Rubic lost $1.4M on December 25, 2022 when USDC was mistakenly added to the router whitelist and routerCallNative lacked input validation. Attacker exploited user pre-approvals to RubicProxy by calling arbitrary contracts, draining USDC directly from user wallets.

The multi-chain exchange protocol Rubic was hacked and lost more than $1.4 million. The attacker has transferred 1,100 ETH to the Tornado Cash mixing protocol. According to the analysis of the SlowMist security team, the root cause of the attack is that the Rubic protocol wrongly added USDC tokens to the Router whitelist, resulting in the theft of USDC tokens of users authorized to the RubicProxy contract.