CVE-2023-31606_spec.rb | 49 ++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 spec/security/CVE-2023-31606_spec.rb

diff --git a/spec/security/CVE-2023-31606_spec.rb b/spec/security/CVE-2023-31606_spec.rb
new file mode 100644
index 00000000..562647cb
--- /dev/null
+++ b/spec/security/CVE-2023-31606_spec.rb
@@ -0,0 +1,49 @@
+# https://github.com/advisories/GHSA-qcm3-vfq5-wfr2
+# https://github.com/e23e/CVE-2023-31606#readme
+# https://github.com/jgarber/redcloth/issues/73
+# https://github.com/jgarber/redcloth/pull/75
+
+require 'redcloth'
+
+describe 'CVE-2023-31606' do
+
+  it 'process malicious html without delay' do
+    # INFO (Helio): inside RedCloth repo, running `$ bundle exec rspec .`, with the test below, I can't replicate,
+    # on my development machine, the time spent on this sample text.
+    # However, on the same development machine, when I run this test this code, in a test-redcloth-regexp.rb script, in a rails app
+    # with `gem 'RedCloth'` in it, I was able to get the results indicated in the issue (https://github.com/jgarber/redcloth/issues/73),
+    # by https://github.com/e23e
+    # Here are the outputs:
+    # hac@MBP tcard % time ruby test-redcloth-regexp.rb
+    # 0.158047
+    # ruby test-redcloth-regexp.rb  0.12s user 0.11s system 82% cpu 0.279 total
+    # hac@MBP tcard % time ruby test-redcloth-regexp.rb
+    # 18.457945
+    # ruby test-redcloth-regexp.rb  18.32s user 0.22s system 99% cpu 18.556 total
+    # hac@MBP tcard % cat !$
+    # cat test-redcloth-regexp.rb
+    # require 'RedCloth'
+    # text = '<A' + 'A' * (54773)
+    # t1 = Time.now
+    # text = RedCloth.new(text, [:sanitize_html]).to_html
+    # t2 = Time.now
+    # puts (t2-t1)
+    # hac@MBP tcard %
+
+    text = '<A' + 'A' * (54773)
+
+    t1 = Time.now
+    res = RedCloth.new(text, [:sanitize_html]).to_html
+    t2 = Time.now
+
+    expect(t2-t1).to be <= 3
+  end
+
+  it 'should keep the generated HTML the same' do
+    text = "<a href=https://example.com> Example </a>"
+    result = RedCloth.new(text, [:sanitize_html]).to_html
+
+    expect(result).to eq("<p><a href=\"https://example.com\"> Example </a></p>")
+  end
+
+end