Vulnerability Details : CVE-2020-26241

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.
Published 2020-11-25 02:15:11
Updated 2020-12-03 15:48:39
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2020-26241

Exploit prediction scoring system (EPSS) score for CVE-2020-26241

EPSS FAQ
0.07%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 30 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-26241

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.5
 MEDIUM AV:N/AC:L/Au:S/C:N/I:P/A:P
8.0
4.9
 NIST
7.1
 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
2.8
4.2
 NIST
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.8
3.6
 GitHub, Inc.

CWE ids for CVE-2020-26241

  • The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2020-26241

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