CVE-2024-38365 – github.com/btcsuite/btcd

Package

Manager: go
Name: github.com/btcsuite/btcd
Vulnerable Version: >=0 <0.24.2-beta.rc1

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00087 pctl0.25945

Details

btcd did not correctly re-implement Bitcoin Core's "FindAndDelete()" functionality ### Impact The btcd Bitcoin client (versions 0.10 to 0.24) did not correctly re-implement Bitcoin Core's "FindAndDelete()" functionality. This logic is consensus-critical: the difference in behavior with the other Bitcoin clients can lead to btcd clients accepting an invalid Bitcoin block (or rejecting a valid one). This consensus failure can be leveraged to cause a chain split (accepting an invalid Bitcoin block) or be exploited to DoS the btcd nodes (rejecting a valid Bitcoin block). An attacker can create a standard transaction where FindAndDelete doesn't return a match but removeOpCodeByData does making btcd get a different sighash, leading to a chain split. Importantly, this vulnerability can be exploited remotely by any Bitcoin user and does not require any hash power. This is because the difference in behavior can be triggered by a "standard" Bitcoin transaction, that is a transaction which gets relayed through the P2P network before it gets included in a Bitcoin block. #### `FindAndDelete` vs. `removeOpcodeByData` `removeOpcodeByData(script []byte, dataToRemove []byte)` removes any data pushes from `script` that *contain* `dataToRemove`. However, `FindAndDelete` only removes *exact* matches. So for example, with `script = "<data> <data||foo>"` and `dataToRemove = "data"` btcd will remove both data pushes but Bitcoin Core's `FindAndDelete` only removes the first `<data>` push. ### Patches This has been patched in `btcd` version v0.24.2-beta. ### References `FindAndDelete`: https://github.com/btcsuite/btcd/security/advisories/GHSA-27vh-h6mc-q6g8

Metadata

Created: 2024-10-10T16:43:17Z
Modified: 2025-08-21T04:05:13Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/10/GHSA-27vh-h6mc-q6g8/GHSA-27vh-h6mc-q6g8.json
CWE IDs: ["CWE-670"]
Alternative ID: GHSA-27vh-h6mc-q6g8
Finding: F164
Auto approve: 1