Shallow copy bug in geth

高 7.1CVE-2020-26241 · GHSA-69v6-xc2j-r2jf · GO-2022-0771 · 25/11/2020 公開 · 17/06/2026 更新

要点

CVE-2020-26241 は github.com/ethereum/go-ethereum, go ethereum (ethereum) に影響する深刻度「高」 (CVSS 7.1) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.2%（全脆弱性の 68.8% より高い）。
対処：1.9.17 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/ethereum/go-ethereum Go	`≥ 1.9.7, < 1.9.17`	`1.9.17`
go ethereum ethereum	`< 1.9.17`	`1.9.17`

概要

Impact

This is a Consensus vulnerability, 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,
calls 0x00..04 with R as an argument,
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.

Patches

No standalone patches have been made.

Workarounds

Upgrade to 1.9.17 or higher.

References

https://blog.ethereum.org/2020/11/12/geth_security_release/

For more information

If you have any questions or comments about this advisory:

Open an issue in go-ethereum
Email us at [email protected]

NVD の説明

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.