OverTheWire - Bandit - Level 16 → Level 17

Connect to the server using the following credentials:

Server: bandit.labs.overthewire.org
Port: 2220
Username: bandit16
Password: cluFn7wTiGryunymYOu4RcffSxQluehd

Level Goal is:

The credentials for the next level can be retrieved by submitting the password of the current level to a port on localhost in the range 31000 to 32000. First find out which of these ports have a server listening on them. Then find out which of those speak SSL and which don’t. There is only 1 server that will give the next credentials, the others will simply send back to you whatever you send to it.

First, perform a nmap scan to find the open ports:

bandit16@bandit:~$ nmap -sV -p31000-32000 localhost

Starting Nmap 7.40 ( https://nmap.org ) at 2019-01-01 12:31 CET
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00019s latency).
Not shown: 999 closed ports
PORT      STATE SERVICE     VERSION
31518/tcp open  ssl/echo
31790/tcp open  ssl/unknown
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port31790-TCP:V=7.40%T=SSL%I=7%D=1/1%Time=5C2B4FA1%P=x86_64-pc-linux-gn
SF:u%r(GenericLines,31,"Wrong!\x20Please\x20enter\x20the\x20correct\x20cur
SF:rent\x20password\n")%r(GetRequest,31,"Wrong!\x20Please\x20enter\x20the\
SF:x20correct\x20current\x20password\n")%r(HTTPOptions,31,"Wrong!\x20Pleas
SF:e\x20enter\x20the\x20correct\x20current\x20password\n")%r(RTSPRequest,3
SF:1,"Wrong!\x20Please\x20enter\x20the\x20correct\x20current\x20password\n
SF:")%r(Help,31,"Wrong!\x20Please\x20enter\x20the\x20correct\x20current\x2
SF:0password\n")%r(SSLSessionReq,31,"Wrong!\x20Please\x20enter\x20the\x20c
SF:orrect\x20current\x20password\n")%r(TLSSessionReq,31,"Wrong!\x20Please\
SF:x20enter\x20the\x20correct\x20current\x20password\n")%r(Kerberos,31,"Wr
SF:ong!\x20Please\x20enter\x20the\x20correct\x20current\x20password\n")%r(
SF:FourOhFourRequest,31,"Wrong!\x20Please\x20enter\x20the\x20correct\x20cu
SF:rrent\x20password\n")%r(LPDString,31,"Wrong!\x20Please\x20enter\x20the\
SF:x20correct\x20current\x20password\n")%r(LDAPSearchReq,31,"Wrong!\x20Ple
SF:ase\x20enter\x20the\x20correct\x20current\x20password\n")%r(SIPOptions,
SF:31,"Wrong!\x20Please\x20enter\x20the\x20correct\x20current\x20password\
SF:n");

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 88.30 seconds

There are two open ports, 31518 and 31790. The first one is the 'echo' port, the second one is the correct on. Connect to this port and then type in the password from the current level:

bandit16@bandit:~$ openssl s_client -connect localhost:31790
CONNECTED(00000003)
depth=0 CN = localhost
[...]

A private key is returned:

[...]
---
cluFn7wTiGryunymYOu4RcffSxQluehd
Correct!
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

closed
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