剛從官方下載的最新版：F2blog-v1.2_build_03.01_full 存在漏洞文件：xmlrpc.php，
影響：可上傳任意文件到服務(wù)器。
原理：get_http_raw_post_data()是獲取最原始的傳遞過來的數(shù)據(jù)，也是說不會(huì)因?yàn)镻HP環(huán)境的magic為on的影響。
而他在check_user_pw的時(shí)候，并沒有過濾，結(jié)合后面的上傳沒有做后綴判斷，所有可以直接導(dǎo)致上傳任意文件到服務(wù)器。 簡(jiǎn)單分析：
function metaWeblog_newMediaObject ($values) { //2007-02-01 add support for uploading files
global $settingInfo,$DMC, $DBPrefix,$defualtcategoryid;
//此處本是判斷用戶是否登錄的，但是下面沒有做檢查，僅僅在這里返回了用戶是否登錄的一個(gè)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,$writefilecontent);
//并沒有判斷文件是否安全，直接寫入。
fclose($filenum);
}
$xml_content=make_xml_piece ("struct", array('url'=>"{$settingInfo['blogurl']}/attachments/{$struct['name']}"));
$body_xml=xml_generate($xml_content);
send_response ($body_xml);
}
本來說到這里都?jí)蛎靼琢?，下面就再把利用方法寫下吧?br /> 定義的方法數(shù)組：
$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');
方法調(diào)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的來源：
$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 $raw data is not set at all
} 漏洞修補(bǔ)，簡(jiǎn)單點(diǎn)的，判斷下用戶是否有上傳附件的權(quán)限。其他的自己發(fā)揮吧。
既然費(fèi)了這么多話，那就順便附上一個(gè)安全點(diǎn)的方法吧：
function metaWeblog_newMediaObject ($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);
}
}
沒有加文件格式的判斷，有點(diǎn)麻煩了，懶得寫了。

最新評(píng)論