Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ethereum | Go Ethereum | < 1.9.17 |
Related Weaknesses (CWE)
References
- https://blog.ethereum.org/2020/11/12/geth_security_release/Vendor Advisory
- https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jfThird Party Advisory
- https://blog.ethereum.org/2020/11/12/geth_security_release/Vendor Advisory
- https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jfThird Party Advisory
FAQ
What is CVE-2020-26241?
CVE-2020-26241 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 v...
How severe is CVE-2020-26241?
CVE-2020-26241 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-26241?
Check the references section above for vendor advisories and patch information. Affected products include: Ethereum Go Ethereum.