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Time-of-check Time-of-use (TOCTOU) Race Condition in chownr

Low severity GitHub Reviewed Published Feb 10, 2022 to the GitHub Advisory Database • Updated Apr 3, 2023

Package

npm chownr (npm)

Affected versions

< 1.1.0

Patched versions

1.1.0

Description

A TOCTOU issue in the chownr package before 1.1.0 for Node.js 10.10 could allow a local attacker to trick it into descending into unintended directories via symlink attacks.

References

Published by the National Vulnerability Database Jun 15, 2020
Reviewed May 12, 2021
Published to the GitHub Advisory Database Feb 10, 2022
Last updated Apr 3, 2023

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS score

0.042%
(5th percentile)

Weaknesses

CVE ID

CVE-2017-18869

GHSA ID

GHSA-c6rq-rjc2-86v2

Source code

No known source code

Credits

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