CVE-2021-43783

Path Traversal in @backstage/plugin-scaffolder-backend

Severity Score

8.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

@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.

backstage/plugin-scaffolder-backend es el backend para las plantillas de software Backstage por defecto. En las versiones afectadas, un actor malicioso con acceso de escritura a una plantilla de scaffolder registrada es capaz de manipular la plantilla de manera que escriba archivos en rutas arbitrarias en la instancia del host de scaffolder-backend. Esta vulnerabilidad también puede ser explotada en alguna situación mediante la entrada del usuario cuando se ejecuta una plantilla, lo que significa que no se necesita acceso de escritura a las plantillas. Sin embargo, este método no permitirá al atacante controlar el contenido del archivo inyectado, a menos que la plantilla también esté diseñada de una forma específica que permita controlar el contenido del archivo. Esta vulnerabilidad ha sido corregida en la versión "0.15.14" del "@backstage/plugin-scaffolder-backend". Este ataque es mitigado restringiendo el acceso y requiriendo revisiones cuando son registradas o modifican las plantillas de scaffolder

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-16 CVE Reserved
2021-11-29 CVE Published
2023-06-22 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CAPEC

References (2)

URL	Tag	Source
https://github.com/backstage/backstage/security/advisories/GHSA-mg3m-f475-28hv	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/backstage/backstage/commit/f9352ab606367cd9efc6ff048915c70ed3013b7f	2021-12-01

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Backstage Search vendor "Backstage"		Backstage Search vendor "Backstage" for product "Backstage"				< 0.15.14 Search vendor "Backstage" for product "Backstage" and version " < 0.15.14"		-		Affected