Audit name:
[SCA] s6k | ERC20 | Mar2023
Date:
Apr 4, 2023
Table of Content
Introduction
We express our gratitude to the s6k Labs team for the collaborative engagement that enabled the execution of this Smart Contract Security Assessment.
s6k is a company dedicated to providing high-quality software solutions at extremely cost-effective prices and the best possible results.
| title | content |
|---|---|
| Platform | EVM |
| Language | Solidity |
| Tags | ERC20 |
| Timeline | 28/03/2023 - 05/04/2023 |
| Methodology | https://hackenio.cc/sc_methodology→ |
Review Scope | |
|---|---|
| Repository | https://gitlab.com/s6k-labs/s6k-token-contract→ |
| Commit | 9f55463c99daa4b731dc15bb2362a4156a81f38a |
Review Scope
- Commit
- 9f55463c99daa4b731dc15bb2362a4156a81f38a
Audit Summary
10/10
0%
8/10
9/10
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 s6k Labs |
| Audited By | Hacken |
| Website | https://www.s6klabs.com/→ |
| Changelog | 05/04/2023 - Initial Review |
Document
- Name
- Smart Contract Code Review and Security Analysis Report for s6k Labs
- Audited By
- Hacken
- Website
- https://www.s6klabs.com/→
- Changelog
- 05/04/2023 - Initial Review
System Overview
The scope of the S6k Labs audit consists of an ERC20 token that is Burnable and Pausable. The Burning functionality can be done by token holders and addresses that are approved by the token holders. The admin and pauser roles are defined in the system, which can transfer locked ERC20 tokens in the contract and pause, unpause transfers of the token respectively.
According to the documentation, the s6k Token will be used on a Launchpad platform for staking and receiving allocations on sales and as the main currency for s6k projects such as the marketplace.
The files in the scope:
s6kToken.sol_: The Burnable and Pausable ERC20 token of the system.
Privileged roles
DEFAULT_ADMIN_ROLE: Can transfer ERC20 tokens that are sent to the contract by mistake.
PAUSER_ROLE: Can pause, unpause transfer of tokens.
Recommendations
Lock the pragma version for best practice.
Use the external declaration in functions that are not accessed from within the contract.
Executive Summary
Documentation quality
The total Documentation quality score is 9 out of 10.
Functional requirements are provided.
Technical requirements are provided.
NatSpec is not provided.
Code quality
The total Code quality score is 8 out of 10.
The code follows Solidity Style Guides.
Unchecked transfer was used.
Floating pragma is used.
Test coverage
Code coverage of the project is 0% (branch coverage).
Tests are not provided but do not affect the score because the Lines of Code of the scope are less than 250.
Security score
Upon auditing, the code was found to contain 0 critical, 0 high, 0 medium, and 3 low severity issues. Out of these, 0 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 9.5. This score reflects the combined evaluation of documentation, code quality, test coverage, and security aspects of the project.
Risks
The PAUSER_ROLE in the s6kToken contract has highly permissive role access and can pause the transfer of tokens without any restrictions.
Findings
Code ― | Title | Status | Severity | |
|---|---|---|---|---|
| F-2023-0868 | Functions That Can Be Declared External | unfixed | Low | |
| F-2023-0867 | Floating Pragma | unfixed | Low | |
| F-2023-0866 | Unchecked Return Value | unfixed | 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://gitlab.com/s6k-labs/s6k-token-contract→ |
| Commit | 9f55463c99daa4b731dc15bb2362a4156a81f38a |
| Whitepaper | Not provided |
| Requirements | Provided |
| Technical Requirements | Provided |
Scope Details
- Commit
- 9f55463c99daa4b731dc15bb2362a4156a81f38a
- Whitepaper
- Not provided
- Requirements
- Provided
- Technical Requirements
- Provided