Vulnerability Details CVE-2021-39177
Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 57.0%
CVSS Severity
CVSS v3 Score 7.4
CVSS v2 Score 7.5
References
- https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6
- https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858
- https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY
- https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6
- https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858
- https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY