Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLThxeGotZjlyaC05Zmcy

Improper Verification of Cryptographic Signature in Pure-Python ECDSA

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.

Permalink: https://github.com/advisories/GHSA-8qxj-f9rh-9fg2
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLThxeGotZjlyaC05Zmcy
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 4 years ago
Updated: 23 days ago

CVSS Score: 9.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Identifiers: GHSA-8qxj-f9rh-9fg2, CVE-2019-14859
References:

• https://nvd.nist.gov/vuln/detail/CVE-2019-14859
• https://github.com/warner/python-ecdsa/issues/114
• https://github.com/warner/python-ecdsa/pull/115
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14859
• https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3
• https://github.com/tlsfuzzer/python-ecdsa/commit/3427fa29f319b27898a28601955807abb44c0830
• https://github.com/tlsfuzzer/python-ecdsa/commit/9080d1d5ac533da0de00466aaffb49bee808bb4e
• https://github.com/tlsfuzzer/python-ecdsa/commit/b0ea52bb3aa9a16c9a4a91fdc0041edbfed10b31
• https://github.com/advisories/GHSA-8qxj-f9rh-9fg2
• https://github.com/pypa/advisory-database/tree/main/vulns/ecdsa/PYSEC-2020-163.yaml
• https://pypi.org/project/ecdsa/0.13.3

Repository: https://github.com/warner/python-ecdsa
Blast Radius: 38.1

Affected Packages