diff options
| -rw-r--r-- | system/core/Security.php | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/system/core/Security.php b/system/core/Security.php index 4a69daa18..b9160a252 100644 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -371,11 +371,17 @@ class CI_Security { * * Note: Use rawurldecode() so it does not remove plus signs */ - do + if (stripos($str, '%') !== false) { - $str = rawurldecode($str); + do + { + $oldstr = $str; + $str = rawurldecode($str); + $str = preg_replace_callback('#%(?:\s*[0-9a-f]){2,}#i', array($this, '_urldecodespaces'), $str); + } + while ($oldstr !== $str); + unset($oldstr); } - while (preg_match('/%[0-9a-f]{2,}/i', $str)); /* * Convert character entities to ASCII @@ -466,7 +472,7 @@ class CI_Security { if (preg_match('/<a/i', $str)) { - $str = preg_replace_callback('#<a[^a-z0-9>]+([^>]*?)(?:>|$)#si', array($this, '_js_link_removal'), $str); + $str = preg_replace_callback('#<a(?:rea)?[^a-z0-9>]+([^>]*?)(?:>|$)#si', array($this, '_js_link_removal'), $str); } if (preg_match('/<img/i', $str)) @@ -775,6 +781,24 @@ class CI_Security { // ---------------------------------------------------------------- /** + * URL-decode taking spaces into account + * + * @see https://github.com/bcit-ci/CodeIgniter/issues/4877 + * @param array $matches + * @return string + */ + protected function _urldecodespaces($matches) + { + $input = $matches[0]; + $nospaces = preg_replace('#\s+#', '', $input); + return ($nospaces === $input) + ? $input + : rawurldecode($nospaces); + } + + // ---------------------------------------------------------------- + + /** * Compact Exploded Words * * Callback method for xss_clean() to remove whitespace from @@ -803,7 +827,7 @@ class CI_Security { protected function _sanitize_naughty_html($matches) { static $naughty_tags = array( - 'alert', 'prompt', 'confirm', 'applet', 'audio', 'basefont', 'base', 'behavior', 'bgsound', + 'alert', 'area', 'prompt', 'confirm', 'applet', 'audio', 'basefont', 'base', 'behavior', 'bgsound', 'blink', 'body', 'embed', 'expression', 'form', 'frameset', 'frame', 'head', 'html', 'ilayer', 'iframe', 'input', 'button', 'select', 'isindex', 'layer', 'link', 'meta', 'keygen', 'object', 'plaintext', 'style', 'script', 'textarea', 'title', 'math', 'video', 'svg', 'xml', 'xss' |