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.
Vulnerability category: BypassGain privilege
Products affected by CVE-2021-39177
- cpe:2.3:a:geysermc:geyser:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-39177
0.35%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 55 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-39177
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST | |
|
7.4
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
2.2
|
5.2
|
GitHub, Inc. |
CWE ids for CVE-2021-39177
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-39177
-
https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858
User impersonation due to incorrect handling of the login JWT · Advisory · GeyserMC/Geyser · GitHubPatch;Third Party Advisory
-
https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY
Weekend Maintenance Breakdown - The Hive - UpdatesThird Party Advisory
-
https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6
Bump version to try and fix deploying; other nitpicks · GeyserMC/Geyser@b954150 · GitHubPatch;Third Party Advisory
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