Libra-related Sui network quietly fixes a bug that could have cost “billions of dollars.”
Some developers favor Move smart contract language because its security features specifically benefit blockchains. For example, it allows developers to create custom data types, including a “coin” type that cannot be copied or deleted.Like other blockchain networks, Sui does not store code in the same language it is written in. Instead, it converts this code from the network’s human-readable language to machine-readable bytecode.
In making this translation, Sui runs a series of verifications to ensure the translated code does not violate the security properties of the network. For example, it ensures that coins can’t be deleted or copied. According to Zellic’s explanatory blog post, it was hired by Mysten Labs to do a security assessment of this verifier program. It did not find a bug in the verifier itself. However, it found a bug in the “Control Flow Graph” or “CFG” file that the verifier uses to accomplish many of its tasks.
In its explanation, the team stated that the most obvious way this vulnerability could have been exploited is by malicious borrowers taking out flash loans. When flash loans are implemented on Move-based networks, the loan protocol usually sends the borrower an asset that cannot be deleted. If the borrower can delete this asset, they “could successfully take out a flash loan and not repay the borrowed funds,” the team said.
Move-based networks and their apps have been making waves in the fundraising world lately. A Sui-based decentralized exchange called Cetus
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