CVE-2019-14859

critical

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.

References

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/warner/python-ecdsa/issues/114

https://pypi.org/project/ecdsa/0.13.3/

Details

Source: MITRE

Published: 2020-01-02

Updated: 2021-08-04

Type: CWE-347

Risk Information

CVSS v2

Base Score: 6.4

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N

Impact Score: 4.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 9.1

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

Impact Score: 5.2

Exploitability Score: 3.9

Severity: CRITICAL