// For flags

CVE-2021-39193

Transaction validity oversight in pallet-ethereum

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Frontier is Substrate's Ethereum compatibility layer. Prior to commit number 0b962f218f0cdd796dadfe26c3f09e68f7861b26, a bug in `pallet-ethereum` can cause invalid transactions to be included in the Ethereum block state in `pallet-ethereum` due to not validating the input data size. Any invalid transactions included this way have no possibility to alter the internal Ethereum or Substrate state. The transaction will appear to have be included, but is of no effect as it is rejected by the EVM engine. The impact is further limited by Substrate extrinsic size constraints. A patch is available in commit number 0b962f218f0cdd796dadfe26c3f09e68f7861b26. There are no workarounds aside from applying the patch.

Frontier es la capa de compatibilidad con Ethereum de Substrate. Anterior al commit número 0b962f218f0cdd796dadfe26c3f09e68f7861b26, un error en "pallet-ethereum" puede causar que se incluyan transacciones no válidas en el estado del bloque de Ethereum en "pallet-ethereum" debido a que no es comprobado el tamaño de los datos de entrada. Cualquier transacción no válida incluida de esta manera no presenta posibilidad de alterar el estado interno de Ethereum o del Substrato. La transacción parecerá haber sido incluida, pero no tiene ningún efecto ya que es rechazada por el motor EVM. El impacto es aún más limitado por las restricciones de tamaño extrínsecas del sustrato. Se presenta un parche disponible en el commit número 0b962f218f0cdd796dadfe26c3f09e68f7861b26. No se presentan soluciones aparte de aplicar el parche

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-08-16 CVE Reserved
  • 2021-09-03 CVE Published
  • 2024-05-19 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-1284: Improper Validation of Specified Quantity in Input
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Parity
Search vendor "Parity"
 Frontier
Search vendor "Parity" for product "Frontier"
 < 2021-09-03
Search vendor "Parity" for product "Frontier" and version " < 2021-09-03"
-
Affected