hik-connect.com / ezvizlife.com Authentication Bypass

`There is a full write up of this bug here: https://medium.com/@evstykas/hackvision-8f50924e56d <https://medium.com/@evstykas/hackvision-8f50924e56d>  
  
Vulnerability Security Advisory < 20180424 >  
=======================================================================  
title: No validation on cookie values   
product: hik-connect.com and ezvizlife.com  
vulnerable version: latest  
fixed version: fixed  
CVE number: -  
impact: critical  
found: 2018-04-19  
by: Vangelis Stykas & George Lavdanis  
  
=======================================================================  
  
Vendor description:  
-------------------  
  
  
Vulnerability overview/description:  
-----------------------------------  
1) No validation on cookie values   
  
Both cloud services (hik-connect.com and ezvizlife.com) rely on cookie value AS_UserID to authenticate the user.Directly changing the value to another valid User id will result in hijacking that user session and be access its cameras/DVRS and change its password and/or email and phone.As the user id is not an incremental number but a hash we will need a way of finding out valid User ids.  
In order to do that we can use the https://xxx.ezvizlife.com/friend/queryByMobile.json or endpoint AFTER making that user a friend and get his userId.  
That endpoints has a GET parameter (mobile) that will check for a user with username, email or phone number.  
After that changing the cookie value to his user id will result in having us logged in as that user.  
  
  
Proof of concept:  
-----------------  
1) No validation on cookie values:  
  
### Details  
* Attack Vector: HTTP GET  
* Prerequisites: None  
* CWE: CWE-784: Reliance on Cookies without Validation and Integrity Checking in a Security Decision  
* Technical Impact: Login as any user with no password required  
* Vulnerable query URL: /  
* Vulnerable Cookie parameter: AS_UserId  
  
  
  
  
  
  
Vulnerable / tested versions:  
-----------------------------  
Http://www.hik-connect.com/ (and all geographically distributed servers)  
  
  
Vendor contact timeline:  
------------------------  
2018-04-21: Sent initial report to Hikvision   
  
  
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