From 9144d0fc5d5249cc4d81287ee79091806e6dde52 Mon Sep 17 00:00:00 2001
From: Gareth Simpson <gareth.simpson@zoodigital.com>
Date: Fri, 1 May 2020 19:31:21 +0100
Subject: [PATCH] Fix for issue 348 - incomplete tags with punctuation after as
 part of the tag name are a source of XSS

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from:
https://github.com/trentm/python-markdown2/commit/9144d0fc5d5249cc4d81287ee79091806e6dde52]
---
 lib/markdown2.py                           | 2 +-
 test/tm-cases/issue348_incomplete_tag.html | 1 +
 test/tm-cases/issue348_incomplete_tag.opts | 1 +
 test/tm-cases/issue348_incomplete_tag.text | 1 +
 4 files changed, 4 insertions(+), 1 deletion(-)
 create mode 100644 test/tm-cases/issue348_incomplete_tag.html
 create mode 100644 test/tm-cases/issue348_incomplete_tag.opts
 create mode 100644 test/tm-cases/issue348_incomplete_tag.text

diff --git a/lib/markdown2.py b/lib/markdown2.py
index 3a5d5d9..636bf07 100755
--- a/lib/markdown2.py
+++ b/lib/markdown2.py
@@ -2164,7 +2164,7 @@ def _encode_amps_and_angles(self, text):
         text = self._naked_gt_re.sub('&gt;', text)
         return text
 
-    _incomplete_tags_re = re.compile("<(/?\w+[\s/]+?)")
+    _incomplete_tags_re = re.compile("<(/?\w+?(?!://).?[\s/]+?)")
 
     def _encode_incomplete_tags(self, text):
         if self.safe_mode not in ("replace", "escape"):
diff --git a/test/tm-cases/issue348_incomplete_tag.html b/test/tm-cases/issue348_incomplete_tag.html
new file mode 100644
index 0000000..46059cc
--- /dev/null
+++ b/test/tm-cases/issue348_incomplete_tag.html
@@ -0,0 +1 @@
+<p>&lt;lol@/ //id="pwn"//onclick="alert(1)"//<strong>abc</strong></p>
diff --git a/test/tm-cases/issue348_incomplete_tag.opts b/test/tm-cases/issue348_incomplete_tag.opts
new file mode 100644
index 0000000..ad487c0
--- /dev/null
+++ b/test/tm-cases/issue348_incomplete_tag.opts
@@ -0,0 +1 @@
+{"safe_mode": "escape"}
diff --git a/test/tm-cases/issue348_incomplete_tag.text b/test/tm-cases/issue348_incomplete_tag.text
new file mode 100644
index 0000000..bb4a0de
--- /dev/null
+++ b/test/tm-cases/issue348_incomplete_tag.text
@@ -0,0 +1 @@
+<lol@/ //id="pwn"//onclick="alert(1)"//**abc**