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ubuntucveUbuntu.comUB:CVE-2021-20233
HistoryMar 02, 2021 - 12:00 a.m.

CVE-2021-20233

2021-03-0200:00:00
ubuntu.com
ubuntu.com
26
grub2
vulnerability
memory corruption
data confidentiality
integrity
system availability

CVSS2

7.2

Attack Vector

LOCAL

Attack 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

CVSS3

8.2

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

EPSS

0

Percentile

5.1%

JSON

A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in
the menu rendering code performs a length calculation on the assumption
that expressing a quoted single quote will require 3 characters, while it
actually requires 4 characters which allows an attacker to corrupt memory
by one byte for each quote in the input. The highest threat from this
vulnerability is to data confidentiality and integrity as well as system
availability.

Notes

Author Note
sbeattie grub2-unsigned will contain fixes and supersede grub2, which will contain only BIOS grub bits.

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CVSS2

7.2

Attack Vector

LOCAL

Attack 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

CVSS3

8.2

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

EPSS

0

Percentile

5.1%

JSON
Related for UB:CVE-2021-20233
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