CVE-2019-14859
CRITICAL9.1EPSS 0.07%Improper Verification of Cryptographic Signature in Pure-Python ECDSA
Published: 4/1/2020Modified: 2/21/2025
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.
Affected packages (3)
- Debian/python-ecdsafrom 0, < 0.13.3-1
- PyPI/ecdsafrom 0, < 0.13.3
- PyPI/ecdsafrom 0, < 0.13.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
References (14)
- ADVISORYhttps://github.com/advisories/GHSA-8qxj-f9rh-9fg2
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2019-14859
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2019-14859
- PATCHhttps://github.com/warner/python-ecdsa
- PATCHhttps://pypi.org/project/ecdsa/0.13.3/
- WEBhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14859
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/ecdsa/PYSEC-2020-163.yaml
- WEBhttps://github.com/tlsfuzzer/python-ecdsa/commit/3427fa29f319b27898a28601955807abb44c0830
- WEBhttps://github.com/tlsfuzzer/python-ecdsa/commit/9080d1d5ac533da0de00466aaffb49bee808bb4e
- WEBhttps://github.com/tlsfuzzer/python-ecdsa/commit/b0ea52bb3aa9a16c9a4a91fdc0041edbfed10b31
- WEBhttps://github.com/warner/python-ecdsa/issues/114
- WEBhttps://github.com/warner/python-ecdsa/pull/115
- WEBhttps://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3
- WEBhttps://pypi.org/project/ecdsa/0.13.3