PT-2024-10751 · Unknown · Bitcoin Core

Braydon Fuller · Published 2024-11-18 · Updated 2024-11-18 · CVE-2019-25220

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Bitcoin Core versions prior to 24.0.1

Description The issue allows remote attackers to cause a denial of service, resulting in a daemon crash, via a flood of low-difficulty header chains, also known as a "Chain Width Expansion" attack. This occurs because a node does not first verify that a presented chain has enough work before committing to store it.

Recommendations For versions prior to 24.0.1, update to version 24.0.1 or later to resolve the issue. As a temporary workaround, consider implementing measures to limit the impact of a flood of low-difficulty header chains, such as restricting incoming connections or adjusting node configuration to require verification of work before storing chains.

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2019-25220

Affected Products

Bitcoin Core

References · 7

• https://bitcoincore.org/en/2024/09/18/disclose-headers-oom · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-25220 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-25220 · Security Note
• https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html · Note
• https://t.me/cvenotify/101947 · Telegram Post
• https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures · Note
• https://t.me/cvedetector/11276 · Telegram Post