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Enhanced Society Differential Analysis

Enhanced Society

26 May 2018

Introduction

iosiro was commissioned by Enhanced Society to analyse a pull request to identify potential functional and security flaws introduced into the codebase. The analysis was conducted between 24 May 2018 and 25 May 2018.

Description

The pull request was performed on a fork of the popular TokenMarket ICO Smart Contract Package. The codebase provides a boilerplate of smart contracts for projects wanting to launch an ICO.

Scope

The scope of the analysis was limited to changes made in PR #1. The specific commits are listed below.

Note: Only the code changes made by Enhanced Society detailed in the links provided above were analysed. The rest of the forked codebase was not assessed.

Analysis

A comprehensive list of changes to the smart contracts in scope is given below.

  • Changed the crowdsale fallback function to call investInternal(...) in Crowdsale.sol rather than throwing. This allows participants to send ether directly to the contract and receive tokens, instead of having to call the invest(...) function to purchase tokens.
  • Added functionality that required msg.sender and the token receiver address to be added to a whitelist before being able to contribute to the ICO. Only the crowdsale contract owner could call the whitelist functions.

Findings

No functional or security flaws were identified during the analysis.

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This is a limited report on our findings based on our analysis, in accordance with good industry practice as at the date of this report, in relation to: (i) cybersecurity vulnerabilities and issues in the smart contract source code analysed, the details of which are set out in this report, (Source Code); and (ii) the Source Code compiling, deploying and performing the intended functions. In order to get a full view of our findings and the scope of our analysis, it is crucial for you to read the full report. While we have done our best in conducting our analysis and producing this report, it is important to note that you should not rely on this report and cannot claim against us on the basis of what it says or doesn’t say, or how we produced it, and it is important for you to conduct your own independent investigations before making any decisions. We go into more detail on this in the below disclaimer below – please make sure to read it in full.

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