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How the CVE Works
The vulnerability arises due to a missing constraint in the `rv32im` circuit of RISC0-ZKVM (versions 2.0.0–2.0.2). A malicious prover can exploit this flaw by submitting specially crafted 3-register RISC-V instructions (e.g., remu, divu). The lack of proper constraints allows the attacker to trick the RISC-V virtual machine into treating the `rs1` and `rs2` registers as identical, leading to incorrect computations and potential security breaches. This could enable unauthorized proof validation, compromising the integrity of zero-knowledge virtual machine executions.
DailyCVE Form
Platform: RISC0-ZKVM
Version: 2.0.0–2.0.2
Vulnerability: Circuit Constraint Bypass
Severity: Critical
Date: 2023-XX-XX
Prediction: Patch expected 2023-XX-XX
What Undercode Say
Check risc0-zkvm version cargo tree | grep risc0-zkvm Mitigation command cargo update risc0-zkvm --precise 2.1.0 Verify circuit constraints risc0-verify --circuit rv32im
How Exploit
- Malicious prover crafts 3-register instructions.
- Bypasses
rs1/rs2register constraints. - Forces VM to compute incorrect results.
Protection from this CVE
- Upgrade to risc0-zkvm 2.1.0.
- Use official Verifier Router.
- Audit custom verifier contracts.
Impact
- Unauthorized proof validation.
- Compromised zkVM integrity.
- Smart contract manipulation.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
