Skip to content

Instantly share code, notes, and snippets.

Forked from MrCrambo/
Created June 16, 2019 17:04
What would you like to do?


This is the report from a security audit performed on SelfKey by MrCrambo.

The audit focused primarily on the security of SelfKey smart contracts.

In scope



In total, 3 issues were reported including:

  • 0 high severity issues.

  • 1 medium severity issues.

  • 0 owner privilegies issues.

  • 2 low severity issues.

Security issues

1. Zero address checking

Severity: low


There are no zero address checking in functions makePayment and setAddress.

2. Making payment error

Severity: medium


In function makePayment if affiliate1Address is not zero address and affiliate2Address is zero address then affiliate1Address will receive tokens and affiliate2Address will not receive it. But if affiliate1Address is zero address and affiliate2Address is not zero address then both of them will not receive, but affiliate2Address should receive it.


Checking affiliate2Address for zero address should be outside of if statement which checks affiliate1Address for zero address.

3. Known vulnerabilities of ERC-20 token

Severity: low


  1. It is possible to double withdrawal attack. More details here
  2. Lack of transaction handling mechanism issue. More details here


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

require( _to != address(this) );


Smart contract contains medium severity issue.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment