In this article I will explain how we can solve a new problem with SameSite cookies that occurs when you update the chrome. SameSite has been introduced to check which cookies can be sent with cross-domain requests. Previously, browsers allowed the sending of cookies for which this attribute is not defined in standard cross-domain queries. This problem with SameSite affects your application that uses third party cookies in your Chrome browser.

Updates of the publication are available here:

What is a SameSite cookie?

Last year, in May 2019, Chrome announced plans to develop a secure cookie management model. Chrome promises to make surfing the internet safer and faster for users. Chrome strives for more transparency and simpler management for its users. Users need to know how they are being followed and who is following them. Today’s users are more concerned about their privacy, and with the growing number of potential cross-site attacks, Chrome is taking steps to protect its users.

As a result of these changes, advertisers, publishers and the company using cookies have the most influence. If you use a cookie and receive a SameSite cookie alert, prepare to update your application so that your users do not have an unpleasant experience.

On the fourth. In February 2020, Google Chrome will stop sending third party cookies in cross-site queries, unless these cookies are protected and marked with a standard IETF flag called SameSite.

What is a Crossite Request Forgery (CSRF)?

Cross-Site Request Spoofing (also known as CSRF) is a web vulnerability that allows an attacker to exploit users through session browsing or one-click attacks. For example, a hacker may mislead a user into clicking a certain button when the user clicks that button, and if that user is already logged on to a website that the hacker wants to visit, the hacker may view the previously authorized session and request a website that the user does not want to do. The website cannot identify hackers because the user is already authenticated.

The SameSite attribute allows a developer to define rules for sharing and accessing cookies.

You can set the following value for this SameSite attribute: Strict, sloppy or not.

Tight. Cookies with this setting are only accessible if you visit the domain from which they were originally set. In other words: The cookie sent to is completely blocked when sent from (i.e. is in the URL bar). Even if you click on a top-level link from a third party on your website, your browser will refuse to send a cookie. This option is most suitable for applications that require a high level of security, such as banks.
careless Unlike None, where cookies are always sent, Lax cookies are only sent for the same website request, e.g. Strict. However, Lax provides access to high-level navigation using a secure HTTP method such as HTTP GET. A cookie is not sent when asking questions via inter-domain mail or when loading the website in an inter-domain frame, but when you visit the website via the standard Top-Level link.
No Cookies work just as well in this setting as they do today. Cookies can be used on different websites. Note that you need both attributes – no and security – together. If you only specify without the cookie file, it will be rejected. Security ensures that your browser’s request is sent via a secure connection (HTTPS).

Fix SameSite cookie with PHP

You can fix the SameSite cookie error in PHP using the header function. Note: to set the SameSite=None cookie option, you will need to install PHP or upgrade to the latest version.  You can place a cookie in your header after the start of the session, as shown in the code below

session_start() ;
header(‘Set-Cookie: ‘ . session_name() . . session_id() . SameSite=not; safe’) ;

You can solve this problem with the code above.

SameSite cookie site repair in chrome

You can enable or disable this feature in your Chrome browser settings. You can perform the following steps to disable SameSite cookies in Chrome mode.

  1. Open the Chrome browser
  2. Type chrome://flags/ in the address bar, this will open the settings.
  3. Find the default SameSite cookies and select Enable.
  4. Searching for cookies without SameSite must be safe and select the Enable option.
  5. Reboot chrome

SameSite Cookie Correction with NGINX

You can set the SameSite flag in the NGINX configuration under the location section. To add a flag to Nginx, it is currently best to use the proxy_cookie_path directive in the configuration of Nginx.

Server {

# Your other server guidelines… ~

Location / {
proxy_cookie_path / / ; safe ; HttpOnly ; SameSite=None ;

Similar configurations can be implemented in most reverse proxies and load balancers.

Please note that not all browser versions support SameSite None and additional user checks are required.

If this message helps you solve your problem with SameSite, make sure you enjoy our Facebook page and also sign up for our YouTube link at the top of the thank you message.

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