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Unauthorized File Access

Low
andreeleuterio published GHSA-m6cx-g6qm-p2cx Dec 12, 2019

Package

npm npm (npm )

Affected versions

<6.13.3

Patched versions

6.13.3

Description

Versions of the npm CLI prior to 6.13.3 are vulnerable to an Arbitrary File Write. It is possible for packages to create symlinks to files outside of thenode_modules folder through the bin field upon installation. A properly constructed entry in the package.json bin field would allow a package publisher to create a symlink pointing to arbitrary files on a user’s system when the package is installed.

This behavior is possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.

Thank you Daniel Ruf for responsibly reporting the issue!

Further information: npm blog post

Severity

Low

CVE ID

CVE-2019-16775

Weaknesses

No CWEs

Credits