GitHub Advisoryadvisory · PyPI
GHSA-8qxj-f9rh-9fg2 Improper Verification of Cryptographic Signature in Pure-Python ECDSA
CRITICAL
Official page ↗
- Aliases
- CVE-2019-14859
- Ecosystem
- PyPI
- Packages
- ecdsa
- Severity
- Critical
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-347
- Reviewed
- 2020-04-01
Affected packages
• PyPI ecdsa: < 0.13.3 → fixed in 0.13.3
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.
Related
Alias · CVE (1)
- CVE-2019-14859 A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. vulnerability
Weakness · CWE (1)
- CWE-347 Improper Verification of Cryptographic Signature weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2019-14859 advisory
- https://github.com/warner/python-ecdsa/issues/114 web
- https://github.com/warner/python-ecdsa/pull/115 web
- https://github.com/tlsfuzzer/python-ecdsa/commit/3427fa29f319b27898a28601955807abb44c0830 web
- https://github.com/tlsfuzzer/python-ecdsa/commit/9080d1d5ac533da0de00466aaffb49bee808bb4e web
- https://github.com/tlsfuzzer/python-ecdsa/commit/b0ea52bb3aa9a16c9a4a91fdc0041edbfed10b31 web
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14859 web
- https://github.com/advisories/GHSA-8qxj-f9rh-9fg2 advisory
- https://github.com/pypa/advisory-database/tree/main/vulns/ecdsa/PYSEC-2020-163.yaml web
- https://github.com/warner/python-ecdsa package
- https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3 web
- https://pypi.org/project/ecdsa/0.13.3 web