CVE-2020-26241 (GCVE-0-2020-26241)

Vulnerability from cvelistv5 – Published: 2020-11-25 01:25 – Updated: 2024-08-04 15:56
VLAI?
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.
Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
ethereum go-ethereum Affected: >= 1.9.7, < 1.9.17
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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