diff options
Diffstat (limited to 'system/core/Security.php')
| -rw-r--r-- | system/core/Security.php | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/system/core/Security.php b/system/core/Security.php index 3bf626635..5ae8e653c 100644 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -329,7 +329,7 @@ class CI_Security { * these are the ones that will pose security problems. */ $str = preg_replace_callback("/[a-z]+=([\'\"]).*?\\1/si", array($this, '_convert_attribute'), $str); - $str = preg_replace_callback('/<\w+.*?(?=>|<|$)/si', array($this, '_decode_entity'), $str); + $str = preg_replace_callback('/<\w+.*/si', array($this, '_decode_entity'), $str); // Remove Invisible Characters Again! $str = remove_invisible_characters($str); @@ -526,9 +526,17 @@ class CI_Security { $charset = config_item('charset'); } - $str = html_entity_decode($str, ENT_COMPAT, $charset); - $str = preg_replace('~&#x(0*[0-9a-f]{2,5})~ei', 'chr(hexdec("\\1"))', $str); - return preg_replace('~&#([0-9]{2,4})~e', 'chr(\\1)', $str); + do + { + $matches = $matches1 = 0; + + $str = html_entity_decode($str, ENT_COMPAT, $charset); + $str = preg_replace('~&#x(0*[0-9a-f]{2,5})~ei', 'chr(hexdec("\\1"))', $str, -1, $matches); + $str = preg_replace('~&#([0-9]{2,4})~e', 'chr(\\1)', $str, -1, $matches1); + } + while($matches OR $matches1); + + return $str; } // -------------------------------------------------------------------- @@ -642,17 +650,16 @@ class CI_Security { $count = 0; $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); + // find occurrences of illegal attribute strings with quotes (042 and 047 are octal quotes) + preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*(\042|\047)([^\\2]*?)(\\2)/is', $str, $matches, PREG_SET_ORDER); foreach ($matches as $attr) { - $attribs[] = preg_quote($attr[0], '/'); } - // find occurrences of illegal attribute strings with quotes (042 and 047 are octal quotes) - preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*(\042|\047)([^\\2]*?)(\\2)/is', $str, $matches, PREG_SET_ORDER); + // find occurrences of illegal attribute strings without quotes + preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*([^\s>]*)/is', $str, $matches, PREG_SET_ORDER); foreach ($matches as $attr) { @@ -662,7 +669,7 @@ class CI_Security { // replace illegal attribute strings that are inside an html tag if (count($attribs) > 0) { - $str = preg_replace('/<(\/?[^><]+?)([^A-Za-z<>\-])(.*?)('.implode('|', $attribs).')(.*?)([\s><])([><]*)/i', '<$1 $3$5$6$7', $str, -1, $count); + $str = preg_replace('/(<?)(\/?[^><]+?)([^A-Za-z<>\-])(.*?)('.implode('|', $attribs).')(.*?)([\s><]?)([><]*)/i', '$1$2 $4$6$7$8', $str, -1, $count); } } while ($count); |