ETH_CALLtoken_audit_report.md

CALL token audit report.

1. Summary

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

2. In scope

Сommit hash .

• IERC664.sol.
• IERC777.sol.
• IERC777TokensRecipient.sol.
• IERC777TokensSender.sol.
• ERC664Balances.sol.
• SafeGuard.sol.
• ERC777.sol.
• ERC777ERC20Compat.sol.
• ERC777RemoteBridge.sol.
• CALL.sol.
• CStore.sol.

3. Findings

In total, 3 issues were reported including:

• 0 medium severity issues
• 1 low severity issues
• 2 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:

ERC664Balances.sol

Increase/decrease total supply, lines 58,68.

call.sol

Disable/enable all functions (transfer, trnsferFrom, approve) the ERC20 interface, line 40, 49.

4. Conclusion

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