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CVE-2020-26241

MEDIUM
Published 2020-11-25T01:25:20
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CVSS Score

V3.1
6.5
/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.435
Higher than 43.5% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
HIGH
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

ethereum

go-ethereum

Affected Versions:

>= 1.9.7, < 1.9.17

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Shallow copy bug in geth

GHSA-69v6-xc2j-r2jf

Advisory Details

### 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](https://github.com/ethereum/go-ethereum) * Email us at [[email protected]](mailto:[email protected])

Affected Packages

Go github.com/ethereum/go-ethereum
ECOSYSTEM: ≥1.9.7 <1.9.17

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

WEB https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-26241
WEB https://github.com/ethereum/go-ethereum/commit/295693759e5ded05fec0b2fb39359965b60da785
WEB https://blog.ethereum.org/2020/11/12/geth_security_release
PACKAGE https://github.com/ethereum/go-ethereum

Advisory provided by GitHub Security Advisory Database. Published: June 29, 2021, Modified: January 30, 2025

References

https://blog.ethereum.org/2020/11/12/geth_security_release/
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-69v6-xc2j-r2jf
Published: 2020-11-25T01:25:20
Last Modified: 2024-08-04T15:56:03.871Z
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