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- [SCA] Wrapped Millix | Bridge + ERC20 | Mar2023
Audit name:
[SCA] Wrapped Millix | Bridge + ERC20 | Mar2023
Date:
Mar 2, 2023
Table of Content
Introduction
We express our gratitude to the Wrapped Millix team for the collaborative engagement that enabled the execution of this Smart Contract Security Assessment.
Millix is an open source and fully decentralized cryptocurrency project. Designed for simplicity, transacts at very high speed and very large scale.
| title | content |
|---|---|
| Platform | Ethereum |
| Language | Solidity |
| Tags | ERC20 |
| Timeline | 10/02/2023 - 01/03/2023 |
| Methodology | https://hackenio.cc/sc_methodology→ |
Review Scope | |
|---|---|
| Repository | https://github.com/millix/millix-bridge-contract→ |
| Commit | 76a2dc84776e9881423bde9033f6f03fad385518 |
Review Scope
- Commit
- 76a2dc84776e9881423bde9033f6f03fad385518
Audit Summary
10/10
66.67%
10/10
10/10
The system users should acknowledge all the risks summed up in the risks section of the report
Document Information
This report may contain confidential information about IT systems and the intellectual property of the Customer, as well as information about potential vulnerabilities and methods of their exploitation.
The report can be disclosed publicly after prior consent by another Party. Any subsequent publication of this report shall be without mandatory consent.
Document | |
|---|---|
| Name | Smart Contract Code Review and Security Analysis Report for Wrapped Millix |
| Audited By | Hacken |
| Website | https://millix.org/→ |
| Changelog | 14/02/2023 – Initial Review |
| 01/03/2023 – Second Review |
Document
- Name
- Smart Contract Code Review and Security Analysis Report for Wrapped Millix
- Audited By
- Hacken
- Website
- https://millix.org/→
- Changelog
- 14/02/2023 – Initial Review
- 01/03/2023 – Second Review
System Overview
Millix is a ERC20 token with the following contract:
WrappedMillix — simple ERC-20 token with additional features, including pause and resume, minting and burning, and vesting restrictions. It has the following attributes:
Name: WrappedMillix.
Symbol: WMLX.
Decimals: 1.
Total supply: 9,000,000,000,000,000 WMLX (nine quadrillion) tokens.
Privileged roles
The owner of the WrappedMillix contract can pause, unpause the contract, and stop transfer, burn, mint processes for specific address or for all addresses.
Executive Summary
Documentation quality
The total Documentation quality score is 10 out of 10.
Functional requirements are provided.
Technical description is provided.
Code quality
The total Code quality score is 10 out of 10.
The development environment is configured.
The code follows the Solidity style guides.
Test coverage
Code coverage of the project is 66.67% (branch coverage).
Deployment and basic user interactions are covered with tests.
Interactions by several users are not tested thoroughly.
Negative cases coverage is missed.
Security score
Upon auditing, the code was found to contain 0 critical, 2 high, 5 medium, and 2 low severity issues. Out of these, 9 issues have been addressed and resolved, leading to a security score of 10 out of 10.
All identified issues are detailed in the “Findings” section of this report.
Summary
The comprehensive audit of the customer's smart contract yields an overall score of 10. This score reflects the combined evaluation of documentation, code quality, test coverage, and security aspects of the project.
Findings
Code ― | Title | Status | Severity | |
|---|---|---|---|---|
| F-2023-1436 | Highly Permissive Role Access | fixed | High | |
| F-2023-1435 | Requirements Violation | fixed | High | |
| F-2023-144 | Best Practice Violation | fixed | Medium | |
| F-2023-144 | Missing Events | fixed | Medium | |
| F-2023-143 | Best Practice Violation | fixed | Medium | |
| F-2023-1438 | Tautology | fixed | Medium | |
| F-2023-1437 | Contradiction | fixed | Medium | |
| F-2023-1443 | Missing Empty String Check | fixed | Low | |
| F-2023-144 | Floating Pragma | fixed | Low |
Appendix 1. Severity Definitions
When auditing smart contracts, Hacken is using a risk-based approach that considers Likelihood, Impact, Exploitability and Complexity metrics to evaluate findings and score severities.
Reference on how risk scoring is done is available through the repository in our Github organization:
Severity | Description |
|---|---|
Critical | Critical vulnerabilities are usually straightforward to exploit and can lead to the loss of user funds or contract state manipulation. |
High | High vulnerabilities are usually harder to exploit, requiring specific conditions, or have a more limited scope, but can still lead to the loss of user funds or contract state manipulation. |
Medium | Medium vulnerabilities are usually limited to state manipulations and, in most cases, cannot lead to asset loss. Contradictions and requirements violations. Major deviations from best practices are also in this category. |
Low | Major deviations from best practices or major Gas inefficiency. These issues will not have a significant impact on code execution, do not affect security score but can affect code quality score. |
Severity
- Critical
Description
- Critical vulnerabilities are usually straightforward to exploit and can lead to the loss of user funds or contract state manipulation.
Severity
- High
Description
- High vulnerabilities are usually harder to exploit, requiring specific conditions, or have a more limited scope, but can still lead to the loss of user funds or contract state manipulation.
Severity
- Medium
Description
- Medium vulnerabilities are usually limited to state manipulations and, in most cases, cannot lead to asset loss. Contradictions and requirements violations. Major deviations from best practices are also in this category.
Severity
- Low
Description
- Major deviations from best practices or major Gas inefficiency. These issues will not have a significant impact on code execution, do not affect security score but can affect code quality score.
Appendix 2. Scope
The scope of the project includes the following smart contracts from the provided repository:
Scope Details | |
|---|---|
| Repository | https://github.com/millix/millix-bridge-contract→ |
| Commit | 76a2dc84776e9881423bde9033f6f03fad385518 |
| Whitepaper | Provided→ |
| Requirements | Provided→ |
| Technical Requirements | Provided→ |