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<7ED2BCD8-BAE3-48E3-9749-A396F3724B6E@petertodd.org>
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From: Matt Morehouse <mattmorehouse@gmail.com>
Date: Mon, 16 Oct 2023 22:10:06 +0000
Message-ID: <CAGyamEUHHBGVBys7kQCNZ95Zd6jqiq+VJW0gTgV_gGeGBFBJoA@mail.gmail.com>
To: Peter Todd <pete@petertodd.org>,
Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] Full Disclosure: CVE-2023-40231 / CVE-2023-40232
/ CVE-2023-40233 / CVE-2023-40234 "All your mempool are belong to us"
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On Mon, Oct 16, 2023 at 7:21=E2=80=AFPM Peter Todd via bitcoin-dev
<bitcoin-dev@lists.linuxfoundation.org> wrote:
> I think if you want people to understand this exploit, you need to explai=
n in more detail how we have a situation where two different parties can sp=
end the same HTLC txout, without the first party having the right to spend =
it via their knowledge of the HTLC-preimage.
The two main ways of spending an "offered" HTLC txout:
1) With a presigned multisig covenant transaction paying to the
offerer (a.k.a HTLC-timeout transaction)
2) With a preimage and the receiver's signature
Since option 1 uses a presigned covenant held by the offerer, only the
offerer can spend via that path.
Since option 2 requires the receiver's signature, only the receiver
can spend via that path.
The exact script used is here:
https://github.com/lightning/bolts/blob/master/03-transactions.md#offered-h=
tlc-outputs.
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