CVE-2021-43569

The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : 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://github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2	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-dotnet:1.3.2:*:*:*:*:*:*:*

History

12 Nov 2021, 20:01

Type	Values Removed	Values Added
New CVE

Information

Published : 2021-11-09 22:15

Updated : 2024-02-04 22:08

NVD link : CVE-2021-43569

Mitre link : CVE-2021-43569

CVE.ORG link : CVE-2021-43569

JSON object : View

Products Affected

starkbank

ecdsa-dotnet

CWE

CWE-347

Improper Verification of Cryptographic Signature

{"id": "CVE-2021-43569", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2021-11-09T22:15:07.597", "references": [{"url": "https://github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages."}, {"lang": "es", "value": "La funci\u00f3n verify de Stark Bank .NET ECDSA library (ecdsa-dotnet) versi\u00f3n 1.3.1, no comprueba que la firma sea distinta de cero, que permite a atacantes falsificar firmas en mensajes arbitrarios"}], "lastModified": "2021-11-12T20:01:40.840", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:starkbank:ecdsa-dotnet:1.3.2:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "059EAC36-6FD5-41DA-926F-DFCD866CEE46"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}