Ethereum: the contract was violated – Understanding the problem
As a developer of intelligent agreements on Blockchain Ethereum, we have not extraneous to the potential risk relating to the implementation and interaction with external contracts. In this article, we deepen what went wrong in the case of a hacking contract that pulled the tokens from another contract.
Accident: Simplified version
Suppose that our contract was called “Myconttract”. Another intelligent agreement, designated as “contract”, has implemented a contract (also known as an event or function) and therefore called it. This event meant that our contract was caused by “Myconttract” and performed the functionality of this contract.
hack: symbolic extraction
When “Yourconttract” causes “Myconttract”, basically he pulls out token from “Myconttract”. These tokens were therefore separated and used by another harmful intelligent contract (let’s call it “HackerConttract”) in another blockchain network. HackerCtract would have performed the functionality of “Yourconttract”, which in turn influenced “Myconttract” to extract more token.
What went wrong
So what was wrong in this hack? Here are some key points:
* Lack of adequate authentication
: it seems that “your contract” had no way to verify the identity or authorizations of his contract. This susceptibility allows the attacker to use this lack of security.
* Earrated operation of events: the fact that a second contract has been convened and that the functionality of another contract was performed without adequate authentication, raises serious concerns about the credibility and integrity of the intelligent agreements at Ethereum .
* Taken extraction without permission: the separation of tokens from another contract is a serious violation of the conditions for the use of external bookstores or bees interfaces. This can lead to identity theft, unauthorized access or other harmful activities.
Reduction of risk
To prevent similar hats in the future:
* Implementation of appropriate authentication mechanisms: before interacting with them, check the identity of the contracts.
* Use Safe Events Operation practices: Make sure that events and functions are adequately authenticated and authorized to avoid involuntary consequences.
* Monitoring and Audit of intelligent contractual interactions: Parents regularly transactions and events to detect potential safety violations.
By understanding what went wrong in this case, we can better design our safe contracts and minimize the risk of similar hacks. As Ethereum programmers, it is necessary to maintain vigilance and adapt these rules to guarantee the integrity and reliability of our intelligent contract interactions.