CVE-2024-38365
Publiée le 2024-10-11 · Dernière modification le 2026-06-17
Les nœuds Bitcoin `btcd` (versions 0.10 à 0.24) sont affectés par une erreur logique dans la manière dont ils traitent certaines transactions par rapport aux autres clients Bitcoin. Un attaquant peut diffuser à distance une transaction spécialement conçue sur le réseau P2P pour amener les nœuds `btcd` à rejeter des blocs valides ou à accepter des blocs invalides, ce qui pourrait entraîner une scission de la chaîne (chain split) ou un déni de service. Cela ne nécessite ni authentification ni interaction de l'utilisateur, bien que l'exécution soit techniquement complexe.
DÉTAIL DU VECTEUR CVSS
RÉFÉRENCES
Description officielle du NVD (en anglais)
btcd is an alternative full node bitcoin implementation written in Go (golang). 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. `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. This has been patched in btcd version v0.24.2. Users are advised to upgrade. There are no known workarounds for this issue.