Description

@backstage/plugin-scaffolder-backend is the backend for the default Backstage software templates. In affected versions a malicious actor with write access to a registered scaffolder template is able to manipulate the template in a way that writes files to arbitrary paths on the scaffolder-backend host instance. This vulnerability can in some situation also be exploited through user input when executing a template, meaning you do not need write access to the templates. This method will not allow the attacker to control the contents of the injected file however, unless the template is also crafted in a specific way that gives control of the file contents. This vulnerability is fixed in version `0.15.14` of the `@backstage/plugin-scaffolder-backend`. This attack is mitigated by restricting access and requiring reviews when registering or modifying scaffolder templates.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  GitHub, Inc.

Base Score:  8.5 HIGH

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

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: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  5.5 MEDIUM

Vector:  (AV:N/AC:L/Au:S/C:N/I:P/A:P)

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 published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3013b7f	Patch  Third Party Advisory
https://github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hv	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')	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 12/01/2021 2:41:55 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:backstage:backstage:*:*:*:*:*:*:*:* versions up to (excluding) 0.15.14
Added	CVSS V2		NIST (AV:N/AC:L/Au:S/C:N/I:P/A:P)
Added	CVSS V3.1		NIST AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
Changed	Reference Type	https://github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3013b7f No Types Assigned	https://github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3013b7f Patch, Third Party Advisory
Changed	Reference Type	https://github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hv No Types Assigned	https://github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hv Third Party Advisory