CVE-2020-26241 Information

Description

Go Ethereum or \Geth\ is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth before version 1.9.17 which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth’s pre-compiled dataCopy (at 0x00…04) contract did a shallow copy on invocation. An attacker could deploy a contract that writes X to an EVM memory region R then calls 0x00..04 with R as an argument then overwrites R to Y and finally invokes the RETURNDATACOPY opcode. When this contract is invoked a consensus-compliant node would push X on the EVM stack whereas Geth would push Y. This is fixed in version 1.9.17.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Reference

https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf https://blog.ethereum.org/2020/11/12/geth_security_release/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

LOW

Base Severity

7.1