lfwa/vulnerable-ethereum-contracts

Statically Analyse Ethereum Smart Contracts for Vulnerabilities

Static Taint Analysis for Ethereum Contracts

The analyzer detects vulnerable contracts that may be deleted from the blockchain and have all remaining cryptocurrency transferred to an untrusted address.

Repository Structure

• /peck: This directory contains a parser that transforms a Solidity contract into an intermediate representation (IR), and derives Datalog facts that encode the contract’s IR. Technical details on the IR and its representation in Datalog can be found in analyser/README-IR.md.
• analyser/: This directory contains the code for the static taint analyser and some test contracts. The analyser/analyze.dl and analyser/analyze.py are the main source files for the analysis.

Setup Instructions

The analyser requires python 3.7, solc 0.5.7 and souffle 1.5.1:

• Solidity: https://github.com/ethereum/solidity
• Graphviz: https://gitlab.com/graphviz/graphviz/
• Souffle: https://github.com/souffle-lang/souffle
• py-solc: https://github.com/ethereum/py-solc

Create a python virtual environment and install python dependencies.

$ python -m venv venv
$ source venv/bin/activate
$ pip install --upgrade pip
$ pip install -e .

Example Usage

Run analyser:

$ cd analyser
$ python analyze.py test_contracts/0.sol
Tainted

Inspect the contract’s control flow graph / Datalog representation:

$ python analyze.py --visualize test_contracts/0.sol
$ ls test_contract_out 
facts.pdf  graph.pdf