Smart contract attack examples

We will now analyze two of the main smart contract attacks performed on the Ethereum platform: the DAO attack and the Parity attack. Due to the DAO attack, carried out in June 2016, attackers were able to illegally subtract an amount of funds estimated at between 70 and 150 million USD, while with the Parity attack carried out in July 2017, they subtracted an amount of 30 million USD from Parity's multi-signature wallet.

So, let's start our analysis with the DAO attack, which is examined in the following section.

Analyzing the DAO attack

To carry out the DAO attack, the attacker exploited some bugs present in the original version of the splitDAO function, whose Solidity code is shown...