CVE-2019-7167
Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 2.18% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-754
- Affected
- z.cash/zcash
- Source
- cve@mitre.org
References
- 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
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.