Subject: Re: [bitcoindev] A Free-Relay Attack Exploiting RBF Rule #6

From: "David A. Harding" <[email-masked]>
Date: Tue, 26 Mar 2024 08:36:45 -1000

On 2024-03-18 03:21, Peter Todd wrote:
> [...] the existence of this attack is an argument in favor of
> replace-by-fee-rate. While RBFR introduces a degree of free-relay, the 
> fact
> that Bitcoin Core's existing rules *also* allow for free-relay in this 
> form
> makes the difference inconsequential.
> 
> # Disclosure
> 
> This issue was disclosed to bitcoin-security first. I received no 
> objections to
> making it public. All free-relay attacks are mitigated by the 
> requirement to at
> least have sufficient funds available to allocate to fees, even if the 
> funds
> might not actually be spent.

Could you tell us more about the disclosure process you followed?  I'm 
surprised to see it disclosed without any apparent attempt at patching.  
I'm especially concerned given your past history of publicly revealing 
vulnerabilities before they could be quietly patched[1] and the conflict 
of interest of you using this disclosure to advocate for a policy change 
you are championing.

-Dave

[1] 
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-June/016100.html

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