ETH_IoTeX_audit_report.md

IoTeX audit report.

1. Summary

This document is a security audit report performed by danbogd, where IoTeX has been reviewed.

2. In scope

Сommit hash 13b1b1053529effce653deabfec427b70800eb42.

• Pausable.sol.
• SafeMath.sol.
• Ownable.sol.
• BasicToken.sol.
• ERC20.sol.
• ERC20Basic.sol.
• StandardToken.sol.
• IoTeXNetwork.sol.

3. Findings

In total, 2 issues were reported including:

• 0 medium severity issues
• 1 low severity issues
• 1 owner privileges (ability of owner to manipulate contract, may be risky for investors)..
• 0 notes.

No critical security issues were found.

3.1. Known vulnerabilities of ERC-20 token

Severity: low

Description

1. It is possible to double withdrawal attack. More details here.

2. Lack of transaction handling mechanism issue. WARNING! This is a very common issue and it already caused millions of dollars losses for lots of token users! More details here.

Recommendation

Add into a function transfer(address _to, ... ) following code:

require( _to != address(this) );

3.2. Owner Privileges

Severity: owner previliges

Description

Contract owner allow himself to:

to pause functions of contract (transfer, transferFrom, approve, increaseApproval, decreaseApproval) here.

4. Conclusion

The review did not show any critical issues, some of low severity issues were found.