CVE-2023-44378
The second decomposition was possible due to overflowing the field where the values are defined.
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
Description
gnark is a zk-SNARK library that offers a high-level API to design circuits. Prior to version 0.9.0, for some in-circuit values, it is possible to construct two valid decomposition to bits. In addition to the canonical decomposition of `a`, for small values there exists a second decomposition for `a+r` (where `r` is the modulus the values are being reduced by). The second decomposition was possible due to overflowing the field where the values are defined. Upgrading to version 0.9.0 should fix the issue without needing to change the calls to value comparison methods.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-191, CWE-697
- Affected
- consensys/gnark
- Source
- security-advisories@github.com
References
- https://github.com/Consensys/gnark/commit/59a4087261a6c73f13e80d695c17b398c3d0934fPatch
- https://github.com/Consensys/gnark/security/advisories/GHSA-498w-5j49-vqjgMitigation, Patch, Third Party Advisory
- https://github.com/zkopru-network/zkopru/issues/116Not Applicable
- https://github.com/Consensys/gnark/commit/59a4087261a6c73f13e80d695c17b398c3d0934fPatch
- https://github.com/Consensys/gnark/security/advisories/GHSA-498w-5j49-vqjgMitigation, Patch, Third Party Advisory
- https://github.com/zkopru-network/zkopru/issues/116Not Applicable
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.