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Date: Tue, 24 Apr 2018 16:33:49 +0300
From: Vangelis Stykas <>
Subject: [FD] Hikvision authentication vulnerability

There is a full write up of this bug here: <>

Vulnerability Security Advisory < 20180424 >
title: No validation on cookie values 
product: and
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 ( and 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 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:// (and all geographically distributed servers)

Vendor contact timeline:
2018-04-21: Sent initial report to Hikvision 

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