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CVE-2021-43839

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Date: December 21, 2021

Cronos is a commercial implementation of a blockchain. In Cronos nodes running versions before v0.6.5, it is possible to take transaction fees from Cosmos SDK's FeeCollector for the current block by sending a custom crafted MsgEthereumTx. This problem has been patched in Cronos v0.6.5. There are no tested workarounds. All validator node operators are recommended to upgrade to Cronos v0.6.5 at their earliest possible convenience.

Language: Go

Severity Score

Related Resources (5)

https://github.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9r
https://nvd.nist.gov/vuln/detail/CVE-2021-43839
https://github.com/crypto-org-chain/cronos/pull/270
https://github.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8
https://www.mend.io/vulnerability-database/CVE-2021-43839

Severity Score

Weakness Type (CWE)

Always-Incorrect Control Flow Implementation

CWE-670

Top Fix

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Upgrade Version

Upgrade to version github.com/crypto-org-chain/cronos - v0.6.5

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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