// For flags

CVE-2021-21425

Unauthenticated Arbitrary YAML Write/Update leads to Code Execution

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

3
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Grav Admin Plugin is an HTML user interface that provides a way to configure Grav and create and modify pages. In versions 1.10.7 and earlier, an unauthenticated user can execute some methods of administrator controller without needing any credentials. Particular method execution will result in arbitrary YAML file creation or content change of existing YAML files on the system. Successfully exploitation of that vulnerability results in configuration changes, such as general site information change, custom scheduler job definition, etc. Due to the nature of the vulnerability, an adversary can change some part of the webpage, or hijack an administrator account, or execute operating system command under the context of the web-server user. This vulnerability is fixed in version 1.10.8. Blocking access to the `/admin` path from untrusted sources can be applied as a workaround.

Grav Admin Plugin es una interfaz de usuario HTML que proporciona una manera de configurar Grav y crear y modificar páginas. En versiones 1.10.7 y anteriores, un usuario no autenticado puede ejecutar algunos métodos de controlador de administrador sin necesidad de credenciales. Una ejecución de un método particular dará como resultado la creación arbitraria de archivos YAML o el cambio de contenido de archivos YAML existentes en el sistema. Una explotación con éxito de esa vulnerabilidad resulta en cambios de configuración, como cambios en la información general del sitio, definición del trabajo del programador personalizado, etc. Debido a la naturaleza de la vulnerabilidad, un adversario puede cambiar alguna parte de la página web, o secuestrar una cuenta de administrador, o ejecutar un comando del sistema operativo en el contexto del usuario del servidor web. Esta vulnerabilidad es corregida en versión 1.10.8. Como solución se puede bloquear el acceso a la ruta "/admin" desde fuentes no confiables

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-04-07 CVE Published
  • 2021-04-21 First Exploit
  • 2024-08-03 CVE Updated
  • 2024-11-02 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-284: Improper Access Control
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Getgrav
Search vendor "Getgrav"
 Grav-plugin-admin
Search vendor "Getgrav" for product "Grav-plugin-admin"
 < 1.10.8
Search vendor "Getgrav" for product "Grav-plugin-admin" and version " < 1.10.8"
-
Affected