### [CVE-2019-7167](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-7167)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### 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.

### POC

#### Reference
- http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/JinBean/CVE-Extension