Polyfill[.]io Attack Impacts Over 380,000 Hosts, Including Major Companies
Jul 05, 2024
Supply Chain Attack / Malware
The supply chain attack targeting the widely-used Polyfill[.]io JavaScript library is broader in scope than previously thought, with new findings from Censys showing that over 380,000 hosts are embedding a polyfill script linking to the malicious domain as of July 2, 2024. This includes references to "https://cdn.polyfill[.]io" or "https://cdn.polyfill[.]com" in their HTTP responses, the attack surface management firm said. "Approximately 237,700, are located within the Hetzner network (AS24940), primarily in Germany," it noted. "This is not surprising – Hetzner is a popular web hosting service, and many website developers leverage it." Further analysis of the affected hosts has revealed domains tied to prominent companies like WarnerBros, Hulu, Mercedes-Benz, and Pearson that reference the malicious endpoint in question. Details of the attack emerged in late June 2024 when Sansec alerted that code hosted on the Polyfill domain had been m