CVE-2021-43783

Published on: Not Yet Published

Last Modified on: 12/01/2021 07:41:00 PM UTC

CVE-2021-43783 - advisory for GHSA-mg3m-f475-28hv

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L

Certain versions of Backstage from Backstage contain the following vulnerability:

@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.

  • CVE-2021-43783 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo backstage - backstage version < 0.15.14

CVSS3 Score: 8.5 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED NONE HIGH LOW

CVSS2 Score: 5.5 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK LOW SINGLE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE PARTIAL PARTIAL

CVE References

Description Tags Link
scaffolder-backend: removed all usaged and prevent new usage of path.… · backstage/[email protected] · GitHub github.com
text/html
URL Logo MISC github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3013b7f
Path Traversal in @backstage/plugin-scaffolder-backend fetch:template action · Advisory · backstage/backstage · GitHub github.com
text/html
URL Logo CONFIRM github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hv

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationBackstageBackstageAllAllAllAll
  • cpe:2.3:a:backstage:backstage:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-43783 : @backstage/plugin-scaffolder-backend is the backend for the default Backstage software templates.… twitter.com/i/web/status/1… 2021-11-29 19:23:29
Twitter Icon @0_exploit CVE-2021-43783 dlvr.it/SDQql0 2021-11-29 21:33:11
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