Versions of the npm CLI prior to 6.13.3 are vulnerable to an Arbitrary File Write. It fails to prevent access to folders outside of the intended node_modules folder through the bin field. A properly constructed entry in the package.json bin field would allow a package publisher to modify and/or gain access to arbitrary files on a user’s system when the package is installed.
This behavior is still possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.
Thank you Daniel Ruf for reporting the issue!
Further information: npm blog post
Versions of the npm CLI prior to 6.13.3 are vulnerable to an Arbitrary File Write. It fails to prevent access to folders outside of the intended
node_modulesfolder through thebinfield. A properly constructed entry in the package.jsonbinfield would allow a package publisher to modify and/or gain access to arbitrary files on a user’s system when the package is installed.This behavior is still possible through install scripts. This vulnerability bypasses a user using the
--ignore-scriptsinstall option.Thank you Daniel Ruf for reporting the issue!
Further information: npm blog post