diff options
Diffstat (limited to 'system/core')
| -rwxr-xr-x | system/core/Security.php | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/system/core/Security.php b/system/core/Security.php index 974e2e428..c82b69ff9 100755 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -95,13 +95,14 @@ class CI_Security { * * @var array */ - protected $_never_allowed_regex = array( + protected $_never_allowed_regex = array( 'javascript\s*:', 'expression\s*(\(|&\#40;)', // CSS and IE 'vbscript\s*:', // IE, surprise! - 'Redirect\s+302' + 'Redirect\s+302', + "([\"'])?data\s*:[^\\1]*?base64[^\\1]*?,[^\\1]*?\\1?" ); - + /** * Initialize security class */ @@ -365,10 +366,11 @@ class CI_Security { * These words are compacted back to their correct state. */ $words = array( - 'javascript', 'expression', 'vbscript', 'script', + 'javascript', 'expression', 'vbscript', 'script', 'base64', 'applet', 'alert', 'document', 'write', 'cookie', 'window' ); + foreach ($words as $word) { $word = implode('\s*', str_split($word)).'\s*'; @@ -605,10 +607,11 @@ class CI_Security { $attribs = array(); // find occurrences of illegal attribute strings without quotes - preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*([^\s]*)/is', $str, $matches, PREG_SET_ORDER); + preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*([^\s>]*)/is', $str, $matches, PREG_SET_ORDER); foreach ($matches as $attr) { + $attribs[] = preg_quote($attr[0], '/'); } @@ -623,7 +626,7 @@ class CI_Security { // replace illegal attribute strings that are inside an html tag if (count($attribs) > 0) { - $str = preg_replace('/<(\/?[^><]+?)([^A-Za-z\-])('.implode('|', $attribs).')([\s><])([><]*)/i', '<$1$2$4$5', $str, -1, $count); + $str = preg_replace("/<(\/?[^><]+?)([^A-Za-z<>\-])(.*?)(".implode('|', $attribs).")(.*?)([\s><])([><]*)/i", '<$1 $3$5$6$7', $str, -1, $count); } } while ($count); @@ -664,7 +667,7 @@ class CI_Security { protected function _js_link_removal($match) { return str_replace($match[1], - preg_replace('#href=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si', + preg_replace('#href=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|<script|<xss|data\s*:)#si', '', $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1])) ), @@ -804,7 +807,7 @@ class CI_Security { foreach ($this->_never_allowed_regex as $regex) { - $str = preg_replace('#'.$regex.'#i', '[removed]', $str); + $str = preg_replace('#'.$regex.'#is', '[removed]', $str); } return $str; @@ -841,4 +844,4 @@ class CI_Security { } /* End of file Security.php */ -/* Location: ./system/core/Security.php */
\ No newline at end of file +/* Location: ./system/core/Security.php */ |