F2blog XMLRPC 上传任意文件漏洞

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']}");
    
    $filenum=@fopen("attachments/{$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);
}

$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');

$methodName=parse_get($rawdata, 'methodName', true);
if (!@in_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('.', '_', $met

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