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Hackers target Binance Smart Chain
Transactions on the Binance Smart Chain, the leading crypto exchange, were halted early on October 8 after a security breach was discovered on its cross-chain bridge, BSC Token Hub, as per media reports. While initial estimates said that the hackers got away with stolen funds worth between $100 and $110 million, Binance CEO Changpeng Zhao has now taken to Twitter to confirm the incident, as he reassured the platform's users that their funds were safe.
"An exploit on a cross-chain bridge, BSC Token Hub, resulted in extra BNB. We have asked all validators to temporarily suspend BSC. The issue is contained now. Your funds are safe. We apologize for the inconvenience and will provide further updates accordingly," Changpeng Zhao tweeted.
According to Sam Sun, head of security at Paradigm, the hacker tricked the Binance Bridge into sending out 1 million BNB tokens (cryptocurrency coin powering the BNB Chain ecosystem). As the exploit worked, the hacker used the same method to send out an additional 1 million BNB tokens to an address controlled by the threat actors. The 2 million BNB tokens would be worth over $540 million, making it one of the largest exploits in crypto history. Blockchain security firm SlowMist has confirmed the figure in a tweet, while stating that the misappropriated assets included ETH, MATIC, BNB, AVA and other tokens.
As per a CNBC report, the actual extent of the hack is estimated to be considerably less due to the crypto community's mitigation and containment efforts. Network validators were also asked to temporarily suspend transactions on BSC, thwarting the hacker's efforts to transfer funds off-chain.
According to a blog post, the hacker was only able to transfer between $100 million-$110 million off-chains, of which "an estimated $7 million has already been frozen." The biggest relief is that the BSC users won't be affected by this cybercrime, as the stolen tokens didn't belong to them. This is the third attack on cross-chain bridges in 2022. Prior attacks saw $650 million and $100 million syphoned from the Ronin and Horizon bridges, respectively.
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