More than two years after the collapse of The DAO thrust the Ethereum community into civil war, one of the bugs that caused that caused that black swan event continues to lurk in many smart contracts, waiting to be exploited by hackers.
That’s according to Emin Gün Sirer, a computer science professor at Cornell and the co-director of cryptocurrency research initiative IC3, who said that he has seen a variety of smart contracts that may be vulnerable to a “reentrancy” attack that allows a malicious user to drain ETH from a payment channel.
https://www.ccn.com/ethereum-we-havent-seen-the-last-of-the-bug-that-killed-the-dao/
