Terra-Based Mirror Protocol Suffers $90 Million Unnoticed Exploit
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Terra-Based Mirror Protocol Suffers $90 Million Unnoticed Exploit

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Azeez Mustapha

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Until last week, Mirror Protocol, a DeFi protocol on the old Terra blockchain, suffered a $90 million exploit that went largely unnoticed. According to reports, the exploit occurred on the DeFi project in October 2021.

Mirror Protocol is a DeFi platform that allows users to take trading positions on tech stocks using synthetic assets.

The exploit was unraveled by a prominent Terra community member and analyst nicknamed “FatMan.”

Blockchain security company BlockSec corroborated FatMan’s findings after analyzing the exploit transaction in question.

The Mirror Protocol Exploit Explained

Whenever a user of Mirror Protocol wants to short a tech stock, they are required to lock some amount of collateral, including UST, LUNA Classic (LUNC), and mAssets, for a minimum of two weeks. After the trade and the minimum holding period elapses, the user could unlock the collateral and release funds to their wallet. This entire process was made possible with the help of smart contract-generated ID numbers.

However, due to a bug in the protocol’s code, the lock contract could not register when someone used the same generated ID number to withdraw funds multiple times.

In October 2021, an unknown platform user discovered this bug and realized they could use duplicate IDs to unlock more collateral than they had. This gave perpetrators the ability to withdraw funds without any authorization. After repeated exploits, the amount of collateral stolen ran up to $90 million in seven months.

The Mirror Protocol incident is one of the rare events where an exploit went unnoticed for a prolonged period, despite on-chain data. Blockchain projects are usually quick to report security breaches for transparency purposes.

BlockSec explained that the exploit likely went under the radar for as long as it did because fewer people were scouring the Terra blockchain for issues compared to other blockchains like Ethereum.

The Mirror Protocol team or Terraform Labs have yet to comment on the issue.

 

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