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Libra-related Sui blockchain fixes critical bug that put ‘billions’ at risk

Libra-related Sui blockchain fixes critical bug that put ‘billions’ at risk


The Sui blockchain network quietly fixed a bug that could have put “billions of dollars” at risk, according to a May 16 announcement from Zellic, the security firm hired to audit the network’s security.

The bug was in a dependency of the bytecode verifier, which ensures that the human-readable Move language used to write smart contracts on Sui is correctly transcribed into machine code during deployment. Had the bug not been fixed, it could have “allowed attackers to bypass multiple security properties, leading to potentially significant financial damages,” the announcement said.

According to the announcement, Sui developer Mysten Labs fixed the bug on March 30, in commit 8bddbe65, after Zellic informed them of its existence. The bug may have also been present in other Move-based networks, including Aptos and Starcoin. The Aptos version of the bug was eliminated with a patch on April 10, according to the Zellic team.

In a conversation with Cointelegraph, a representative from the Move-based 0L network stated that the bug does not affect its version of Move. On May 15, 0L added a series of tests to their GitHub, which it says proves the exploit is not possible on the 0L version.

Cointelegraph reached out to Aptos and Starcoin for comment but did not receive a response by publication.

A blockchain network developed by Mysten Labs, Sui was founded by former Meta Platforms engineers. It’s a fork of the open-source Libra project created by Facebook-parent Meta. Libra was shut down in 2019.

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.

Related: Justin Sun issues apology after Sui LaunchPool clashes with Binance CEO

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…

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