CVE-2019-7167 Information

Description

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 Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/ https://github.com/JinBean/CVE-Extension https://z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5