From 197203727417a03d87053a47e5aa5175a76e3e0b Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Thu, 17 Oct 2013 04:24:53 -0400
Subject: [PATCH] Fix vulnerability in handling _session argument of utils/save-prefs (#1489382)
---
program/include/main.inc | 105 +++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 91 insertions(+), 14 deletions(-)
diff --git a/program/include/main.inc b/program/include/main.inc
index 7147649..7a3e1c0 100644
--- a/program/include/main.inc
+++ b/program/include/main.inc
@@ -169,14 +169,16 @@
// get target timestamp
$ts = get_offset_time($rcmail->config->get('message_cache_lifetime', '30d'), -1);
- $db->query("DELETE FROM ".get_table_name('cache_messages')
+ if ($rcmail->config->get('messages_cache') || $rcmail->config->get('enable_caching')) {
+ $db->query("DELETE FROM ".get_table_name('cache_messages')
." WHERE changed < " . $db->fromunixtime($ts));
- $db->query("DELETE FROM ".get_table_name('cache_index')
+ $db->query("DELETE FROM ".get_table_name('cache_index')
." WHERE changed < " . $db->fromunixtime($ts));
- $db->query("DELETE FROM ".get_table_name('cache_thread')
+ $db->query("DELETE FROM ".get_table_name('cache_thread')
." WHERE changed < " . $db->fromunixtime($ts));
+ }
$db->query("DELETE FROM ".get_table_name('cache')
." WHERE created < " . $db->fromunixtime($ts));
@@ -883,23 +885,37 @@
* @param string Container ID to use as prefix
* @return string Modified CSS source
*/
-function rcmail_mod_css_styles($source, $container_id)
+function rcmail_mod_css_styles($source, $container_id, $allow_remote=false)
{
$last_pos = 0;
$replacements = new rcube_string_replacer;
// ignore the whole block if evil styles are detected
- $stripped = preg_replace('/[^a-z\(:;]/', '', rcmail_xss_entity_decode($source));
- if (preg_match('/expression|behavior|url\(|import[^a]/', $stripped))
+ $source = rcmail_xss_entity_decode($source);
+ $stripped = preg_replace('/[^a-z\(:;]/i', '', $source);
+ $evilexpr = 'expression|behavior|javascript:|import[^a]' . (!$allow_remote ? '|url\(' : '');
+ if (preg_match("/$evilexpr/i", $stripped))
return '/* evil! */';
- // remove css comments (sometimes used for some ugly hacks)
- $source = preg_replace('!/\*(.+)\*/!Ums', '', $source);
-
// cut out all contents between { and }
- while (($pos = strpos($source, '{', $last_pos)) && ($pos2 = strpos($source, '}', $pos)))
- {
- $key = $replacements->add(substr($source, $pos+1, $pos2-($pos+1)));
+ while (($pos = strpos($source, '{', $last_pos)) && ($pos2 = strpos($source, '}', $pos))) {
+ $styles = substr($source, $pos+1, $pos2-($pos+1));
+
+ // check every line of a style block...
+ if ($allow_remote) {
+ $a_styles = preg_split('/;[\r\n]*/', $styles, -1, PREG_SPLIT_NO_EMPTY);
+ foreach ($a_styles as $line) {
+ $stripped = preg_replace('/[^a-z\(:;]/i', '', $line);
+ // ... and only allow strict url() values
+ if (stripos($stripped, 'url(') && !preg_match('!url\s*\([ "\'](https?:)//[a-z0-9/._+-]+["\' ]\)!Uims', $line)) {
+ $a_styles = array('/* evil! */');
+ break;
+ }
+ }
+ $styles = join(";\n", $a_styles);
+ }
+
+ $key = $replacements->add($styles);
$source = substr($source, 0, $pos+1) . $replacements->get_replacement($key) . substr($source, $pos2, strlen($source)-$pos2);
$last_pos = $pos+2;
}
@@ -937,7 +953,7 @@
{
$out = html_entity_decode(html_entity_decode($content));
$out = preg_replace_callback('/\\\([0-9a-f]{4})/i', 'rcmail_xss_entity_decode_callback', $out);
- $out = preg_replace('#/\*.*\*/#Um', '', $out);
+ $out = preg_replace('#/\*.*\*/#Ums', '', $out);
return $out;
}
@@ -2045,7 +2061,68 @@
public function callback($matches)
{
- return $matches[1] . '="' . make_absolute_url($matches[3], $this->base_url) . '"';
+ return $matches[1] . '="' . self::absolute_url($matches[3], $this->base_url) . '"';
+ }
+
+ public function replace($body)
+ {
+ return preg_replace_callback(array(
+ '/(src|background|href)=(["\']?)([^"\'\s]+)(\2|\s|>)/Ui',
+ '/(url\s*\()(["\']?)([^"\'\)\s]+)(\2)\)/Ui',
+ ),
+ array($this, 'callback'), $body);
+ }
+
+ /**
+ * Convert paths like ../xxx to an absolute path using a base url
+ *
+ * @param string $path Relative path
+ * @param string $base_url Base URL
+ *
+ * @return string Absolute URL
+ */
+ public static function absolute_url($path, $base_url)
+ {
+ $host_url = $base_url;
+ $abs_path = $path;
+
+ // check if path is an absolute URL
+ if (preg_match('/^[fhtps]+:\/\//', $path)) {
+ return $path;
+ }
+
+ // check if path is a content-id scheme
+ if (strpos($path, 'cid:') === 0) {
+ return $path;
+ }
+
+ // cut base_url to the last directory
+ if (strrpos($base_url, '/') > 7) {
+ $host_url = substr($base_url, 0, strpos($base_url, '/', 7));
+ $base_url = substr($base_url, 0, strrpos($base_url, '/'));
+ }
+
+ // $path is absolute
+ if ($path[0] == '/') {
+ $abs_path = $host_url.$path;
+ }
+ else {
+ // strip './' because its the same as ''
+ $path = preg_replace('/^\.\//', '', $path);
+
+ if (preg_match_all('/\.\.\//', $path, $matches, PREG_SET_ORDER)) {
+ foreach ($matches as $a_match) {
+ if (strrpos($base_url, '/')) {
+ $base_url = substr($base_url, 0, strrpos($base_url, '/'));
+ }
+ $path = substr($path, 3);
+ }
+ }
+
+ $abs_path = $base_url.'/'.$path;
+ }
+
+ return $abs_path;
}
}
--
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