MC-114773Exploit that can crash any server and fill up it's HDD/SSD
Basically, this exploit allows you to be in multiple places at once(called super-positioning), and allows you to crash any server. The exploit also allows you to fill up a server's HDD and SDD within minutes by being in multiple places at once as the same player character generating new chunks. This can also lead to corruption of the server's words and possible data loss depending on the filesystem of the server's HDD and SSD.
This exploit is very serious, and hense should be treated as top-priority. I have also linked a video that explains the issue into more detail created by FitMC on YouTube.
First instance of this exploit was encountered by FitMC on 2B2T about 24 hours ago.
Since the exploit has only been recently discovered, no one knows the true cause except for the exploiter himself. So we can only brainstorm the possible cause right now.
Below is a possible cause and solution for the exploit based on the info we have right now. It may not be correct, so don't go implanting it just yet.
A possible cause for this exploit could be by sending several different position packets at the same exact time for your character, which in turn could make the server think that you are in multiple places at the same time, replicating what the exploiter has achieved.
If the exploit is indeed that simple as above, then this could easily be fixed by checking if the player is located in more than one area, and kicking the player if they are in more than one area at a time. But because the exact cause isn't known, we don't know how to fix it exactly.
