// For flags

CVE-2020-25647

grub2: Out-of-bounds write in grub_usb_device_initialize()

Severity Score

7.6
*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 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Se encontró un fallo en grub2 en versiones anteriores a 2.06. Durante la inicialización del dispositivo USB, los descriptores se leen con muy poca comprobación de límites y se supone que el dispositivo USB proporciona valores saneados. Si es explotada apropiadamente, un atacante podría desencadenar una corrupción en memoria que conlleva a una ejecución de código arbitraria, permitiendo omitir el mecanismo de Secure Boot. 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. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

*Credits: N/A
CVSS Scores
Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-09-16 CVE Reserved
  • 2021-03-03 CVE Published
  • 2024-02-07 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Gnu
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Grub2
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< 2.06
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-
Affected
Redhat
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Enterprise Linux
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7.0
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-
Affected
Redhat
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Enterprise Linux
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8.0
Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"
-
Affected
Redhat
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Enterprise Linux Server Aus
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7.2
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-
Affected
Redhat
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Enterprise Linux Server Aus
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7.3
Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.3"
-
Affected
Redhat
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Enterprise Linux Server Aus
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7.4
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-
Affected
Redhat
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Enterprise Linux Server Aus
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7.6
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-
Affected
Redhat
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Enterprise Linux Server Aus
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7.7
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-
Affected
Redhat
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Enterprise Linux Server Aus
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8.2
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-
Affected
Redhat
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Enterprise Linux Server Eus
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7.6
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-
Affected
Redhat
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Enterprise Linux Server Eus
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7.7
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-
Affected
Redhat
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Enterprise Linux Server Eus
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8.1
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-
Affected
Redhat
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Enterprise Linux Server Tus
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7.4
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-
Affected
Redhat
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Enterprise Linux Server Tus
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7.6
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Affected
Redhat
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Enterprise Linux Server Tus
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7.7
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-
Affected
Redhat
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Enterprise Linux Server Tus
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8.2
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-
Affected
Redhat
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Enterprise Linux Workstation
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7.0
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-
Affected
Fedoraproject
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Fedora
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33
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-
Affected
Fedoraproject
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Fedora
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34
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-
Affected
Netapp
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Ontap Select Deploy Administration Utility
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--
Affected