4min chapter

Good Game cover image

$100M+ Crypto Hacks: A History of Black Hat Web3 Tactics | EP 13

Good Game

CHAPTER

The Unsafe External Calls Attack

There's many logic within smart contracts that could help and allow malicious attackers to find ways to trick the contract into giving you money. The re-entrancy attack or the infinite loop attack is an example of this type of vulnerability. And basically, what I've learned is that the check should happen before the transfer, not after the transfer. So the wallet should check, the DAO should check before they actually make the transfer happen.

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