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.

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

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

7.5^/10

CVSS v2.0 : HIGH

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

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

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

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Configurations

Configuration 1 (hide)

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

Information

Published : 2021-11-09 14:15

Updated : 2022-03-24 08:57

NVD link : CVE-2021-43572

Mitre link : CVE-2021-43572

JSON object : View

CWE

CWE-347

Improper Verification of Cryptographic Signature

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Products Affected

starkbank

ecdsa-python

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