Attackers are exploiting a major weakness that has allowed them access to the NPM code repository with more than 100 credential-stealing packages since August, mostly without detection.
The finding, laid out Wednesday by security firm Koi, brings attention to an NPM practice that allows installed packages to automatically pull down and run unvetted packages from untrusted domains. Koi said a campaign it tracks as PhantomRaven has exploited NPM’s use of “Remote Dynamic Dependences” to flood NPM with 126 malicious packages that have been downloaded more than 86,000 times. Some 80 of those packages remained available as of Wednesday morning, Koi said.
A blind spot
“PhantomRaven demonstrates how sophisticated attackers are getting [better] at exploiting blind spots in traditional security tooling,” Koi’s Oren Yomtov wrote. “Remote Dynamic Dependencies aren’t visible to static analysis.”
