Fix path traversal vulnerability in setting a skin (#1490620)

Aleksander Machniak

2015-12-22 89a5dcb946fb34d39617b52572d8e9fe90d10617

 program/include/rcmail_output_html.php

@@ -225,6 +225,17 @@
     */
    public function set_skin($skin)
    {
        // Sanity check to prevent from path traversal vulnerability (#1490620)
        if (strpos($skin, '/') !== false || strpos($skin, "\\") !== false) {
            rcube::raise_error(array(
                    'file'    => __FILE__,
                    'line'    => __LINE__,
                    'message' => 'Invalid skin name'
                ), true, false);

            return false;
        }

        $valid = false;
        $path  = RCUBE_INSTALL_PATH . 'skins/';