The flaw could have allowed an attacker to call the publish_event, potentially tricking the protocol into minting unbacked tokens.
A flaw in the bridge could have allowed an attacker to produce fake token transfers, but it was discovered and patched before anyone could take advantage of it.
Aptos is a blockchain network that uses the MOVE programming language, which was originally developed by Facebook for the Libra project. Supporters of MOVE claim that it is a safer language to write smart contracts when compared to Ethereum’s Solidity or other alternatives. The bridge contained a function called ‘publish_event,” which was used to announce events such as token transfers. It was only supposed to be callable by other functions within the same module or by certain “specified external entities.” However, in the version of the bridge that CertiK studied, the function was modified by both ‘public’ and ‘entry.’ This made it possible for anyone to call ‘publish_event,” even if they were not an approved caller.
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