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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2020-11-25T01:25:20

Updated: 2024-08-04T15:56:03.871Z

Reserved: 2020-10-01T00:00:00

Link: CVE-2020-26241

cve-icon Vulnrichment

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cve-icon NVD

Status : Modified

Published: 2020-11-25T02:15:11.047

Modified: 2024-11-21T05:19:37.783

Link: CVE-2020-26241

cve-icon Redhat

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