// For flags

CVE-2023-42806

Snapshot signature not including HeadID will allow replay attacks

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

Hydra es the layer-two scalability solution para Cardano. Antes de la versión 0.13.0, no firmar ni verificar `$\mathsf{cid}$` permite que un atacante (que debe ser un participante de este encabezado) use una instantánea de una instancia principal anterior con los mismos participantes para cerrar el encabezado o disputar al Estado. Esto puede llevar a una distribución incorrecta del valor (= ataque de extracción de valor; difícil, pero posible) o impedir que la cabeza finalice porque el valor disponible no es consistente con el estado utxo cerrado (= denegación de servicio; fácil). Está previsto un parche para la versión 0.13.0. Como workaround, rote las claves entre los cabezales para no reutilizarlas y no generar los mismos participantes con firmas múltiples.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-09-14 CVE Reserved
  • 2023-09-21 CVE Published
  • 2024-09-24 CVE Updated
  • 2024-09-27 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-347: Improper Verification of Cryptographic Signature
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Iohk
Search vendor "Iohk"
Hydra
Search vendor "Iohk" for product "Hydra"
< 0.13.0
Search vendor "Iohk" for product "Hydra" and version " < 0.13.0"
-
Affected