Ubuntu.comUB:CVE-2020-25632CVE-2020-25632
8.2 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.0004 Low
EPSS
Percentile
5.3%
A flaw was found in grub2 in versions prior to 2.06. The rmmod
implementation allows the unloading of a module used as a dependency
without checking if any other dependent module is still loaded leading to a
use-after-free scenario. This could allow arbitrary code to be executed or
a bypass of Secure Boot protections. The highest threat from this
vulnerability is to data confidentiality and integrity as well as system
availability.
Notes
| Author | Note |
|---|---|
| alexmurray | CVE title: “grub2: use-after-free in rmmod command” |
| sbeattie | grub2-unsigned will contain fixes and supersede grub2, which will contain only BIOS grub bits. |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | grub2-signed | < 1.167~18.04.5 | UNKNOWN |
| ubuntu | 20.04 | noarch | grub2-signed | < 1.167.2 | UNKNOWN |
| ubuntu | 20.10 | noarch | grub2-signed | < 1.167.2 | UNKNOWN |
| ubuntu | 21.04 | noarch | grub2-signed | < 1.164 | UNKNOWN |
| ubuntu | 21.10 | noarch | grub2-signed | < 1.169 | UNKNOWN |
| ubuntu | 14.04 | noarch | grub2-signed | < any | UNKNOWN |
| ubuntu | 16.04 | noarch | grub2-signed | < 1.164 | UNKNOWN |
| ubuntu | 18.04 | noarch | grub2-unsigned | < 2.04-1ubuntu44.1.2 | UNKNOWN |
| ubuntu | 20.04 | noarch | grub2-unsigned | < 2.04-1ubuntu44.2 | UNKNOWN |
| ubuntu | 20.10 | noarch | grub2-unsigned | < 2.04-1ubuntu44.2 | UNKNOWN |
Related
8.2 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.0004 Low
EPSS
Percentile
5.3%