CVE-2021-43783
Backstage Scaffolder Backend Template Injection
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.
INFO
Published Date :
Nov. 29, 2021, 8:15 p.m.
Last Modified :
Dec. 1, 2021, 7:41 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.7
Exploitability Score :
3.1
Affected Products
The following products are affected by CVE-2021-43783
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-43783.
| URL | 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-43783 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-43783 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Dec. 01, 2021
Action Type Old Value New Value 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 Added CPE Configuration OR *cpe:2.3:a:backstage:backstage:*:*:*:*:*:*:*:* versions up to (excluding) 0.15.14
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-43783 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-43783
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.08 }} 0.00%
score
0.30834
percentile