CVE-2019-7167

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.51%
Vendor Advisory z.cash
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/ press/media coverage third party advisory
https://z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/ vendor advisory
https://github.com/JinBean/CVE-Extension

Frequently Asked Questions

What is the severity of CVE-2019-7167?
CVE-2019-7167 has been scored as a high severity vulnerability.
How to fix CVE-2019-7167?
To fix CVE-2019-7167, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-7167 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-7167 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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