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Test ID:1.3.6.1.4.1.25623.1.0.844980
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for grub2-signed (USN-4992-1)
Summary:The remote host is missing an update for the 'grub2-signed'; package(s) announced via the USN-4992-1 advisory.
Description:Summary:
The remote host is missing an update for the 'grub2-signed'
package(s) announced via the USN-4992-1 advisory.

Vulnerability Insight:
Máté Kukri discovered that the acpi command in GRUB 2 allowed privileged
users to load crafted ACPI tables when secure boot is enabled. An attacker
could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-14372)

Chris Coulson discovered that the rmmod command in GRUB 2 contained a use-
after-free vulnerability. A local attacker could use this to execute
arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-25632)

Chris Coulson discovered that a buffer overflow existed in the command line
parser in GRUB 2. A local attacker could use this to execute arbitrary code
and bypass UEFI Secure Boot restrictions. (CVE-2020-27749)

It was discovered that the cutmem command in GRUB 2 did not honor secure
boot locking. A local attacker could use this to execute arbitrary code and
bypass UEFI Secure Boot restrictions. (CVE-2020-27779)

It was discovered that the option parser in GRUB 2 contained a heap
overflow vulnerability. A local attacker could use this to execute
arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20225)

It was discovered that the menu rendering implementation in GRUB 2 did not
properly calculate the amount of memory needed in some situations, leading
to out-of-bounds writes. A local attacker could use this to execute
arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20233)

Affected Software/OS:
'grub2-signed' package(s) on Ubuntu 20.10, Ubuntu 20.04 LTS, Ubuntu 18.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
7.2

CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2020-14372
Common Vulnerability Exposure (CVE) ID: CVE-2020-25632
Common Vulnerability Exposure (CVE) ID: CVE-2020-27749
Common Vulnerability Exposure (CVE) ID: CVE-2020-27779
Common Vulnerability Exposure (CVE) ID: CVE-2021-20225
Common Vulnerability Exposure (CVE) ID: CVE-2021-20233
CopyrightCopyright (C) 2021 Greenbone Networks GmbH

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