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@@ -563,4 +563,62 @@ if(!function_exists('httpGet')){ |
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curl_close($ch);
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return $result;
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}
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}
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if (!function_exists('RemoveXSS')) {
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function RemoveXSS($val)
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{
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// remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
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// this prevents some character re-spacing such as <java\0script>
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// note that you have to handle splits with \n, \r, and \t later since they *are* allowed in some inputs
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$val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val);
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// straight replacements, the user should never need these since they're normal characters
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// this prevents like <IMG SRC=@avascript:alert('XSS')>
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$search = 'abcdefghijklmnopqrstuvwxyz';
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$search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$search .= '1234567890!@#$%^&*()';
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$search .= '~`";:?+/={}[]-_|\'\\';
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for ($i = 0; $i < strlen($search); $i++) {
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// ;? matches the ;, which is optional
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// 0{0,7} matches any padded zeros, which are optional and go up to 8 chars
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// @ @ search for the hex values
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$val = preg_replace('/(&#[xX]0{0,8}' . dechex(ord($search[$i])) . ';?)/i', $search[$i], $val); // with a ;
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// @ @ 0{0,7} matches '0' zero to seven times
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$val = preg_replace('/(�{0,8}' . ord($search[$i]) . ';?)/', $search[$i], $val); // with a ;
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}
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// now the only remaining whitespace attacks are \t, \n, and \r
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$ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
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$ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
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$ra = array_merge($ra1, $ra2);
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$found = true; // keep replacing as long as the previous round replaced something
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while ($found == true) {
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$val_before = $val;
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for ($i = 0; $i < sizeof($ra); $i++) {
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$pattern = '/';
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for ($j = 0; $j < strlen($ra[$i]); $j++) {
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if ($j > 0) {
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$pattern .= '(';
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$pattern .= '(&#[xX]0{0,8}([9ab]);)';
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$pattern .= '|';
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$pattern .= '|(�{0,8}([9|10|13]);)';
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$pattern .= ')*';
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}
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$pattern .= $ra[$i][$j];
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}
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$pattern .= '/i';
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$replacement = substr($ra[$i], 0, 2) . '<x>' . substr($ra[$i], 2); // add in <> to nerf the tag
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$val = preg_replace($pattern, $replacement, $val); // filter out the hex tags
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if ($val_before == $val) {
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// no replacements were made, so exit the loop
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$found = false;
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}
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}
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}
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return $val;
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}
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} |
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\ No newline at end of file |
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