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Vulnerability CVE-2020-26241
Published: 2020-11-25
| 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. |
Type:
CWE-682 (Incorrect Calculation)
References: |
https://blog.ethereum.org/2020/11/12/geth_security_release/
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf
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