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CVE-2020-26265: Incorrect Calculation

June 29, 2021 (updated February 9, 2023)

Go Ethereum, or “Geth”, is the official Golang implementation of the Ethereum protocol. In Geth from version 1.9.4 and before version 1.9.20 a consensus-vulnerability could cause a chain split, where vulnerable versions refuse to accept the canonical chain. The fix was included in the Paragade release version 1.9.20. No individual workaround patches have been made – all users are recommended to upgrade to a newer version.

References

  • github.com/advisories/GHSA-xw37-57qp-9mm4
  • github.com/ethereum/go-ethereum/commit/87c0ba92136a75db0ab2aba1046d4a9860375d6a
  • github.com/ethereum/go-ethereum/pull/21080
  • github.com/ethereum/go-ethereum/pull/21409
  • github.com/ethereum/go-ethereum/releases/tag/v1.9.20
  • github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4
  • nvd.nist.gov/vuln/detail/CVE-2020-26265
  • pkg.go.dev/vuln/GO-2021-0105

Code Behaviors & Features

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Affected versions

All versions starting from 1.9.4 before 1.9.20

Fixed versions

  • v1.9.20

Solution

Upgrade to version 1.9.20 or above.

Impact 5.3 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-682: Incorrect Calculation
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Source file

go/github.com/ethereum/go-ethereum/core/state/CVE-2020-26265.yml

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