Sonic 3 A.I.R. UDP Connection Handle Spoofing Vulnerability

Executive Summary

Sonic 3 A.I.R. before commit 2492d18 has a missing source address validation flaw in ConnectionManager. Connections are resolved using only a two-byte local handle without checking if the datagram source address matches the registered remote address. This allows an attacker on the same network path to inject packets into active sessions by forging the connection identifier.

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Detection Guidance

Detecting this vulnerability requires monitoring UDP traffic for forged connection identifiers. Inspect Sonic 3 A.I.R. server logs for unexpected TerminateConnectionPacket messages or forged channel messages. Use network sniffing tools like Wireshark to analyze UDP datagrams for mismatched source addresses in established sessions.

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Impact Analysis

An attacker could terminate your active sessions, forge messages in channels, or send fake responses to requests. This does not require IP spoofing but relies on observing cleartext UDP traffic. The impact includes session hijacking and potential manipulation of in-game communication.

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Mitigation Strategies

Update Sonic 3 A.I.R. to commit 2492d18 or later to address the vulnerability. Ensure UDP traffic is encrypted to prevent cleartext observation. Implement network-level controls to block unauthorized UDP packet injection.

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