CVE-2020-26241: 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…

PriorityP336high7.1CVSS 3.1

AVNACLPRLUINSUCNIHAL

EPSS

1.08%

60.9th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
ethereum	go-ethereum	—	—
ethereum	go_ethereum	< 1.9.17	1.9.17
github.com	ethereum_go-ethereum	>= 1.9.7 < 1.9.17	1.9.17

CVSS provenance

nvdv3.17.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

nvdv2.05.5MEDIUMAV:N/AC:L/Au:S/C:N/I:P/A:P

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