CVE-2021-41153 : Security Advisory and Response

The evm crate, a Rust implementation of Ethereum Virtual Machine, has a high severity security advisory due to specification non-compliance in the JUMPI opcode.

Understanding CVE-2021-41153

The vulnerability affects users of the

evm

crate with versions below 0.31.0, impacting the condition check order of the

JUMPI

opcode.

What is CVE-2021-41153?

The issue arises from a discrepancy in the order of condition checks in the

JUMPI

opcode within the

evm

crate, impacting Ethereum mainnet users and requiring an immediate library dependency update.

The Impact of CVE-2021-41153

Severity: High
CVSS Base Score: 8.7
Attack Vector: Network
Impact: High impact on confidentiality and integrity
Scope: Changed control flow implementation

Technical Details of CVE-2021-41153

The technical aspects of the vulnerability are crucial in understanding its implications and mitigating risks.

Vulnerability Description

The issue occurs in the incorrect order of condition checks in the

JUMPI

opcode in versions below 0.31.0 of the

evm

crate.

Affected Systems and Versions

Affected Product: evm
Vendor: rust-blockchain
Versions Affected: < 0.31.0

Exploitation Mechanism

The vulnerability allows for potential security exploits in the Ethereum mainnet, impacting control flow implementation.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are essential in safeguarding systems.

Immediate Steps to Take

Update the

evm

crate dependency to version 0.31.0 or later.
Follow chain upgrade preparations diligently.

Long-Term Security Practices

Regularly monitor for security advisories and updates.
Ensure compliance with Ethereum chain upgrades.

Patching and Updates

Stay informed about security patches and maintain a robust update process.