CVE-2021-21267

Regular Expression Denial-of-Service in npm schema-inspector

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Schema-Inspector is an open-source tool to sanitize and validate JS objects (npm package schema-inspector). In before version 2.0.0, email address validation is vulnerable to a denial-of-service attack where some input (for example `a@0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.`) will freeze the program or web browser page executing the code. This affects any current schema-inspector users using any version to validate email addresses. Users who do not do email validation, and instead do other types of validation (like string min or max length, etc), are not affected. Users should upgrade to version 2.0.0, which uses a regex expression that isn't vulnerable to ReDoS.

Schema-Inspector es una herramienta de código abierto para sanear y comprobar objetos JS (el inspector de esquema del paquete npm). versiones anteriores a 2.0.0, la comprobación de la dirección de correo electrónico es vulnerable a un ataque de denegación de servicio donde alguna entrada (por ejemplo, "a@0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 .0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 ") congelará el programa o la página del navegador web que ejecuta el código. Esto afecta a cualquier usuario actual del inspector de esquemas que usan cualquier versión para comprobar direcciones de correo electrónico. Los usuarios que no realizan la comprobación por correo electrónico y, en su lugar, realizan otros tipos de comprobación (como la longitud mínima o máxima de la cadena, etc.), no están afectados. Los usuarios deben actualizar a la versión 2.0.0, que usa una expresión regular que no es vulnerable a ReDoS

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-03-19 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2024-09-08 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation
CWE-400: Uncontrolled Resource Consumption

CAPEC

References (4)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20210528-0006	Third Party Advisory

URL	Date	SRC
https://gist.github.com/mattwelke/b7f42424680a57b8161794ad1737cd8f	2024-08-03
https://github.com/schema-inspector/schema-inspector/security/advisories/GHSA-f38p-c2gq-4pmr	2024-08-03
https://www.npmjs.com/package/schema-inspector	2024-08-03

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Schema-inspector Project Search vendor "Schema-inspector Project"		Schema-inspector Search vendor "Schema-inspector Project" for product "Schema-inspector"				< 2.0.0 Search vendor "Schema-inspector Project" for product "Schema-inspector" and version " < 2.0.0"		node.js		Affected
Netapp Search vendor "Netapp"		E-series Performance Analyzer Search vendor "Netapp" for product "E-series Performance Analyzer"				-		-		Affected
Netapp Search vendor "Netapp"		Oncommand Insight Search vendor "Netapp" for product "Oncommand Insight"				-		-		Affected