Fail channel in case of high-S remote signature reception #807
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
cfromknecht
reviewed
Oct 26, 2020
02-peer-protocol.md
Outdated
| The recipient: | ||
| - if `signature` is incorrect: | ||
| - if `signature` is incorrect OR non-compliant with LOW-S-standard rule<sup>[LOWS](https://github.com/bitcoin/bitcoin/pull/6769)</sup>: | ||
|
|
Collaborator
|
Ack. Sometimes you just gotta repeat yourself. |
See CVE-2020-26895 for context.
This comment was marked as abuse.
This comment was marked as abuse.
t-bast
reviewed
Nov 2, 2020
Collaborator
|
Merging according to spec meeting decision. |
SomberNight
added a commit
to SomberNight/electrum
that referenced
this pull request
May 27, 2024
The low-S rule for ecdsa signatures is mandated by Bitcoin Core policy/standardness (though not by consensus). If we get signatures from untrusted sources, we should mandate they obey the policy rules. (e.g. from LN peers) Note that we normalize the signatures in the sig format conversion methods (DER <-> (r,s) <-> sig64). The BOLTs treat high-S signatures as invalid, and this changes our behaviour to that. (previously we would silently normalize the S value) see bitcoin/bitcoin#6769 see lightning/bolts#807
ahmedbodi
pushed a commit
to ahmedbodi/electrum-hemis
that referenced
this pull request
Aug 28, 2024
The low-S rule for ecdsa signatures is mandated by Bitcoin Core policy/standardness (though not by consensus). If we get signatures from untrusted sources, we should mandate they obey the policy rules. (e.g. from LN peers) Note that we normalize the signatures in the sig format conversion methods (DER <-> (r,s) <-> sig64). The BOLTs treat high-S signatures as invalid, and this changes our behaviour to that. (previously we would silently normalize the S value) see bitcoin/bitcoin#6769 see lightning/bolts#807
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
See CVE-2020-26895 for context.
Note, the requirement is on every remote signature reception instead of a global note. We make this a reception requirement, which doesn't prevent implementation to harden by normalizing to low-S at transactions broadcasting.