From 79d5b2c37f99bcfc8e86e8045557f0a0557f93c4 Mon Sep 17 00:00:00 2001
From: Wu Cheng-Han
Date: Sat, 26 Nov 2016 22:46:58 +0800
Subject: Fix slide might able to add unsafe attribute on section tag which
 cause XSS [Security Issue]

---
 public/js/render.js          | 1 +
 public/js/reveal-markdown.js | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 public/js/reveal-markdown.js

diff --git a/public/js/render.js b/public/js/render.js
index 559530b0..a61fc8fb 100644
--- a/public/js/render.js
+++ b/public/js/render.js
@@ -1,5 +1,6 @@
 // allow some attributes
 var whiteListAttr = ['id', 'class', 'style'];
+window.whiteListAttr = whiteListAttr;
 // allow link starts with '.', '/' and custom protocol with '://'
 var linkRegex = /^([\w|-]+:\/\/)|^([\.|\/])+/;
 // allow data uri, from https://gist.github.com/bgrins/6194623
diff --git a/public/js/reveal-markdown.js b/public/js/reveal-markdown.js
old mode 100644
new mode 100755
index ca22e09c..3c3e1f5b
--- a/public/js/reveal-markdown.js
+++ b/public/js/reveal-markdown.js
@@ -286,7 +286,10 @@
 			nodeValue = nodeValue.substring( 0, matches.index ) + nodeValue.substring( mardownClassesInElementsRegex.lastIndex );
 			node.nodeValue = nodeValue;
 			while( matchesClass = mardownClassRegex.exec( classes ) ) {
-				elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
+				var name = matchesClass[1];
+				var value = matchesClass[2];
+				if (name.substr(0, 5) === 'data-' || whiteListAttr.indexOf(name) !== -1)
+					elementTarget.setAttribute( name, filterXSS.escapeAttrValue(value) );
 			}
 			return true;
 		}
-- 
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