CVE-2025-52884 Information

Description

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.

Reference

https://docs.beboundless.xyz/developers/steel/how-it-works#verifying-the-proof-onchain https://github.com/risc0/risc0-ethereum/blob/ff0cb9253a87945b653b825711b8b5075f8b7545/examples/erc20-counter/contracts/src/Counter.sol#L56-L63 https://github.com/risc0/risc0-ethereum/commit/3bbac859c7132b21ba5fdf2d47f1dd52e7e73d98 https://github.com/risc0/risc0-ethereum/pull/605 https://github.com/risc0/risc0-ethereum/releases/tag/v2.1.1 https://github.com/risc0/risc0-ethereum/releases/tag/v2.2.0 https://github.com/risc0/risc0-ethereum/security/advisories/GHSA-gjv3-89hh-9xq2

Related CNNVD

CNNVD-202506-3129 (Published: 2025-06-24)