CVE-2021-43572

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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.

9.8 /10

CVSS v3 : 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

7.5 /10

CVSS v2.0 : HIGH

V2 Legend

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

Configuration 1 (hide)

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

24 Mar 2022, 15:57

Type Values Removed Values Added
References (MISC) https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f - (MISC) https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f - Patch, Third Party Advisory

20 Feb 2022, 16:15

Type Values Removed Values Added
References
  • (MISC) https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f -
Summary The verify function in the Stark Bank Python ECDSA library (ecdsa-python) 2.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages. 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.

17 Feb 2022, 15:48

Type Values Removed Values Added
References (MISC) https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 - Third Party Advisory (MISC) https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 - Release Notes, Third Party Advisory
CPE cpe:2.3:a:starkbank:ecdsa-python:2.0.0:*:*:*:*:*:*:* cpe:2.3:a:starkbank:ecdsa-python:*:*:*:*:*:*:*:*

12 Nov 2021, 20:00

Type Values Removed Values Added
CPE cpe:2.3:a:starkbank:ecdsa-python:2.0.0:*:*:*:*:*:*:*
CWE CWE-347
CVSS v2 : unknown
v3 : unknown 		v2 : 7.5
v3 : 9.8
References (MISC) https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/ - (MISC) https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/ - Exploit, Third Party Advisory
References (MISC) https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 - (MISC) https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 - Third Party Advisory

09 Nov 2021, 22:15

Type Values Removed Values Added
New CVE
Information

Published : 2021-11-09 22:15

Updated : 2023-12-10 14:09

NVD link : CVE-2021-43572

Mitre link : CVE-2021-43572

CVE.ORG link : CVE-2021-43572

JSON object : View

Products Affected

starkbank

  • ecdsa-python
CWE
CWE-347

Improper Verification of Cryptographic Signature