// For flags

CVE-2020-10713

grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process

Severity Score

8.2
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to establish access to the system such as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a networked system with root access. With this access, an attacker could then craft a string to cause a buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Se encontró un fallo en grub2, versiones anteriores a 2.06. Un atacante puede usar el fallo de GRUB 2 para secuestrar y manipular el proceso de verificación de GRUB. Este fallo también permite omitir las protecciones de Secure Boot. A fin de cargar un kernel no confiable o modificado, un atacante primero necesitaría establecer acceso al sistema, tal y como conseguir acceso físico, obtener la capacidad de alterar una red pxe-boot o tener acceso remoto a un sistema de red con acceso root. Con este acceso, un atacante podría diseñar una cadena para causar un desbordamiento del búfer al inyectar una carga útil maliciosa que conlleve a una ejecución de código arbitraria dentro de GRUB. La mayor amenaza de esta vulnerabilidad es la confidencialidad e integridad de los datos, así como la disponibilidad del sistema

A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to establish access to the system such as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a networked system with root access. With this access, an attacker could then craft a string to cause a buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
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
  • 2020-03-20 CVE Reserved
  • 2020-07-28 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Gnu
Search vendor "Gnu"
Grub2
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< 2.06
Search vendor "Gnu" for product "Grub2" and version " < 2.06"
-
Affected
Debian
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Debian Linux
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10.0
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-
Affected
Opensuse
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Leap
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15.1
Search vendor "Opensuse" for product "Leap" and version "15.1"
-
Affected
Opensuse
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Leap
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15.2
Search vendor "Opensuse" for product "Leap" and version "15.2"
-
Affected
Vmware
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Photon Os
Search vendor "Vmware" for product "Photon Os"
< 2.0
Search vendor "Vmware" for product "Photon Os" and version " < 2.0"
-
Affected