Added function for escaping query strings and fixed several XSRF vulnerabilities.

1 files changed, 19 insertions, 0 deletions

diff --git a/engine/lib/output.php b/engine/lib/output.php
index 6172a5c8d..de4f911fb 100644
--- a/engine/lib/output.php
+++ b/engine/lib/output.php
@@ -421,6 +421,25 @@ function _elgg_html_decode($string) {
 }
 
 /**
+ * Prepares query string for output to prevent CSRF attacks.
+ * 
+ * @param string $string
+ * @return string
+ *
+ * @access private
+ */
+function _elgg_get_display_query($string) {
+	//encode <,>,&, quotes and characters above 127
+	if (function_exists('mb_convert_encoding')) {

+		$display_query = mb_convert_encoding($string, 'HTML-ENTITIES', 'UTF-8');

+	} else {

+		// if no mbstring extension, we just strip characters

+		$display_query = preg_replace("/[^\x01-\x7F]/", "", $string);

+	}

+	return htmlspecialchars($display_query, ENT_QUOTES, 'UTF-8', false);
+}
+
+/**
  * Unit tests for Output
  *
  * @param string  $hook   unit_test