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In what’s a new kind of software supply chain attack aimed at open source projects, it has emerged that threat actors could seize control of expired Amazon S3 buckets to serve rogue binaries without altering the modules themselves.

“Malicious binaries steal the user IDs, passwords, local machine environment variables, and local host name, and then exfiltrates the stolen data to the hijacked bucket,” Checkmarx researcher Guy Nachshon said.

The attack was first observed in the case of an npm package called bignum, which, until version 0.13.0, relied on an Amazon S3 bucket to download pre-built binary versions of an addon named node-pre-gyp during installation.

images from Hacker News