Arbitrary File Write Affecting @npmcli/arborist package, versions <2.8.2


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.09% (42nd percentile)

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  • Snyk IDSNYK-JS-NPMCLIARBORIST-1579165
  • published1 Sept 2021
  • disclosed1 Sept 2021
  • creditginkoid, chen-robert

Introduced: 1 Sep 2021

CVE-2021-39134  (opens in a new tab)
CWE-61  (opens in a new tab)

How to fix?

Upgrade @npmcli/arborist to version 2.8.2 or higher.

Overview

@npmcli/arborist is a Manage node_modules trees

Affected versions of this package are vulnerable to Arbitrary File Write. @npmcli/arborist aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder.

This is, in part, accomplished by resolving dependency specifiers defined in package.json manifests for dependencies with a specific name, and nesting folders to resolve conflicting dependencies.

When multiple dependencies differ only in the case of their name, Arborist's internal data structure sees them as separate items that could coexist within the same level in the node_modules hierarchy. However, on case-insensitive file systems (such as macOS and Windows), this is not the case. Combined with a symlink dependency such as file:/some/path, this allows an attacker to create a situation in which arbitrary contents could be written to any location on the filesystem.

References

CVSS Scores

version 3.1