| { |
| "schema_version": "1.4.0", |
| "id": "GHSA-69v6-xc2j-r2jf", |
| "modified": "2021-05-21T21:51:49Z", |
| "published": "2021-06-29T21:13:01Z", |
| "aliases": [ |
| "CVE-2020-26241" |
| ], |
| "summary": "Shallow copy bug in geth", |
| "details": "### Impact\nThis is a Consensus vulnerability, which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. \n\nGeth’s pre-compiled `dataCopy` (at `0x00...04`) contract did a shallow copy on invocation. An attacker could deploy a contract that \n\n- writes `X` to an EVM memory region `R`,\n- calls `0x00..04` with `R` as an argument,\n- overwrites `R` to `Y`,\n- and finally invokes the `RETURNDATACOPY` opcode.\n\nWhen this contract is invoked, a consensus-compliant node would push `X` on the EVM stack, whereas Geth would push `Y`.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)", |
| "affected": [ |
| { |
| "package": { |
| "ecosystem": "Go", |
| "name": "github.com/ethereum/go-ethereum" |
| }, |
| "ranges": [ |
| { |
| "type": "ECOSYSTEM", |
| "events": [ |
| { |
| "introduced": "1.9.7" |
| }, |
| { |
| "fixed": "1.9.17" |
| } |
| ] |
| } |
| ] |
| }, |
| { |
| "package": { |
| "ecosystem": "Go", |
| "name": "github.com/ethereum/go-ethereum/core/vm" |
| }, |
| "ranges": [ |
| { |
| "type": "ECOSYSTEM", |
| "events": [ |
| { |
| "introduced": "0" |
| }, |
| { |
| "fixed": "1.19.7" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "severity": [ |
| { |
| "type": "CVSS_V3", |
| "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N" |
| } |
| ], |
| "references": [ |
| { |
| "type": "WEB", |
| "url": "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf" |
| }, |
| { |
| "type": "ADVISORY", |
| "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26241" |
| }, |
| { |
| "type": "WEB", |
| "url": "https://github.com/ethereum/go-ethereum/commit/295693759e5ded05fec0b2fb39359965b60da785" |
| }, |
| { |
| "type": "WEB", |
| "url": "https://blog.ethereum.org/2020/11/12/geth_security_release/" |
| } |
| ], |
| "database_specific": { |
| "cwe_ids": [ |
| "CWE-682" |
| ], |
| "github_reviewed": true, |
| "github_reviewed_at": "2021-05-21T21:51:49Z", |
| "nvd_published_at": null, |
| "severity": "MODERATE" |
| } |
| } |
