刚从官方下载的最新版：F2blog-v1.2_build_03.01_full
原理：get_http_raw_post_data()是获取最原始的传递过来的数据，也是说不会因为PHP环境的magic为on的影响。
而他在check_user_pw的时候，并没有过滤，结合后面的上传没有做后缀判断，所有可以直接导致上传任意文件到服务器。
简单分析：
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);
}
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 (!@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(\’.\’, \’_\’, $methodName);
call_user_func ($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\’]}");
$filenum=@fopen("attachments/{$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。
