PT-2020-16387 · Ethereum · Geth

Fjl + 1 · Published 2020-12-11 · Updated 2021-06-29 · CVE-2020-26264

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Geth versions prior to 1.9.25

Description A denial-of-service issue can cause a LES server crash via a malicious GetProofsV2 request from a connected LES client. This issue only affects users who have explicitly enabled the LES server. Disabling the LES server prevents the exploit.

Recommendations For versions prior to 1.9.25, update to version 1.9.25 or later to resolve the issue. As a temporary workaround, consider disabling the LES server to prevent the exploit. Manually applying the patch from https://github.com/ethereum/go-ethereum/pull/21896 can also fix the vulnerability.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2020-26264

GHSA-R33Q-22HV-J29Q

GO-2021-0063

Affected Products

Geth

References · 18

• https://github.com/ethereum/go-ethereum/pull/21896 · Patch
• https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46 · Patch
• https://osv.dev/vulnerability/CVE-2020-26264 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-26264 · Security Note
• https://osv.dev/vulnerability/GO-2021-0063 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-r33q-22hv-j29q · Vendor Advisory
• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29q · Note
• https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25 · Note
• https://github.com/ethereum/go-ethereum · Note
• https://t.me/cibsecurity/20359 · Telegram Post
• https://t.me/cvenotify/7030 · Telegram Post
• https://t.me/cibsecurity/20379 · Telegram Post
• https://t.me/cvenotify/7024 · Telegram Post
• https://pkg.go.dev/vuln/GO-2021-0063 · Note
• https://t.me/cibsecurity/20456 · Telegram Post