Polyfill supply chain attack hits 100K+ sites
sansec.io
The new Chinese owner of the popular Polyfill JS project injects malware into more than 100 thousand sites.

Archived link

The polyfill.js is a popular open source library to support older browsers. 100K+ sites embed it using the cdn.polyfill.io domain. Notable users are JSTOR, Intuit and World Economic Forum. However, in February this year, a Chinese company bought the domain and the Github account. Since then, this domain was caught injecting malware on mobile devices via any site that embeds cdn.polyfill.io. Any complaints were quickly removed (archive here) from the Github repository.

  • Supermariofan67@programming.devEnglish
    66·
    5 months ago

    This one is already in the default uBlock filters - Badware risks

    I also strongly suggest adding https://big.oisd.nl/ as a filter list. It’s a large and well maintained domain blocklist (sourced from combining lots of other blocklists) that usually adds lots of these sorts of domains quickly and has very few false positives.

    If you want to take it even further, check out the Pro list and Thread Intelligence Feeds list here https://github.com/hagezi/dns-blocklists

    These can all be added to a pihole too if you use one.