Saving a yummy treat

I currently have 3 websites in need of storing a cookie that can be accessed by each site. I have created a single ASPX file to handle the storage of this cookie for all 3 sites. On every page of these websites, there is JavaScript code calling the ASPX file to save the cookie. However, even though the ASPX file is on one domain and loaded as an image, why are the cookies not being written to the same location? Here is a breakdown:

We have X.com, Y.com, and Z.com as the three existing sites.

Y.com/cookiesave.aspx is also present and it creates a cookie named "bob" with a unique identifier if it does not already exist.

On each page of X.com, Y.com, and Z.com, there is JavaScript code loading an image from Y.com/cookiesave.aspx which returns a transparent 1x1 pixel image. Despite this, the cookies seem to be saved and accessed separately by each site. How does the script differentiate between the sites, especially when it is hosted on Y.com only?

javascript.netasp.netcookies

Answer №1

The security measures in place to prevent this type of activity are implemented by the browser developers to thwart cross-site scripting attacks. To achieve your goal legitimately, consider using domains like x.myweb.com, y.myweb.com, and z.myweb.com, and set your cookie(s) for the main domain myweb.com instead of individually for each subdomain.

It's important to note that defenses against such behaviors extend beyond just browsers; security gateways, firewalls, and other systems also monitor for suspicious activities as they are usually associated with malicious intent. Unless you have harmful intentions, it is advisable to adhere to the recommended approach. And of course, refrain from engaging in any form of attack.

Answer №2

Cookie sharing requires the same originating domain. Each cookie has both a cookie domain and cookie path. The default setting for the cookie domain is the domain of the current page, such as www.example.com. To share a cookie between multiple domains, those domains must be similar to:

x.example.com
y.example.com
z.example.com

In this case, the cookie domain should be set to example.com (not .com itself).

The cookie path specifies the server's path where the cookie should be applicable. Typically, it is set as / to allow any path to receive the cookie. However, you can also specify a specific path like /specific-path, so that only pages under that path will get the cookie.

Note:

Most modern browsers prevent cookies from third-party sources that are different from the site being visited.

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