I just got banned by Immunefi for reporting a real replay attack on LayerZero V2

5•tangou•6mo ago

I just got banned by Immunefi for reporting a real replay attack on LayerZero V2.

I discovered that lzReceive() allows infinite replays of valid cross-chain messages, due to the lack of guid tracking. This results in repeated token crediting — a critical flaw.

My PoC used real deployed contracts, no forged data. The vulnerability is 100% reproducible.

Instead of investigating, Immunefi rejected my report without a technical rebuttal — and banned me for "complexity poaching".

Full Story: https://medium.com/@tangouvitch/immunefi-banned-me-for-reporting-a-real-replay-attack-in-layerzero-v2-71d5ee0ff102

Do you think this is a valid bug? Was the ban justified? Should Immunefi be held accountable?

Curious to hear what the Ethereum community thinks.

Comments

lompad•6mo ago

Interesting, can this directly be used to make money? Maybe by the employee reading your report?

Edit: Maybe send a report to steve from grc, he loves those kinds of stories.

xxHkrPkrxx•6mo ago

Yeah I've spent a lot of time, writing PoC and they keep getting denied depending on the company, why even try to save their asses, and assets if they're going to treat us like this, starting to really get depressed.

LLMs are powerful, but enterprises are deterministic by nature

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