BDS-16776The server does not check the size (length) of the nickname
The server does not check the size (length /number of characters in the nickname) when the client connects to the server.
Steps to reproduce:
1.Open the file options.txt,edit the value in mp_username (For example:123456789a123456789b123456789c123456789),save the file.
2.Log in to the server.
Waiting:
The server will check the size of the nickname and if it exceeds a certain value (number of characters) it will reset this "suspicious connection"
Actually:
The server accepts absolutely any size and values from the nickname.
Note:
This can be used to crash the server, you can edit options.txt so that the size of the nickname would be more than 71MB of text.You can do more, it depends on the power and the amount of RAM on the client device.
Upload a special file options.txt the size of 71MB I can't.Uploaded an analog with a smaller nickname.
Linked Issues
Attachments3
Comments7
History8
Added Security Level: Minecraft - Private
Resolution: Unresolved → Awaiting Response
Resolution: Awaiting Response → Unresolved
Resolution: Unresolved → Awaiting Response
Resolution: Awaiting Response → Unresolved
Added duplicates link: MCPE-152884Minecraft does not check the length of mp_username in options.txtFixed
Resolution: Unresolved → Duplicate
MEQS_KEEP_PRIVATE
Hi
Does this issue still occur after updating to 1.19.10?
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😑
Hi
What file do you need to edit to change nickname lenght?
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I don't think you understand what we are talking about.
The server receives a message about the nickname / indificator, does not check what the client tells it, processes and crashes, if the nickname is quite large.Which file, everything is listed above:options.txt . Where it is: at the client in Minecraft...
Thank you for your report!
We're tracking this issue in
MCPE-152884, so this ticket is being resolved and linked as a duplicate.If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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*If you fix it in the minecraft client and don't fix it on the server software side, the problem won't be solved.