GitHub updates security incident investigation: An employee's device was compromised, involving a contaminated VS Code extension

GitHub has updated the details of the investigation into the unauthorized access incident of its internal repositories: GitHub detected and contained an incident yesterday involving an employee's device being compromised, which involved a maliciously implanted VS Code extension. GitHub removed the malicious extension, isolated the affected terminals, and immediately initiated an incident response. Current assessments show that only GitHub's internal repositories experienced data exfiltration, and the approximately 3,800 repositories claimed by the attackers are roughly consistent with the investigation results. GitHub has prioritized rotating critical credentials, is analyzing logs, verifying credential rotations, and monitoring subsequent activities, with a complete report to be released after the investigation is concluded.

Additionally, Slow Mist's Chief Information Security Officer 23pds commented on this incident, stating: "By analyzing leaks from cybercrime forums, hackers may have used Anthropic's Mythos security AI to precisely breach GitHub's defenses and steal information from about 4,000 core internal repositories: including the source code for Copilot, the algorithms for CodeQL, the Actions runtime, and the entire billing system. Further analysis of this code could lead to subsequent attacks, having a profound security impact on the integration of the open-source community."