CVE-2019-14859

python-ecdsa: DER encoding is not being verified in signatures

Published Jan 2, 2020 CVSS 3.1 · 9.1 Critical EPSS 1.5% KEV · Not listed
Description
A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-1978-1 python-ecdsa security update
Debian DSA Debian DSA DSA-4588-1 python-ecdsa security update
EUVD EUVD EUVD-2020-0076 A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions.
Github GHSA Github GHSA GHSA-8qxj-f9rh-9fg2 Improper Verification of Cryptographic Signature in Pure-Python ECDSA
Ubuntu USN Ubuntu USN USN-4196-1 python-ecdsa vulnerabilities
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Aug 5, 2024, 12:26 AM
Reserved
Aug 10, 2019, 12:00 AM
Status
Modified
Published
Jan 2, 2020, 3:15 PM
Modified
Jun 17, 2026, 2:19 AM
Severity
Moderate
Public date
Sep 25, 2019, 12:00 AM