Tenda N3 Wireless N150 Router - Authentication Bypass

# Exploit Title: Complete Authentication Bypass In Tenda N3 Wireless N150 Routers
# Date: 03-09-2015
# Software Link: http://tendacn.com/en/product/N150.html
# Exploit Author: Mandeep Jadon
# Contact: http://twitter.com/1337tr0lls
# Website: http://twitter.com/1337tr0lls
# CVE: CVE-2015-5995
# Category: Device


Description:

The router (AP) is using very poor authentication mechanism . It uses a
static cookie to verify the incoming authentication. After careful
inspection it was found that the cookie used were same for any number of
authentication by the Admin .

Thus the cookie can be easily forged and the admin account could be
compromised without supplying the credentials .

Proof Of Concept:

Inject the following cookie in the browser with the given values :

admin:language : en

Reload the page . You are logged into the admin account .

Video POC : https://www.youtube.com/watch?v=dvF-7KK0g6E

Mitigation :

Use: a secure authentication mechanism consisting of random , complex
cookies .

References :
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5995
https://www.kb.cert.org/vuls/id/630872