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Web3 infrastructure firm Jump Crypto has discovered a vulnerability in the BNB Beacon Chain, which would allow the mint of an unlimited amount of arbitrary tokens. The issue was privately disclosed to the BNB team, enabling a patch to be developed and deployed within 24 hours.<\/p>\n
In a blog<\/a> post from Feb. 10, Jump Crypto\u00a0disclosed a detailed report about the vulnerability found two days earlier, which could \u201chave led to a large loss of funds.\u201c <\/p>\n As per the report, the BNB Chain comprises two blockchains: The Ethereum Virtual Machine-compatible Smart Chain, based on a fork of go-ethereum and the Beacon Chain, built on top of Tendermint and Cosmos SDK. <\/p>\n However, the Beacon Chain uses a BNB fork hosted on GitHub with several BNB-specific changes. \u201cIt deviates from the Cosmos SDK upstream in several ways, motivating us to take extra care in reviewing the differences,\u201d notes Jump Crypto, which recently started a broad research effort dedicated to discovering and patching vulnerabilities across projects via coordinated disclosure.<\/p>\n The vulnerability would allow an attacker to mint an almost unlimited amount of BNB tokens via a malicious transfer, meaning that destination accounts would receive a much larger number of BNB tokens than the sender initially provided. Jump Crypto noted:<\/p>\n \u201cBugs that allow infinite minting of native assets are some of the most critical vulnerabilities in Web3. As such, this finding is proof that we all must stay vigilant and collaborate to elevate security assurances across all projects. \u201c<\/p><\/blockquote>\n The BNB team fixed the issue by switching to overflow-resistant arithmetic methods for the SDK coin type. The patch will result in a golang panic and a transaction failure if the coin calculation overflows.<\/p>\n BNB Chain is the native blockchain behind the crypto exchange Binance. The company CEO, Changpeng Zhao, thanked Jump Crypto\u2019s team for reporting the bug on Twitter: <\/p>\n Many thanks to @jump_<\/a> for reporting this bug. They got a great security team. Really appreciate it. https:\/\/t.co\/bqidp5X3Y2<\/a><\/p>\n \u2014 CZ Binance (@cz_binance) February 10, 2023<\/a><\/p><\/blockquote>\n In October 2022, the BNB Chain\u00a0was briefly suspended<\/a> after a cross-chain exploit compromised nearly $80 million worth of cryptocurrency. The genesis of the breach took place on the BSC Token Hub, eventually resulting in the creation of an \u201cextra BNB,\u201d\u00a0shows<\/a>\u00a0an official post on Reddit.\u00a0<\/p>\n<\/div>\n\n