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Security Advisories: GSA_kwCzR0hTQS1tZzNtLWY0NzUtMjhods0YQg

Path Traversal in @backstage/plugin-scaffolder-backend

Impact

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.

Patches

This vulnerability is fixed in version 0.15.14 of the @backstage/plugin-scaffolder-backend.

Workarounds

This attack is mitigated by restricting access and requiring reviews when registering or modifying scaffolder templates.

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-mg3m-f475-28hv
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1tZzNtLWY0NzUtMjhods0YQg
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: almost 3 years ago
Updated: almost 2 years ago


CVSS Score: 8.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L

Identifiers: GHSA-mg3m-f475-28hv, CVE-2021-43783
References: Repository: https://github.com/backstage/backstage
Blast Radius: 22.3

Affected Packages

npm:@backstage/plugin-scaffolder-backend
Dependent packages: 66
Dependent repositories: 424
Downloads: 207,501 last month
Affected Version Ranges: < 0.15.14
Fixed in: 0.15.14
All affected versions: 0.1.1, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.5.2, 0.6.0, 0.7.0, 0.7.1, 0.8.0, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 0.9.6, 0.10.0, 0.10.1, 0.11.0, 0.11.1, 0.11.2, 0.11.3, 0.11.4, 0.11.5, 0.12.0, 0.12.1, 0.12.2, 0.12.3, 0.12.4, 0.13.0, 0.14.0, 0.14.1, 0.14.2, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.15.4, 0.15.5, 0.15.6, 0.15.7, 0.15.8, 0.15.9, 0.15.10, 0.15.11, 0.15.12, 0.15.13
All unaffected versions: 0.15.14, 0.15.15, 0.15.16, 0.15.17, 0.15.18, 0.15.19, 0.15.20, 0.15.21, 0.15.22, 0.15.23, 0.15.24, 0.16.0, 0.16.1, 0.17.0, 0.17.1, 0.17.2, 0.17.3, 0.18.0, 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.5.1, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.10.1, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0, 1.15.0, 1.15.1, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.18.0, 1.18.1, 1.19.0, 1.19.1, 1.19.2, 1.20.0, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.22.5, 1.22.6, 1.22.7, 1.22.8, 1.22.9, 1.22.10, 1.22.11, 1.23.0, 1.24.0, 1.24.1, 1.25.0, 1.26.0, 1.26.1, 1.26.2