PocketMine-MP versions before 5.3.1 and 4.23.1 fail to validate that the identityPublicKey in LoginPacket uses the required secp384r1 elliptic curve. Attackers can provide LoginPackets with keys using different curves or non-EC key types to pass login verification but trigger an uncaught exception during ECDH key derivation, crashing the server.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/pmmp/PocketMine-MP/commit/4e646d19a4a1e0d082bd4d1f5a58ae0182…
disclosure@vulncheck.com
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-79rc-jjh6-rc89
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/pocketmine-mp-5.2.0-server-crash-via-incor…
disclosure@vulncheck.com