Vulnerability research | Fuzzing | Reversing | WebAssembly | Ethereum
2020/03/03 @ EthCC 2020
In this talk, I briefly introduce WebAssembly concepts , Ewasm specificity and opcodes/instructions. Secondly, I show how to create Ewasm smart contract and expose different techniques/tools to perform WebAssembly module closed-source analysis. Finally, we go through some basic examples to apply reversing (reverse engineering) on those Ewasm contracts and understand the logic inside.
2019/10/22 @ Hack.lu 2019
In this workshop, I will first introduce WebAssembly concepts and why it’s consider as a “game changer for the web”. Secondly, I will expose how to analyze a WebAssembly module using different techniques (static & dynamic) as well as some open-source tools that make you the life easier (Octopus, Wasabi, …). Finally, we will hands-on with simple examples/crackmes and finally go throws the analysis of cryptominers.
The following point will be discussed in this workshop.
link / slides / repository
2019/05/21 @ Northsec 2019
In this workshop, I will first introduce WebAssembly concepts and why it’s consider as a “game changer for the web”. Secondly, I will expose different techniques (Static/Dynamic analysis) and tools (Octopus, Wasabi, …) to perform a WebAssembly module analysis. Finally, we will hands-on with basic examples (crackmes) and go throws some real-life cryptominer and web-browsers plugins using WebAssembly module.
Along the talk, I will only used open source tools.
link / slides (not yet) / repository
2019/01/21 @ Geneva Annual Blockchain Congress 2019
Ethereum is one of the top5 cryptocurrency on the market cap and the major public smart contract platform. This position is due partially to the possibility to create decentralized applications (Dapps) by writing smart contracts. The Solidity source code can contains flaws (reentrancy, integer overflow/underflow, bad randomness, backdoor, …) and it’s important to keep security in mind when developing smart contracts.
After this workshop delivered by Quoscient, attendees will be able to create simple Ethereum smart contract, upload and interact with them on the blockchain.
We will also discuss about major security flaws/vulnerabilities that have occurred on the Ethereum main-net and how to prevent them from a developer point of view.
The following points will be covered in the workshop:
slides
2018/11/08 @ BlackAlps 2018
Ethereum is the reference of smart contract platform due to the possibility to create decentralized applications (Dapps) by writing smart contracts. The Solidity source code of those smart contracts are not always available and can contains flaws (reentrancy, integer overflow/underflow, bad randomness, backdoor, ….). Some smart contract handle thousand of ETH and can’t be modified once pushed into the blockchain. More than 90% of them doesn’t provide the associated Solidity source code and that’s also why be able to reverse and analyze Ethereum smart contract (only with the EVM bytecode) make even more sense.
This workshop is intended to bring attendees the basic skills (theoretical and practical) to analyze Ethereum smart contracts. After the workshop, they will be able to reverse, debug and find basic vulnerabilities into real-life smart contracts without having the Solidity source code.
The following points will be covered in the workshop:
2018/10/18 @ hack.lu 2018
This workshop is intended to bring attendees the basic skills (theoretical and practical) to analyze Ethereum smart contracts. After the workshop, they will be able to reverse, debug and find basic vulnerabilities into real-life smart contracts without having the Solidity source code.
The following points will be covered in the workshop: