Authentication Bypass in org.geysermc:connector (CVE-2021-39177)
Summary
Authentication bypass in org.geysermc:connector (CVE-2021-39177). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.4.2-SNAPSHOT or later.
Original description
The description as published by the source.
Impact
<!--_What kind of vulnerability is it? Who is impacted?_-->This allows anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any Bedrock user. Unless credentials are saved in your configuration, online mode is not affected as users are still required to log in separately. If your credentials are saved, there is no risk of exposing your email or password.
Patches
<!--_Has the problem been patched? What versions should users upgrade to?_-->This was patched as part of https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6 and https://github.com/GeyserMC/Geyser/commit/ab2f5b326fe590e09167e8b45b4b165ac06ecd13. if your Geyser version is 1.4.2-SNAPSHOT or later, the issue has been addressed on your build.
Workarounds
<!--_Is there a way for users to fix or remediate the vulnerability without upgrading?_-->Geyser strongly recommends updating to fix this issue. If this isn't possible:
- Use online mode and don't save credentials in your Geyser configuration
- Use an additional authentication method on the Java server
References
<!--_Are there any links users can visit to find out more?_-->This was disclosed to us by a staff member over at Hive; you can read their disclosure here: https://updates.playhive.com/changelog/weekend-maintenance-breakdown
For more information
If you have any questions or comments about this advisory:
- Come talk to us over on our [Disco…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-39177 has been found in org.geysermc:connector.
Risk of unauthorized operations or information disclosure.
What to do: upgrade org.geysermc:connector to 1.4.2-SNAPSHOT or later.
If unsure, ask your IT team or search "org.geysermc:connector CVE-2021-39177" on the vendor's site.
CVE-2021-39177 (org.geysermc:connector) — CWE-287
Patched: 1.4.2-SNAPSHOT — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Authentication bypass (CWE-287) exists in org.geysermc:connector.
Check the vendor advisory for the affected versions of org.geysermc:connector.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.4.2-SNAPSHOT.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで org.geysermc:connector を使っているサービスとバージョンを洗い出す。
-
2Apply patch patch
Upgrade org.geysermc:connector to 1.4.2-SNAPSHOTステージング環境で 1.4.2-SNAPSHOT に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web updates.playhive.com
- web github.com