| id: GO-TEST-ID |
| modules: |
| - module: github.com/ethereum/go-ethereum |
| versions: |
| - introduced: 1.9.7 |
| fixed: 1.9.17 |
| vulnerable_at: 1.9.16 |
| - module: github.com/ethereum/go-ethereum |
| versions: |
| - fixed: 1.19.7 |
| packages: |
| - package: github.com/ethereum/go-ethereum/core/vm |
| summary: Shallow copy bug in geth in github.com/ethereum/go-ethereum |
| description: |- |
| ### 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`. |
| |
| ### For more information If you have any questions or comments about this |
| advisory: |
| * Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum) |
| * Email us at [security@ethereum.org](mailto:security@ethereum.org) |
| cves: |
| - CVE-2020-26241 |
| ghsas: |
| - GHSA-69v6-xc2j-r2jf |
| references: |
| - advisory: https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf |
| - fix: https://github.com/ethereum/go-ethereum/commit/295693759e5ded05fec0b2fb39359965b60da785 |
| - web: https://blog.ethereum.org/2020/11/12/geth_security_release/ |
| notes: |
| - lint: 'description: possible markdown formatting (found ### )' |
| - lint: 'description: possible markdown formatting (found [go-ethereum](https://github.com/ethereum/go-ethereum))' |
| - lint: 'description: possible markdown formatting (found `dataCopy` (at `0x00...04`)' |
| - lint: 'modules[1] "github.com/ethereum/go-ethereum": packages[0] "github.com/ethereum/go-ethereum/core/vm": at least one of vulnerable_at and skip_fix must be set' |
| - lint: 'modules[1] "github.com/ethereum/go-ethereum": version 1.19.7 does not exist' |
