F2blog XMLRPC 上传任意文件漏洞 's

By：Maple-x[B.C.T]
Site:http://www.neeao.com
Date:2008-5-27

刚从官方下载的最新版：F2blog-v1.2_build_03.01_full

存在漏洞文件：xmlrpc.php

function metaWeblog_newMediaObject ($values) { //2007-02-01 add support for uploading files global $settingInfo,$DMC, $DBPrefix,$defualtcategoryid; //此处本是判断用户是否登录的，但是下面没有做检查，仅仅在这里返回了用户是否登录的一个值。 $userdetail = check_user_pw ($values['username'], $values['password']);  $struct=$values['struct']; //writetofile ('text1.php', $struct['bits']); //debug only if ($struct['bits'] && $struct['name']) { $writefilecontent=base64_decode($struct['bits']); if (file_exists("attachments/{$struct['name']}")) @unlink("attachments/{$struct['name']}");  [email protected]("attachments/{$struct['name']}","wb"); if (!$filenum) { xml_error ("Sorry, uploading file ({$struct['name']}) failed."); } flock($filenum,LOCK_EX); fwrite($filenum,$writefilecontent); //并没有判断文件是否安全，直接写入。 fclose($filenum); } $xml_content=make_xml_piece ("struct", array('url'=>"{$settingInfo['blogurl']}/attachments/{$struct['name']}")); $body_xml=xml_generate($xml_content); send_response ($body_xml); }

本来说到这里都够明白了，下面就再把利用方法写下吧：
定义的方法数组：

$methodFamily=array('blogger.newPost', 'blogger.editPost', 'blogger.getUsersBlogs', 'blogger.getUserInfo', 'blogger.deletePost',   'blogger.getTemplate',   'blogger.setTemplate',   'metaWeblog.newPost', 'metaWeblog.editPost', 'metaWeblog.getPost', 'metaWeblog.newMediaObject', 'metaWeblog.getCategories', 'metaWeblog.getRecentPosts');

方法调用：

$methodName=parse_get($rawdata, 'methodName', true); if ([email protected]_array($methodName, $methodFamily)) xml_error ("Method ({$methodName}) is not availble."); $values=parse_get($rawdata, 'value');  $values=parse_walk_array($values, $methodName); //print_r($values); //For debug only //exit(); //Get default category, for those editors which don't support Categories $sql="select * from ".$DBPrefix."categories limit 0,1"; $arr_category=$DMC->fetchArray($DMC->query($sql)); $defualtcategoryid=$arr_category[id];  $methodName=str_replace('.', '_', $methodName); call_user_func ($methodName, $values);

$rawdata的来源：

$rawdata=get_http_raw_post_data(); //writetofile ("text4.xml", $rawdata); //For debug use //$rawdata=file_get_contents("text4.xml"); //For debug use  if (!$rawdata) die ("Sorry, don't visit this web!");  $stringType_o="i4|int|boolean|struct|string|double|base64|dateTime/.iso8601"; $stringType="(".$stringType_o.")";  $rawdata=str_replace("/r", '', $rawdata); $rawdata=str_replace("/n", '', $rawdata); $rawdata=str_replace("/t", '', $rawdata); $rawdata=str_replace("<![CDATA[", '', $rawdata); $rawdata=str_replace("]]>", '', $rawdata); //Stupid CDATA, I don't want it $rawdata=preg_replace("/<([^>]+?) //>/is", '<//1><///1>', $rawdata); //Self-closed tags //$rawdata=convert_utf8($rawdata);  $rawdata=preg_replace_callback("/<struct>(.+?)<//struct>/is", 'filter_struct', $rawdata); //Struct can be a trouble, use this to avoid values and names being parsed  get_http_raw_post_data()方法：  
function get_http_raw_post_data () { //Get http_raw_post_data global $HTTP_RAW_POST_DATA; if (isset($HTTP_RAW_POST_DATA)) { //Good, the server supports $HTTP_RAW_POST_DATA, then return it directly return trim($HTTP_RAW_POST_DATA); } elseif (PHP_OS>="4.3.0") { //PHP 4.3.0 and higher version supports another way to get it return readfromfile( 'php://input' ); } else return false; //Sorry, no way out, or $raw data is not set at all }

漏洞修补，简单点的，判断下用户是否有上传附件的权限。其他的自己发挥吧。
既然费了这么多话，那就顺便附上一个安全点的方法吧：

function metaWeblog_newMediaObject ($values) { //2008-05-27 edit by Neeao global $settingInfo,$DMC, $DBPrefix,$defualtcategoryid; $userdetail = check_user_pw ($values['username'], $values['password']);  $records=$DMC->fetchArray($DMC->query("SELECT * FROM `{$DBPrefix}logs` WHERE `id`='{$values['postid']}'")); if ($records['id']=='') xml_error ("Entry does not exist."); else { $struct=$values['struct']; //writetofile ('text1.php', $struct['bits']); //debug only if ($struct['bits'] && $struct['name']) { $writefilecontent=base64_decode($struct['bits']); if (file_exists("attachments/{$struct['name']}")) @unlink("attachments/{$struct['name']}");  [email protected]("attachments/{$struct['name']}","wb"); if (!$filenum) { xml_error ("Sorry, uploading file ({$struct['name']}) failed."); } flock($filenum,LOCK_EX); fwrite($filenum,$writefilecontent); fclose($filenum); } $xml_content=make_xml_piece ("struct", array('url'=>"{$settingInfo['blogurl']}/attachments/{$struct['name']}")); $body_xml=xml_generate($xml_content); send_response ($body_xml); } }

没有加文件格式的判断，有点麻烦了，懒得写了。