[MC-5674] Client can control if they take damage and abuse this / ALT or F10 freezes client in windowed mode Created: 02/Jan/13  Updated: 07/Feb/19  Resolved: 24/Apr/13

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.6, Minecraft 1.4.7, Minecraft 1.5, Snapshot 13w11a
Fix Version/s: Snapshot 13w16a

Type: Bug
Reporter: libraryaddict Assignee: Unassigned
Resolution: Fixed Votes: 3
Labels: abuse, alt, damage, invincibility, pvp, unintended

Attachments: PNG File 2013-01-02_21.49.21.png     Text File crash-2013-01-02_23.04.59-client.txt    
Issue Links:
Duplicate
is duplicated by MC-7185 keybord, press any key bug Resolved
is duplicated by MC-7958 Invincibility after first hit when pr... Resolved
is duplicated by MC-8151 Pressing alt freezes players and make... Resolved
is duplicated by MC-9920 Press "alt" key and become locked in ... Resolved
is duplicated by MC-10128 Hitting the "ALT" key while in a serv... Resolved
is duplicated by MC-13329 My command button does not work! Resolved
is duplicated by MC-22591 Alt pause no longer works Resolved
Relates
relates to MC-6721 Ctrl + Alt + Esc crashes minecraft Resolved
relates to MCL-72 Pressing ALT in the launcher throws e... Resolved
CHK:
Confirmation Status: Confirmed
Game Mode: Survival

 Description   

When the player presses 'alt' he stops sending packets to the server.
The server then stops processing anything done to the player.
Aka invincibility.

The player can effectively in PVP run into a huge gang, Press 'alt' and.. Well. Get the server owners very pissed off as people are complaining about the hackers who are invincible.

In a small server this may be fine.. A large server? Too many players to ban for abusing this.

This feature should only be available in Single Player as it effects survival very badly.

Fell off a cliff? Server is a death ban and a npc spawns when you log?
No problem bro. Just press alt and get your friend over with a bucket of water!

Fell in lava? No problem! Want to survive each round of a survival games? No problem! Press alt and check back regularly to see how much money you been earning for surviving!

Players have been abusing this like shit in a Hungergames style server.

The last few people to survive are rewarded money. Guess how many naked guys are sitting around spawn while diamond guys are prancing around them trying to hit them. And guess how many of the diamond guys lose their spot in the rankings to that naked player..

Even sticking in a 'timer' or 'countdown' in which they are d/c wouldn't help.
They could just press 'alt' every 20 seconds.

Then if you made it lower. The feature is now redundant.

The only good thing about this whole issue, They can't auctally see whats going on in the game without another account.

And yes. This is more then easy for a hacker client to do. One hacker client to 'alt', The other client is just looking around for when the path is clear to move around again.



 Comments   
Comment by libraryaddict [ 31/Jan/13 ]

Actually just realized something.

All alt does is prevents their sending packets.
Something a modified client could easily readd to retain the same functionality.

Comment by Tails [ 26/Jan/13 ]

To fix this bug requires a new launcher, which won't be added until 1.6.

Comment by libraryaddict [ 26/Jan/13 ]

Er.

Is this being worked on.. or?

Feeling like this bug would get more attention and be fixed if I just make it public.

Comment by Tails [ 15/Jan/13 ]

Applies to F10 aswell. The freezing part is actually documented on the Wiki.

Comment by Kumasasa [ 02/Jan/13 ]

Forced crash report attached.

Comment by Kumasasa [ 02/Jan/13 ]

Fully confirmed the original issue.
ALT releases the mouse and freezes the client until the next mouse click or keypress.
The server doesn't recognize anything.

Comment by Kumasasa [ 02/Jan/13 ]

Attached screenshot: I was riding a minecart, pressed ALT (windowed mode) and got invicible. My minecart could be destroyed, leaving me floating in the air.

Comment by Kumasasa [ 02/Jan/13 ]

Confirmed.
In fullscreen mode ALT does in fact nothing, but in windowed mode the screen freezes.
I don't know the consequences of this yet, but set this ticket to private.

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