Password management software provider LastPass says its investigation into the August 2022 data breach has not revealed any attempts to inject malicious code into LastPass software.
The GoTo-owned company announced on August 25 that unknown intruders had gained access to the LastPass development environment and stole “portions of source code and some proprietary LastPass technical information”.
At the time, the company posted a notice online, saying that no user data or master passwords were compromised in the incident, and that its products and services continued to operate normally throughout the incident.
In a September 15 update, LastPass provided additional information on the incident, explaining that the data breach was limited to the LastPass development environment, which does not store customer data, and which is physically separated from production.
“LastPass does not have any access to the master passwords of our customers’ vaults – without the master password, it is not possible for anyone other than the owner of a vault to decrypt vault data as part of our Zero Knowledge security model,” the company also notes.
LastPass’ investigation into the incident revealed that the attackers compromised a developer’s endpoint and used it to access the company’s development environment over a four-day period.
“While the method used for the initial endpoint compromise is inconclusive, the threat actor utilized their persistent access to impersonate the developer once the developer had successfully authenticated using multi-factor authentication,” LastPass notes.
The company also performed an analysis of its source code and production builds and says it found no “evidence of attempts of code-poisoning or malicious code injection”.
Furthermore, LastPass says that code injections would have been prevented by the fact that developers cannot push code into production, as this operation is performed by a separate team and only after “rigorous code review, testing, and validation processes” have been completed.
LastPass also says it has taken steps to further enhance its source code safety practices and to improve overall security controls, including through the deployment of additional threat intelligence and detection and prevention capabilities.