FitMC is WRONG about RANDAR on Minecraft's 2b2t

Published: 17 April 2024
on channel: Hermeticlock

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2b2t's randar exploit, also referred to as why is munmap at my base was created by pcm1k, leijurv and friends.

Even if you play on a server that has updated to a newer version of Minecraft, or has otherwise patched RNG manipulation, your coordinates are still at risk from Randar due to the ability to exploit RNG data retroactively. Some Minecraft players use mods like ReplayMod that log packets, and they might still have those log files sitting around. If anyone was using such a mod while you were at your base, they may have (unknowingly) recorded RNG data that could reveal your location, because breaking blocks is an extremely common action that's likely to have happened in such recordings, and every such block break reveals the server's RNG state and therefore the location of the most recently loaded chunk. This means Randar is a pretty big deal: due to this risk of exploiting retroactively, on every Minecraft server, every location that was active in versions Beta 1.8 through 1.12.2 should be considered compromised, even if the server has long since updated past 1.12.2 or patched RNG manipulation.

Special thanks to ‪@leijurv‬ for providing the real story and giving me voice clips.

Randar explanation: https://randar.2b2t.website/
Use randar yourself with replay mod: https://hobune.stream/randar/

Fun animations done with mods by ‪@McHorsesCreations‬namely blockbuster and aperture.

#fitmc #2b2t #minecraft

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