Are cookies accessible across subdomains?

Are cookies accessible across subdomains?

Browser cookies can be shared across subdomains if their domain flag is set to a common parent domain. Usually, hackers steal the session cookies by finding a subdomain takeover, RCE, XSS, or any other vulnerability that would expose the user’s cookie.

How do you store cookies securely?

When using cookies its important to remember to:

1. Limit the amount of sensitive information stored in the cookie.
2. Limit the subdomains and paths to prevent interception by another application.
3. Enforce SSL so the cookie isn’t sent in cleartext.
4. Make the cookie HttpOnly so its not accessible to javascript.

Does Localstorage work across subdomains?

If the data to be stored is needed on multiple subdomains, local storage also does not work – because local storage is subdomain-specific. Cookies, on the other hand, are more flexible in scope – they can be written to work across multiple subdomains (or even all subdomains on the same top-level domain).

Is a subdomain a third party cookie?

3 Answers. Cookies seem to be considered 3rd party if they come from different base domains (base domains being example.com or example.co.uk ), but not if they come from different subdomains of the same base domain.

When should I use localStorage VS cookies?

cookies can store only a much smaller amount of information; the capacity for cookies is 4 Kb for most browsers while local storage and session storage can hold 10 Mb and 5 Mb respectively. This means that cookies are going to be much smaller than local storage and session storage but that’s okay for their use cases.

Can a cookie be set from a subdomain?

In summary, if you set a cookie like the second example above from mydomain.com, it would be accessible by subdomain.mydomain.com, and vice versa. This can also be used to allow sub1.mydomain.com and sub2.mydomain.com to share cookies. Please everyone note that you can set a cookie from a subdomain on a domain.

How to securely set a cookie on another?

I’m aware of a few approaches: hub sets the cookie on example.com This works, but the cookie propagates to other subdomains. Also a risky subdomain like lab could set the cookie. learn provides a setCookie controller.

Is it safe to set the Secure flag on cookies?

E.g. a network attacker could intercept outbound HTTP requests and redirect them to capture the plaintext cookies. Even if the server uses HTTP Strict Transport Security (HSTS) and includes subdomains and the domain is on the preload list, it’s a good practice to still set the Secure Flag.

Can you share cookies in a single domain?

As other people say, you cannot share cookies, but you could do something like this: centralize all cookies in a single domain, let’s say cookiemaker.com. when the user makes a request to example.com you redirect him to cookiemaker.com. cookiemaker.com redirects him back to example.com with the information you need.