LastPass Admits to Extreme Knowledge Breach, Encrypted Password Vaults Compromised

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Dec 23, 2022Ravie LakshmananPassword Administration / Knowledge Breach

The August 2022 security breach of LastPass could have been extra extreme than beforehand disclosed by the corporate.

The favored password administration service on Thursday revealed that malicious actors obtained a trove of non-public data belonging to its clients that embrace their encrypted password vaults utilizing information siphoned from the break-in.

Additionally stolen is “primary buyer account data and associated metadata together with firm names, end-user names, billing addresses, electronic mail addresses, phone numbers, and the IP addresses from which clients had been accessing the LastPass service,” the corporate said.

The August 2022 incident, which remains a topic of an ongoing investigation, concerned the miscreants accessing supply code and proprietary technical data from its improvement atmosphere through a single compromised worker account.


LastPass mentioned this permitted the unidentified attacker to acquire credentials and keys that had been subsequently leveraged to extract data from a backup saved in a cloud-based storage service, which it emphasised is bodily separate from its manufacturing atmosphere.

On high of that, the adversary is alleged to have copied buyer vault information from the encrypted storage service. It is saved in a “proprietary binary format” that accommodates each unencrypted information, corresponding to web site URLs, and fully-encrypted fields like web site usernames and passwords, safe notes, and form-filled information.

These fields, the corporate defined, are protected utilizing 256-bit AES encryption and could be decoded solely with a key derived from the consumer’s master password on the customers’ units.

LastPass confirmed that the safety lapse didn’t contain entry to unencrypted bank card information, as this data was not archived within the cloud storage container.

The corporate didn’t reveal how latest the backup was, however warned that the menace actor “could try to make use of brute-force to guess your grasp password and decrypt the copies of vault information they took,” in addition to goal clients with social engineering and credential stuffing assaults.

It bears noting at this stage that the success of the brute-force assaults to foretell the grasp passwords is inversely proportional to their energy, which means the better it’s to guess the password, the lesser the variety of makes an attempt required to crack it.

“Should you reuse your grasp password and that password was ever compromised, a menace actor could use dumps of compromised credentials which can be already accessible on the web to aim to entry your account,” LastPass cautioned.

The truth that web site URLs are in plaintext implies that a profitable decryption of the grasp password might give the attackers a way of the web sites a specific consumer holds accounts with, enabling them to mount further phishing or credential theft assaults.

The corporate additional mentioned that it notified a small subset of its enterprise clients – which quantities to lower than 3% – to take sure unspecified motion based mostly on their account configurations.

The event comes days after Okta acknowledged that menace actors gained unauthorized entry to its Workforce Identification Cloud (WIC) repositories hosted on GitHub and copied the supply code.

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