Preface: Blockchain protocols are regulations and guidelines followed to achieve its decentralized and distributed nature, to ensure secure transactions, and more. There are three basic types of blockchain: public blockchain, consortium blockchain and private blockchain.

Background: RigoBlock is a blockchain protocol that makes it possible for anyone to set up and run a digital token pool. It is an open protocol which developers can use for building their own applications for token management.

Vulnerability details: RigoBlock has been hacked. All tokens in Dragos except ETH and USDT are at risk due to protocol vulnerabilities being exploited. The hacker, “Whitehat”, has returned funds to the affected RigoBlock pool, leaving only 10% of the bug bounty reward.

In RigoBlock Dragos, all versions as of 2022-02-17 and later (until a major protocol update is accomplished) contain an exposed function (CWE-749), specifically setMultipleAllowances() which was not set to onlyOwner. The setMultipleAllowances() function can be to manipulate tokens with the contract.

Ref: CWE-749: Exposed Dangerous Method or Function
The software provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.

Reminder: Blockchain protocols are regulations and guidelines followed to achieve its decentralized and distributed nature, to ensure secure transactions, and more. If it require a major protocol upgrade to fix the design weakness. Before it fixed, you should consider not to use in the moment.