Attacker hijacks Tornado Cash governance via malicious proposal
Adding to the existing roadblocks of the decentralized crypto mixer Tornado Cash, an attacker managed to gain full control of the governance through a malicious proposal.
On May 20 at 3:25 ET, an attacker successfully granted 1.2 million votes to a malicious proposal. Given that the proposal received more than 700,000 legitimate votes, the attacker gained total control over Tornado Cash governance.
On 2023/05/20 at 07:25:11 UTC, Tornado Cash governance effectively ceased to exist. Through a malicious proposal, an attacker granted themselves 1,200,000 votes. As this is more than the ~700,000 legitimate votes, they now have full control.https://t.co/nY87XmrYgT pic.twitter.com/h9qjc3xRqz
As explained by @samczsun:
“Once the proposal was passed by voters, the attacker simply used the emergencyStop function to update the proposal logic to grant themselves the fake votes.”
As shown above, they also attempted deploying a contract that could potentially revert the changes while still suggesting the community to withdraw their funds. Cointelegraph also came across a distress call from one of Tornado Cash’s community developer who confirmed the above developments, stating:
Related: Allbridge offers bounty to exploiter who stole $573K in flash loan attack
A former Tornado Cash developer is reportedly working on building a new crypto mixing service from scratch, which addresses the “critical flaw” existing in Tornado Cash.
1/ We fixed @tornadocash
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