Wasabi Protocol Suffers $4.5 Million Loss Due to Admin Key Breach

The decentralized finance sector continues to experience significant losses, with Wasabi Protocol being the latest to fall victim to a major exploit. On Thursday, the protocol, which operates as a perpetuals trading platform on Ethereum and Base, was drained of about $4.55 million after its deployer key was compromised, according to a report by security firm Blockaid. This incident marks the latest in a series of breaches that have resulted in over $605 million in losses across at least 12 incidents within the DeFi space over the past month. The attack bears a striking resemblance to the Drift Protocol exploit that occurred on April 1, in which North Korea-linked attackers utilized a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The mechanics of the Wasabi Protocol breach involved an externally owned account, or EOA, known as wasabideployer.eth, which held the sole ADMIN_ROLE within the protocol's permission system. An EOA is essentially a wallet controlled by a private key, as opposed to a smart contract, and whoever holds the key has control over the wallet. Once the attackers gained access to the deployer key, they granted themselves admin privileges without any delay by calling grantRole on the permission contract. Subsequently, their helper contract upgraded Wasabi's perp vaults and Long Pool to malicious implementations that drained the balances, as reported by Blockaid. The exploit leveraged the Universal Upgradeable Proxy Standard (UUPS), a widely used standard that enables a smart contract to modify its underlying code while retaining the same address. Although UUPS allows developers to fix bugs without migrating users, it also poses a significant risk if an attacker gains control of admin permissions, as they can replace the contract's logic with malicious code designed to steal funds. According to Blockaid, Wasabi Protocol lacked a timelock or multisig to protect the admin role, leaving a single key with full control over the protocol. A timelock would have forced a delay between the announcement and execution of an admin action, providing users with time to react, while a multisig would have required multiple signers to approve any changes. The absence of these security measures made the protocol vulnerable to the exploit. Blockaid's exploit detection system identified the ongoing admin-key compromise exploit on Wasabi Protocol across both Ethereum and Base. The compromised contracts include Wasabi's wWETH, sUSDC, wBITCOIN, wPEPE, and Long Pool vaults on Ethereum, as well as its sUSDC, wWETH, sBTC, sVIRTUAL, sAERO, and sBRETT vaults on Base. Users holding Wasabi LP tokens were advised to revoke any active approvals to the vault contracts, as the underlying assets backing those tokens had either been drained or remained at risk. This incident is part of a larger trend of exploits that have plagued the DeFi space over the past month, resulting in cumulative losses exceeding $770 million across more than 30 reported incidents. The majority of these losses occurred in April, with smaller breaches affecting CoW Swap, Grinex, Resolv Labs, and Volo Protocol, among others. A common thread among these incidents is not a new vulnerability but rather the repeated exploitation of known security weaknesses, with each incident producing the same post-mortem language about lessons learned, only to be followed by another exploit before the lessons can be implemented. Wasabi Protocol has yet to issue a public statement regarding the incident.