{
  "id": "CVE-2023-42806",
  "sourceIdentifier": "security-advisories@github.com",
  "published": "2023-09-21T17:15:23.583",
  "lastModified": "2024-11-21T08:23:11.767",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, not signing and verifying `$\\mathsf{cid}$` allows an attacker (which must be a participant of this head) to use a snapshot from an old head instance with the same participants to close the head or contest the state with it. This can lead to an incorrect distribution of value (= value extraction attack; hard, but possible) or prevent the head to finalize because the value available is not consistent with the closed utxo state (= denial of service; easy). A patch is planned for version 0.13.0. As a workaround, rotate keys between heads so not to re-use keys and not result in the same multi-signature participants."
    },
    {
      "lang": "es",
      "value": " Hydra es the layer-two scalability solution para Cardano. Antes de la versi\u00f3n 0.13.0, no firmar ni verificar `$\\mathsf{cid}$` permite que un atacante (que debe ser un participante de este encabezado) use una instant\u00e1nea de una instancia principal anterior con los mismos participantes para cerrar el encabezado o disputar al Estado. Esto puede llevar a una distribuci\u00f3n incorrecta del valor (= ataque de extracci\u00f3n de valor; dif\u00edcil, pero posible) o impedir que la cabeza finalice porque el valor disponible no es consistente con el estado utxo cerrado (= denegaci\u00f3n de servicio; f\u00e1cil). Est\u00e1 previsto un parche para la versi\u00f3n 0.13.0. Como workaround, rote las claves entre los cabezales para no reutilizarlas y no generar los mismos participantes con firmas m\u00faltiples."
    }
  ],
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          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
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      "url": "https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/HeadLogic.hs#L357",
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