CVE-2020-26241: medium-severity vulnerability in ethereum go-ethereum
Shallow copy bug in geth
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 1.2%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected products
ethereum · go-ethereumRelated CVEs — ethereum go-ethereum
In the same product, most dangerous first.
CVE-2020-26264MEDIUMLES Server DoS via GetProofsV2EPSS 1.9%CVE-2020-26240MEDIUMErroneous Proof of Work calculation in gethEPSS 1.9%CVE-2020-26242MEDIUMDenial of service in gethEPSS 1.5%CVE-2021-39137MEDIUMConsensus flaw during block processing in go-ethereumEPSS 1.3%CVE-2021-41173MEDIUMDoS via maliciously crafted p2p messageEPSS 1.2%CVE-2022-29177MEDIUMDoS via malicious p2p message in Go-EthereumEPSS 1.2%