CVE-2024-45040

Description

gnark is a fast zk-SNARK library that offers a high-level API to design circuits. Prior to version 0.11.0, commitments to private witnesses in Groth16 as implemented break the zero-knowledge property. The vulnerability affects only Groth16 proofs with commitments. Notably, PLONK proofs are not affected. The vulnerability affects the zero-knowledge property of the proofs - in case the witness (secret or internal) values are small, then the attacker may be able to enumerate all possible choices to deduce the actual value. If the possible choices for the variables to be committed is large or there are many values committed, then it would be computationally infeasible to enumerate all valid choices. It doesn't affect the completeness/soundness of the proofs. The vulnerability has been fixed in version 0.11.0. The patch to fix the issue is to add additional randomized value to the list of committed value at proving time to mask the rest of the values which were committed. As a workaround, the user can manually commit to a randomized value.

Reserved 2024-08-21 | Published 2024-09-06 | Updated 2024-09-06 | Assigner GitHub_M

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

< 0.11.0
affected

References

github.com/.../gnark/security/advisories/GHSA-9xcg-3q8v-7fq6

github.com/Consensys/gnark/pull/1245

github.com/...ommit/afda68a38acca37becb8ba6d8982d03fee9559a0

cve.org (CVE-2024-45040)

nvd.nist.gov (CVE-2024-45040)

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