bitcoin: CVE-2021-31876

Debian Bug report logs - #1014166
bitcoin: CVE-2021-31876

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Moritz Mühlenhoff <jmm@inutil.org>

To: submit@bugs.debian.org

Subject: bitcoin: CVE-2021-31876

Date: Fri, 1 Jul 2022 14:43:10 +0200

Source: bitcoin
X-Debbugs-CC: team@security.debian.org
Severity: grave
Tags: security

Hi,

The following vulnerability was published for bitcoin.

CVE-2021-31876[0]:
| Bitcoin Core 0.12.0 through 0.21.1 does not properly implement the
| replacement policy specified in BIP125, which makes it easier for
| attackers to trigger a loss of funds, or a denial of service attack
| against downstream projects such as Lightning network nodes. An
| unconfirmed child transaction with nSequence = 0xff_ff_ff_ff, spending
| an unconfirmed parent with nSequence <= 0xff_ff_ff_fd, should be
| replaceable because there is inherited signaling by the child
| transaction. However, the actual PreChecks implementation does not
| enforce this. Instead, mempool rejects the replacement attempt of the
| unconfirmed child transaction.

https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures#CVE-2021-31876
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-May/018893.html


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-31876
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31876

Please adjust the affected versions in the BTS as needed.

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