CVE-2020-26241 (GCVE-0-2020-26241)
Vulnerability from cvelistv5
Published
2020-11-25 01:25
Modified
2024-08-04 15:56
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE
Summary
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.
References
security-advisories@github.comhttps://blog.ethereum.org/2020/11/12/geth_security_release/Vendor Advisory
security-advisories@github.comhttps://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jfThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://blog.ethereum.org/2020/11/12/geth_security_release/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jfThird Party Advisory
Impacted products
Vendor Product Version
ethereum go-ethereum Version: >= 1.9.7, < 1.9.17
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