Description

Backstage is an open platform for building developer portals. `@backstage/catalog-model` prior to version 1.2.0, `@backstage/core-components` prior to 0.12.4, and `@backstage/plugin-catalog-backend` prior to 1.7.2 are affected by a cross-site scripting vulnerability. 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. This vulnerability has been patched in both the frontend and backend implementations. The default `Link` component from `@backstage/core-components` version 1.2.0 and greater will now reject `javascript:` URLs, and there is a global override of `window.open` to do the same. In addition, the catalog model v0.12.4 and greater as well as the catalog backend v1.7.2 and greater now has additional validation built in that prevents `javascript:` URLs in known annotations. As a workaround, the general practice of limiting access to modifying catalog content and requiring code reviews greatly help mitigate this vulnerability.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

NIST: NVD

Base Score:  5.4 MEDIUM

Vector:  CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CNA:  GitHub, Inc.

Base Score:  6.8 MEDIUM

Vector:  CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score: N/A

NVD score not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/backstage/backstage/commit/3d1371954512f7fa8bd0e2d357e00eada2c3e8a8	Patch
https://github.com/backstage/backstage/security/advisories/GHSA-7hv8-3fr9-j2hv	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	NIST   GitHub, Inc.
CWE-84	Improper Neutralization of Encoded URI Schemes in a Web Page	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Initial Analysis by NIST 2/23/2023 1:39:30 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:linuxfoundation:backstage_catalog-model:*:*:*:*:*:node.js:*:* versions up to (excluding) 1.2.0 *cpe:2.3:a:linuxfoundation:backstage_core-components:*:*:*:*:*:node.js:*:* versions up to (excluding) 0.12.4 *cpe:2.3:a:linuxfoundation:backstage_plugin-catalog-backend:*:*:*:*:*:node.js:*:* versions up to (excluding) 1.7.2
Added	CVSS V3.1		NIST AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Added	CWE		NIST CWE-79
Changed	Reference Type	https://github.com/backstage/backstage/commit/3d1371954512f7fa8bd0e2d357e00eada2c3e8a8 No Types Assigned	https://github.com/backstage/backstage/commit/3d1371954512f7fa8bd0e2d357e00eada2c3e8a8 Patch
Changed	Reference Type	https://github.com/backstage/backstage/security/advisories/GHSA-7hv8-3fr9-j2hv No Types Assigned	https://github.com/backstage/backstage/security/advisories/GHSA-7hv8-3fr9-j2hv Vendor Advisory