Vulnerability in Z.cash Zcash
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.
EPSS: 0.017 (74.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Z.cash Zcash
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Third Party Advisory, x_refsource_MISC, Press/Media Coverage)
- cve@mitre.org (x_refsource_MISC, Vendor Advisory)
- cve@mitre.org (x_refsource_MISC)
Frequently asked questions
- What is CVE-2019-7167?
- CVE-2019-7167 is a high-severity vulnerability in Z.cash Zcash, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2019-03-27.
- How severe is CVE-2019-7167?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-7167 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.