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CVE-2021-39177— User impersonation due to incorrect handling of the login JWT

Quick assessment

Affected
GeyserMC Geyser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Github Geyser是Geyser 是 Minecraft: Bedrock Edition 和 Minecraft: Java Edition 之间的桥梁，缩小了那些想要真正跨平台玩的人之间的差距。 Geyser 1.4.2-SNAPSHOT之前版本存在授权问题漏洞，该漏洞源于Geyser 是 Minecraft: Bedrock Edition 和 Minecraft: Java Edition 之间的桥梁。 Geyser 1.4.2-SNAPSHOT 之前的版本允许任何可以连接到服务器的人伪造

CVSS 7.4 · High EPSS 1.43% · P71

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2021-39177

Vulnerability Information
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Vulnerability Title
User impersonation due to incorrect handling of the login JWT
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Github Geyser授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Github Geyser是Geyser 是 Minecraft: Bedrock Edition 和 Minecraft: Java Edition 之间的桥梁，缩小了那些想要真正跨平台玩的人之间的差距。 Geyser 1.4.2-SNAPSHOT之前版本存在授权问题漏洞，该漏洞源于Geyser 是 Minecraft: Bedrock Edition 和 Minecraft: Java Edition 之间的桥梁。 Geyser 1.4.2-SNAPSHOT 之前的版本允许任何可以连接到服务器的人伪造
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GeyserMC Geyser <= 1.4.1-SNAPSHOT -

II. Public POCs for CVE-2021-39177

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III. Intelligence Information for CVE-2021-39177

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Patches & Fixes for CVE-2021-39177 (1)

Vendor Advisories for CVE-2021-39177 (1)

Other References for CVE-2021-39177 (1)

IV. Related Vulnerabilities

Same product: Geyser
Same vendor: GeyserMC
Same weakness: CWE-287

V. Comments for CVE-2021-39177

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