CVE-2021-43783 — HIGH (8.5)

Q: How severe is CVE-2021-43783?

CVE-2021-43783 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2021-43783?

Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Backstage.

Vulnerability 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.

CVSS Score

8.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

LOW

Affected Products

Vendor	Product	Versions
Linuxfoundation	Backstage	< 0.15.14

Related Weaknesses (CWE)

CWE-22

References

https://github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3PatchThird Party Advisory
https://github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hvThird Party Advisory
https://github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3PatchThird Party Advisory
https://github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hvThird Party Advisory

FAQ

What is CVE-2021-43783?

CVE-2021-43783 is a vulnerability with a CVSS score of 8.5 (HIGH). @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 t...

How severe is CVE-2021-43783?

CVE-2021-43783 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-43783?

Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Backstage.