CVE-2019-7167

Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability. A key-generation process, during evaluation of polynomials related to a to-be-proven statement, produced certain bypass elements. Availability of these elements allowed a cheating prover to bypass a consistency check, and consequently transform the proof of one statement into an ostensibly valid proof of a different statement, thereby breaking the soundness of the proof system. This misled the original Sprout zk-SNARK verifier into accepting the correctness of a transaction.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

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

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/	Press/Media Coverage Third Party Advisory
https://github.com/JinBean/CVE-Extension
https://z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:z.cash:zcash:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2019-03-27 02:29

Updated : 2020-08-24 17:37

NVD link : CVE-2019-7167

Mitre link : CVE-2019-7167

CVE.ORG link : CVE-2019-7167

JSON object : View

Products Affected

z.cash

zcash

CWE

CWE-754

Improper Check for Unusual or Exceptional Conditions

{"id": "CVE-2019-7167", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2019-03-27T02:29:00.250", "references": [{"url": "http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/", "tags": ["Press/Media Coverage", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://github.com/JinBean/CVE-Extension", "source": "cve@mitre.org"}, {"url": "https://z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-754"}]}], "descriptions": [{"lang": "en", "value": "Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability. A key-generation process, during evaluation of polynomials related to a to-be-proven statement, produced certain bypass elements. Availability of these elements allowed a cheating prover to bypass a consistency check, and consequently transform the proof of one statement into an ostensibly valid proof of a different statement, thereby breaking the soundness of the proof system. This misled the original Sprout zk-SNARK verifier into accepting the correctness of a transaction."}, {"lang": "es", "value": "Zcash, antes de la actualizaci\u00f3n de la red Sapling (28/10/2018), ten\u00eda una vulnerabilidad de falsificaci\u00f3n. Un proceso generador de claves durante la evaluaci\u00f3n de polinomios relacionados con una instrucci\u00f3n por confirmar produc\u00eda ciertos elementos de omisi\u00f3n. La disponibilidad de estos elementos permit\u00eda que un \"prover\" falso omitiese una comprobaci\u00f3n de consistencia y, en consecuencia, transformase la prueba de una instrucci\u00f3n en una prueba ostensiblemente v\u00e1lida de una instrucci\u00f3n diferente, quebrantando as\u00ed la seguridad del sistema de pruebas. Esto hac\u00eda que el verificador Sprout zk-SNARK original aceptase que una transacci\u00f3n fuese correcta."}], "lastModified": "2020-08-24T17:37:01.140", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:z.cash:zcash:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EA26BB19-6E16-4B93-BADC-1859FE3AE39C", "versionEndIncluding": "2.0.1"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}