Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Consensys / gnark | affected < 0.9.0 |
CWE
CWE-191, CWE-697
References
- https://github.com/Consensys/gnark/security/advisories/GHSA-498w-5j49-vqjg
- https://github.com/zkopru-network/zkopru/issues/116
- https://github.com/Consensys/gnark/commit/59a4087261a6c73f13e80d695c17b398c3d0934f
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.