CVE-2023-34459 (contracts, contracts_upgradeable) | allinfosecnews.com

June 16, 2023, 11:15 p.m. |

National Vulnerability Database web.nvd.nist.gov

OpenZeppelin Contracts is a library for smart contract development. Starting in version 4.7.0 and prior to version 4.9.2, when the `verifyMultiProof`, `verifyMultiProofCalldata`, `procesprocessMultiProof`, or `processMultiProofCalldat` functions are in use, it is possible to construct merkle trees that allow forging a valid multiproof for an arbitrary set of leaves.

A contract may be vulnerable if it uses multiproofs for verification and the merkle tree that is processed includes a node with value 0 at depth 1 (just under the root). This …

contract contracts cve development functions library may merkle smart smart contract trees valid version vulnerable

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