CVE Vulnerability

CVE-2021-43572

The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

7.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.8 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/ Exploit Third Party Advisory
https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 Release Notes Third Party Advisory
https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f Patch Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:starkbank:ecdsa-python:*:*:*:*:*:*:*:*
Information

Published : 2021-11-09 10:15

Updated : 2022-03-24 03:57

NVD link : CVE-2021-43572

Mitre link : CVE-2021-43572

Products Affected
No products.
CWE
CWE-347

Improper Verification of Cryptographic Signature