CVE-2025-52884
risc0-ethereum-contracts allows invalid commitment with digest value of zero to be accepted by Steel.validateCommitment
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risc0-ethereum-contracts allows invalid commitment with digest value of zero to be accepted by Steel.validateCommitment
RISC Zero is a zero-knowledge verifiable general computing platform, with Ethereum integration. The risc0-ethereum repository contains Solidity verifier contracts, Steel EVM view call library, and supporting code. Prior to versions 2.1.1 and 2.2.0, the `Steel.validateCommitment` Solidity library function will return `true` for a crafted commitment with a digest value of zero. This violates the semantics of `validateCommitment`, as this does not commitment to a block that is in the current chain. Because the digest is zero, it does not correspond to any block and there exist no known openings. As a result, this commitment will never be produced by a correct zkVM guest using Steel and leveraging this bug to compromise the soundness of a program using Steel would require a separate bug or misuse of the Steel library, which is expected to be used to validate the root of state opening proofs. A fix has been released as part of `risc0-ethereum` 2.1.1 and 2.2.0. Users for the `Steel` Solidity library versions 2.1.0 or earlier should ensure they are using `Steel.validateCommitment` in tandem with zkVM proof verification of a Steel program, as shown in the ERC-20 counter example, and documentation. This is the correct usage of Steel, and users following this pattern are not at risk, and do not need to take action. Users not verifying a zkVM proof of a Steel program should update their application to do so, as this is incorrect usage of Steel.
Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner GitHub_MCWE-159: Improper Handling of Invalid Use of Special Elements
github.com/...hereum/security/advisories/GHSA-gjv3-89hh-9xq2
github.com/risc0/risc0-ethereum/pull/605
github.com/...ommit/3bbac859c7132b21ba5fdf2d47f1dd52e7e73d98
docs.beboundless.xyz/developers/steel/how-it-works
github.com/...amples/erc20-counter/contracts/src/Counter.sol
github.com/risc0/risc0-ethereum/releases/tag/v2.1.1
github.com/risc0/risc0-ethereum/releases/tag/v2.2.0
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