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Tornado Cash: a hacker takes control of governance after a malicious proposal

Nicholas by Nicholas
May 21, 2023
in Crypto
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Tornado Cash: a hacker takes control of governance after a malicious proposal

A hacker has managed to take control of the governance of the Tornado Cash mixer through a malicious proposal. Will this event cause the end of the protocol?

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Tornado Cash : un hacker prend le contrôle de la gouvernance après une proposition malveillante

Tornado Cash Governance Undergoes a Hack

It was an original attack to say the least that hit the Tornado Cash protocol this weekend. Indeed, a hacker managed to take control of governance, thanks to a malicious proposal. In a Twitter thread, Paradigm researcher @samczsun explained how the events unfolded:

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

— @samczsun.com (@samczsun) May 20, 2023

The procedure is quite technical, but let’s try to summarize it simply and explain the consequences. First, the proposal would have been similar to a previously adopted proposal, except that it contained a function that, once validated by governance, allowed the attacker to modify critical points to give himself fake votes.

Thus, the hacker was able to grant himself 1,200,000 votes while the governance had about 700,000 legitimate ones. As a result, this action then given control over said governancefor example opening the way to the theft of TORN tokens which were notably deposited in the polls of this one.

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Is this the end of the protocol?

While Tornado Cash had already seen its sustainability take a hit after the Office of Foreign Assets Control (OFAC) sanctions in August 2022, this new pitfall again puts the protocol at risk, at least in its form. current.

Note that a priori, deposit pools used to anonymize funds do not appear to be in danger. In fact, the PeckShield alerts account even noted that the hacker had himself used the application to launder the funds he had stolen, which includes, for example, around 380,000 TORN exchanged for 372 ETH:

#PeckshieldAlert Tornado Cash Governance Exploiter has deposited 6K $TORN to #Bitrue. And swapped ~380K $TORN for $ETH and then transferred 372 $ETH into Tornado Cashhttps://t.co/3fEa1kYFaz pic.twitter.com/BzqagupO5c

—PeckShieldAlert (@PeckShieldAlert) May 21, 2023

According to MistTrack, SlowMist’s on-chain tracking unit, more than 483,000 TORNs were stolen in the attack:

💸 The remaining $TORN was exchanged for ETH using @1inch and then deposit into https://t.co/FRBMx1wIMz

Hacker Address: https://t.co/TT9DItDB6T

— MistTrack🕵️ (@MistTrack_io) May 21, 2023

At the current price, that’s almost $2.25 million. But this data is actually skewed, given that the token has lost 27.2% over the past 24 hours, and that the attacker has made many moves since taking control. With a daily high of $7.29 on Saturday, its price plunged to $3.55 after the attack, and is currently trading at $4.62.

When writing these lines, the hacker’s address still hosted 97,700 TORN tokens.

On his side, Binance has temporarily paused the listing of the assetpending more visibility on this case.

If it is usually the smart contracts of the applications themselves that are targeted by hackers, such an event raises awareness that the points of attack on a protocol can be found at different levels of its architecture. On the side of Tornado Cash specifically, the next few days will probably give more leads to judge its survival or not.

👉 Also in the news — Three Arrows Capital: 7 NFTs sold at auction for nearly $2.5 million

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I timidly discovered the world of blockchain at the end of 2018 during my quest for financial freedom. Initially invested moderately, it was only two years later that I took the gamble of betting everything on the movement that was taking shape then. I then dedicate 2021 to training myself better to acquire more knowledge and seriousness. As I often like to say: I still have a billion things to learn. And what I do know, I want to share with you.

Vincent Mayor

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