An unknown hacker stole about $560 million in BNB from the network’s cross-chain bridge, known as the BSC Token Hub, on Thursday. According to security firm SlowMist, the hacker shifted more than $100 million to other chains out of this total.
On BNB Chain, the perpetrator’s address owned about $430 million in BNB tokens.
The hacker used a security flaw to create security proofs that allowed him to extract the bridge’s locked cash. All withdrawal requests on the bridge required these documents.
In reaction to the vulnerability, the team shut down the blockchain, instructing all 44 validators (including 26 active validators) to cease activities. This was done to prevent the hacker from making any further changes and to reclaim control of monies that remained on the BNB Chain. The team stated:
“Decentralized chains are not designed to be stopped, but by contacting community validators one by one, we were able to stop the incident from spreading. It was not that easy as BNB Smart Chain has 26 active validators at present and 44 in total in different time zones. This delayed closure, but we were able to minimize the loss.”
While the BNB Chain has already prevented cash from being transferred from the hacker’s wallet, the project will have a governance vote to formalize the decision and make a final decision on what to do with those monies.
Furthermore, the BNB Chain governance will vote on publishing a bounty for finding hackers, with a payout of 10% of recovered assets. Finally, it revealed plans for a white hat bug bounty scheme, which would pay up to $1 million for each security flaw discovered on the BNB network, including the compromised bridge.
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Harold
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