Posted By

nicolaspar on 12/27/06


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PHP - Sacar XSS


 / Published in: PHP
 

  1. function sacarXss($val) {
  2. $val = preg_replace('/([\x00-\x08][\x0b-\x0c][\x0e-\x20])/', '', $val);
  3. $search = 'abcdefghijklmnopqrstuvwxyz';
  4. $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  5. $search .= '1234567890!@#$%^&*()';
  6. $search .= '~`";:?+/={}[]-_|\'\\';
  7. for ($i = 0; $i < strlen($search); $i++) {
  8. $val = preg_replace('/(&#[x|X]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ;
  9. $val = preg_replace('/(&#0{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ;
  10. }
  11. $ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
  12. $ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
  13. $ra = array_merge($ra1, $ra2);
  14. $found = true;
  15. while ($found == true) {
  16. $val_before = $val;
  17. for ($i = 0; $i < sizeof($ra); $i++) {
  18. $pattern = '/';
  19. for ($j = 0; $j < strlen($ra[$i]); $j++) {
  20. if ($j > 0) {
  21. $pattern .= '(';
  22. $pattern .= '(&#[x|X]0{0,8}([9][a][b]);?)?';
  23. $pattern .= '|(&#0{0,8}([9][10][13]);?)?';
  24. $pattern .= ')?';
  25. }
  26. $pattern .= $ra[$i][$j];
  27. }
  28. $pattern .= '/i';
  29. $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2);
  30. $val = preg_replace($pattern, $replacement, $val);
  31. if ($val_before == $val) {
  32. $found = false;
  33. }
  34. }
  35. }
  36. return $val;
  37. }
  38. echo sacarXss("testeando javascript:alert('hola');");

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