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Cross site scripting Vulnerability in backstage Software Catalog

Moderate severity GitHub Reviewed Published Feb 14, 2023 in backstage/backstage • Updated Feb 14, 2023

Package

npm @backstage/catalog-model (npm)

Affected versions

< 1.2.0

Patched versions

1.2.0
npm @backstage/core-components (npm)
< 0.12.4
0.12.4
npm @backstage/plugin-catalog-backend (npm)
< 1.7.2
1.7.2

Description

Impact

This vulnerability allows a malicious actor with access to add or modify content in an instance of the Backstage software catalog to inject script URLs in the entities stored in the catalog. If users of the catalog then click on said URLs, that can lead to an XSS attack.

Patches

This vulnerability has been patched in both the frontend and backend implementations. The default Link component from @backstage/core-components will now reject javascript: URLs, and there is a global override of window.open to do the same.

In addition the catalog model as well as the catalog backend now has additional validation built in that prevents javascript: URLs in known annotations.

Workarounds

The general practice of limiting access to modifying catalog content and requiring code reviews greatly helps mitigate this vulnerability.

For more information

If you have any questions or comments about this advisory:

References

@Rugvip Rugvip published to backstage/backstage Feb 14, 2023
Published by the National Vulnerability Database Feb 14, 2023
Published to the GitHub Advisory Database Feb 14, 2023
Reviewed Feb 14, 2023
Last updated Feb 14, 2023

Severity

Moderate

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
Low
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
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:L/UI:R/S:C/C:H/I:N/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.
(26th percentile)

Weaknesses

CVE ID

CVE-2023-25571

GHSA ID

GHSA-7hv8-3fr9-j2hv

Source code

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