Vulnerability Details : CVE-2021-41151
Backstage is an open platform for building developer portals. In affected versions A malicious actor could read sensitive files from the environment where Scaffolder Tasks are run. The attack is executed by crafting a custom Scaffolder template with a `github:publish:pull-request` action and a particular source path. When the template is executed the sensitive files would be included in the published pull request. This vulnerability is mitigated by the fact that an attacker would need access to create and register templates in the Backstage catalog, and that the attack is very visible given that the exfiltration happens via a pull request. The vulnerability is patched in the `0.15.9` release of `@backstage/plugin-scaffolder-backend`.
Vulnerability category: Directory traversal
Products affected by CVE-2021-41151
- cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-41151
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 29 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-41151
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | AV:N/AC:L/Au:S/C:P/I:N/A:N |
8.0
|
2.9
|
NIST | |
|
4.9
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
1.2
|
3.6
|
NIST | |
|
6.8
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N |
2.3
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2021-41151
-
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.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
References for CVE-2021-41151
-
https://github.com/backstage/backstage/security/advisories/GHSA-pvv8-8fx9-h673
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in @backstage/plugin-scaffolder-backend · Advisory · backstage/backstage · GitHubThird Party Advisory
-
https://github.com/backstage/backstage/commit/6968962c920508eae19a4c1c200fa2c8980a4006
scaffolder-backend: release path traversal fix · backstage/backstage@6968962 · GitHubPatch;Third Party Advisory
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