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`@backstage/backend-common` vulnerable to path traversal through symlinks

High severity GitHub Reviewed Published Feb 23, 2024 in backstage/backstage • Updated Feb 23, 2024

Package

npm @backstage/backend-common (npm)

Affected versions

= 0.21.0
< 0.19.10
>= 0.20.0, < 0.20.2

Patched versions

0.21.1
0.19.10
0.20.2

Description

Impact

Paths checks with the resolveSafeChildPath utility were not exhaustive enough, leading to risk of path traversal vulnerabilities if symlinks can be injected by attackers.

Patches

Patched in @backstage/backend-common version 0.21.1.
Patched in @backstage/backend-common version 0.20.2.
Patched in @backstage/backend-common version 0.19.10.

For more information

If you have any questions or comments about this advisory:

References

@benjdlambert benjdlambert published to backstage/backstage Feb 23, 2024
Published by the National Vulnerability Database Feb 23, 2024
Published to the GitHub Advisory Database Feb 23, 2024
Reviewed Feb 23, 2024
Last updated Feb 23, 2024

Severity

High

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
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
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:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(59th percentile)

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Learn more on MITRE.

CVE ID

CVE-2024-26150

GHSA ID

GHSA-2fc9-xpp8-2g9h

Source code

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