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News/DeFi Breach: $484k Hack Exposes Ledger Flaw

DeFi Breach: $484k Hack Exposes Ledger Flaw

Van Thanh Le

Dec 15 2023

6 months ago3 minutes read
Cute chibi cubic-styled humanoid robot with green and red mosaic design worrying about the Ledger hack

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Ledger's Connect Kit Compromised: DeFi Users Exposed in Crypto Heist

On December 14th, 2023, hackers exploited a vulnerability in Ledger's Connect Kit, a tool used by DeFi protocols to connect to crypto hardware wallets. The attack, lasting roughly five hours with a critical two-hour window, involved a modified version of WalletConnect software containing a malicious payload. This payload hijacked the front ends of several DeFi applications, enabling hackers to steal $484,000.

The vulnerability stemmed from Ledger's automatic update system, which downloaded and installed the compromised version of Connect Kit. This update, hosted on a content delivery network (CDN), targeted Ledger's Node Package Manager (NPM), a crucial interface for interacting with DeFi and NFTs. The attack affected users across various blockchains who utilized LedgerConnect, regardless of the specific DeFi protocol they were using.

Major protocols like SushiLido, Metamask, and Zapper were impacted, prompting users to avoid decentralized applications (dApps) until updated versions were available. The exploit originated from a phishing attack on a former Ledger employee, allowing unauthorized upload of the malicious file to the NPMJS repository.

Ledger and WalletConnect responded swiftly, identifying and removing the compromised version within 40 minutes. However, the nature of the attack, targeting the front-end of websites, exposed a broader vulnerability than just hot wallets. MetaMask released a fix two hours after the attack, highlighting the ongoing risk for DeFi applications.

As of now, protocols using Connect Kit require manual updates to fully mitigate the risk. This incident underscores the importance of robust security measures and vigilance within the DeFi ecosystem, particularly regarding software updates and potential phishing attempts.

A Patchwork of Responses in the Aftermath of Ledger-Linked Exploit

Following a security breach targeting users who connected their Ledger hardware wallets to certain decentralized applications (dApps), a flurry of responses emerged from various actors within the crypto ecosystem.

Ledger, the hardware wallet manufacturer, assured users that their devices and platform, Ledger Live, were not compromised. However, they emphasized the importance of double-checking transaction details before approving them on the interface.

Blockchain investigator ZachXBT traced the exploiter's activity, revealing connections to known phishing scams. DeBank reported that the compromised address accumulated nearly $480,000 in various assets before initiating transfers.
Source: DeBank

In the immediate aftermath, Sushi DeFi, one of the affected dApps, faced warnings from Ledger's CTO Matthew Lilley against further usage. Tether, a stablecoin issuer, swiftly froze an address associated with the exploit, containing roughly $483,000 in assets, including $44,000 of their own USDT.

Further investigation by ZachXBT unearthed transactions between the compromised wallet and the AngelDrainer phishing group, including a transfer of over 4.3 ETH. Tether's action, however, restricts sending USDT from the frozen address while allowing other transactions.

Digital artwork of diverse users gathered around a large, green holographic display of Ledger Connect Kit.webp

Ledger responded promptly, issuing a patch for their software and reiterating the security of their core offerings. Kyber and RevokeCash, two other dApps potentially exposed, temporarily shut down their front-ends as a precautionary measure.

Finally, Ledger confirmed ongoing engagement with authorities to assist in the investigation and recover stolen assets. The incident highlights the importance of vigilance and cautious interaction with dApps, even when using supposedly secure hardware wallets.

Ledger Patches Hack with New Update, Cautions Users on Activation

Following a security breach, Ledger swiftly rolled out software update 1.1.8, urging users to upgrade to bolster their defenses. However, a cautious approach is advised – Ledger recommends a 24-hour waiting period before resuming activity.

The vulnerability stemmed from compromised versions of LedgerHQ's ConnectKit (1.1.5-1.1.7), highlighting the importance of staying up-to-date. To prevent similar incidents, Ledger has implemented a multi-party review system for ConnectKit code deployments, ensuring no single individual controls the process. Additionally, departing employees' system access is automatically revoked, further tightening security measures.

While the patch addresses the immediate threat, Ledger's cautious guidance underscores the importance of vigilance in the ever-evolving digital security landscape. Users are encouraged to prioritize timely updates and maintain awareness of potential risks.

Tightening the Vault: Ledger Reacts to Security Breach

Ledger, the hardware wallet giant, is facing scrutiny following a recent security breach that exposed private keys for some of its customers. In the wake of the incident, CEO Pascal Gauthier has emphasized the company's existing security measures, which include multi-signature code deployment, stringent access controls, and employee offboarding procedures. He has labelled the breach an "isolated case," but acknowledged the need for constant vigilance and improvement.
Source: Ledger website

Looking ahead, Ledger has outlined several steps to bolster its security posture. These include implementing more robust controls, enhancing communication with software distribution channels like NPM, and increasing transparency in transaction signing to empower users with informed decision-making.

However, the incident has also cast a shadow on the broader DeFi ecosystem, raising concerns about the security and integrity of protocols like SushiSwap and other associated dApps. Ledger's past vulnerabilities, including a 2020 customer data leak and a recent software update with misrepresented security features, further fuel these anxieties.

As Ledger works to rebuild trust and refine its security practices, the DeFi community remains on edge, eager to see concrete steps toward safeguarding sensitive user data and assets.


Ledger's compromised Connect Kit exposed DeFi users to a $484,000 heist, highlighting vulnerabilities in front-end website security and automatic software updates. While patched, the incident underscores the need for robust DeFi security, vigilance against phishing attacks, and user awareness of potential risks, even with hardware wallets. Ledger faces rebuilding trust and improving its practices as the DeFi community awaits concrete steps to safeguard user data and assets.


1. How did the Ledger Connect Kit compromise DeFi users?

A phishing attack on a former employee allowed hackers to inject malicious code into the Connect Kit update, hijacking dApp front-ends and stealing funds. Users across various blockchains were impacted, regardless of the specific dApp they used.

2. Were Ledger hardware wallets themselves compromised?

No, Ledger devices and the Ledger Live platform remained secure. The vulnerability resided in the Connect Kit software, which interacts with dApps, not the core hardware wallets.

3. Which DeFi protocols were affected?

Major protocols like SushiSwap, Lido, Metamask, and Zapper were impacted, prompting temporary shutdowns or warnings against usage until updated versions were available.

4. What can I do to protect myself from similar attacks?

  • Double-check transaction details before approving them on any dApp.
  • Manually update your Connect Kit software to version 1.1.8 or later.
  • Be cautious of phishing attempts and unsolicited software updates.
  • Consider diversifying your assets across different platforms and wallets.

5. Is the DeFi ecosystem as a whole secure?

While the Ledger incident exposed vulnerabilities, the DeFi space is constantly evolving to improve security. However, it's crucial to remain vigilant, research protocols thoroughly, and prioritize secure practices like multi-signature transactions and hardware wallet usage.

This article has been refined and enhanced by ChatGPT.

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