LastPass users with weak master passwords may need to change the individual passwords they stored with the service.
Password management service LastPass was hacked in August 2022, and the attacker stole users’ encrypted passwords, according to a Dec. 23 statement from the company. This means that the attacker may be able to crack some website passwords of LastPass users through brute force guessing.
— Thomas Zickell (@thomaszickell) December 23, 2022
LastPass first disclosed the breach in August 2022 but at that time, it appeared that the attacker had only obtained source code and technical information, not any customer data. However, the company has investigated and discovered that the attacker used this technical information to attack another employee’s device, which was then used to obtain keys to customer data stored in a cloud storage system.
As a result, unencrypted customer metadata has been revealed to the attacker, including “company names, end-user names, billing addresses, email addresses, telephone numbers, and the IP addresses from which customers were accessing the LastPass service.”
In addition, some customers’ encrypted vaults were stolen. These vaults contain the website passwords that each user stores with the LastPass service. Luckily, the vaults are encrypted with a Master Password, which should prevent the attacker from being able to read them.
The statement from LastPass emphasizes that the service uses state-of-the-art encryption to make it very difficult for an attacker to read vault files without knowing the Master Password, stating:
“These encrypted fields remain secured with 256-bit AES encryption and can only be decrypted with a unique encryption key derived from each user’s master password using our Zero Knowledge architecture. As a reminder, the master password is never known to LastPass and is not stored or maintained by LastPass.”
Even so, LastPass admits that if a customer has used a weak Master Password, the attacker may be able to use brute force to guess this password, allowing them to decrypt the vault and gain all of the customers’ website passwords, as LastPass explains:
“it is important to note that if your master password does not make use of the [best practices the company recommends], then it would significantly reduce the number of attempts needed to guess it correctly. In this case, as an extra security measure, you should consider minimizing risk by changing passwords of websites you have stored.”
Can password manager hacks be eliminated with Web3?
The LastPass exploit illustrates a claim that Web3 developers have been making for years: that the traditional username and password login system needs to be scrapped in favor of blockchain wallet logins.
According to advocates for crypto wallet login, traditional password logins are fundamentally insecure because they require hashes of passwords to be kept on cloud servers. If these hashes are stolen, they can be cracked. In addition, if a user relies on the same password for multiple websites, one stolen password can lead to a breach of all others. On the other hand, most users can’t remember multiple passwords for different websites.
To solve this problem, password management services like LastPass have been invented. But these also rely on cloud services to store encrypted password vaults. If an attacker manages to obtain the password vault from the password manager service, they may be able to crack the vault and obtain all of the user’s passwords.
Web3 applications solve the problem in a different way. They use browser extension wallets like Metamask or Trustwallet to sign in using a cryptographic signature, eliminating the need for a password to be stored in the cloud.
But so far, this method has only been standardized for decentralized applications. Traditional apps that require a central server don’t currently have an agreed-upon standard for how to use crypto wallets for logins.
However, a recent Ethereum Improvement Proposal (EIP) aims to remedy this situation. Called “EIP-4361,” the proposal attempts to provide a universal standard for web logins that works for both centralized and decentralized applications.
If this standard is agreed upon and implemented by the Web3 industry, its proponents hope that the entire world wide web will eventually get rid of password logins altogether, eliminating the risk of password manager breaches like the one that has happened at LastPass.