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CVE-2020-27749

Description

A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Risk Information

Base Score
6.7
MODERATE
Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS Score
Exploitation Probability
0.034

Associated Vulnerability

VulnerabilityOS Platform
grub2 security update(DSA-4867-1) grub2_2.02+dfsg1-20+deb10u4_i386.debLinux
grub2 security update(DSA-4867-1) grub2_2.02+dfsg1-20+deb10u4_amd64.debLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-2.02-12.47.1.x86_64.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-debuginfo-2.02-12.47.1.x86_64.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-debugsource-2.02-12.47.1.x86_64.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-i386-pc-2.02-12.47.1.x86_64.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-snapper-plugin-2.02-12.47.1.noarch.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-systemd-sleep-plugin-2.02-12.47.1.noarch.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-x86_64-efi-2.02-12.47.1.x86_64.rpmLinux
SUSE-SU-2021:0681-1(SUSE Linux Enterprise Server 12-SP5 ) grub2-x86_64-xen-2.02-12.47.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-common-2.02-90.el8_3.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-debugsource-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-aa64-modules-2.02-90.el8_3.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-ia32-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-ia32-cdboot-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-ia32-modules-2.02-90.el8_3.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-x64-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-x64-cdboot-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-efi-x64-modules-2.02-90.el8_3.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-pc-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-pc-modules-2.02-90.el8_3.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-ppc64le-modules-2.02-90.el8_3.1.noarch.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-tools-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-tools-efi-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-tools-extra-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0696) grub2 security update grub2-tools-minimal-2.02-90.el8_3.1.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-common-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-aa64-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-ia32-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-ia32-cdboot-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-ia32-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-x64-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-x64-cdboot-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-efi-x64-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-pc-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-pc-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-ppc-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-ppc64-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-ppc64le-modules-2.02-0.87.el7_9.2.noarch.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-tools-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-tools-extra-2.02-0.87.el7_9.2.x86_64.rpmLinux
(RHSA-2021:0699) grub2 security update grub2-tools-minimal-2.02-0.87.el7_9.2.x86_64.rpmLinux
Grub2 update (ELSA-2021-0699) grub2-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-common update (ELSA-2021-0699) grub2-common-2.02-0.87.0.7.el7_9.2.noarch.rpmLinux
Grub2-efi-ia32 update (ELSA-2021-0699) grub2-efi-ia32-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-efi-ia32-cdboot update (ELSA-2021-0699) grub2-efi-ia32-cdboot-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-efi-ia32-modules update (ELSA-2021-0699) grub2-efi-ia32-modules-2.02-0.87.0.7.el7_9.2.noarch.rpmLinux
Grub2-efi-x64 update (ELSA-2021-0699) grub2-efi-x64-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-efi-x64-cdboot update (ELSA-2021-0699) grub2-efi-x64-cdboot-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-efi-x64-modules update (ELSA-2021-0699) grub2-efi-x64-modules-2.02-0.87.0.7.el7_9.2.noarch.rpmLinux
Grub2-pc update (ELSA-2021-0699) grub2-pc-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-pc-modules update (ELSA-2021-0699) grub2-pc-modules-2.02-0.87.0.7.el7_9.2.noarch.rpmLinux
Grub2-tools update (ELSA-2021-0699) grub2-tools-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-tools-extra update (ELSA-2021-0699) grub2-tools-extra-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
Grub2-tools-minimal update (ELSA-2021-0699) grub2-tools-minimal-2.02-0.87.0.7.el7_9.2.x86_64.rpmLinux
(RHSA-2021:1734) shim security update shim-ia32-15.4-2.el8_1.x86_64.rpmLinux
(RHSA-2021:1734) shim security update shim-x64-15.4-2.el8_1.x86_64.rpmLinux
GRand Unified Bootloader (USN-4992-1) grub-efi-amd64-bin_2.04-1ubuntu44.2_amd64.debLinux
GRand Unified Bootloader (USN-4992-1) grub-efi-amd64-bin_2.04-1ubuntu44.1.2_i386.debLinux
GRand Unified Bootloader (USN-4992-1) grub-efi-amd64-bin_2.04-1ubuntu44.1.2_amd64.debLinux
GRand Unified Bootloader (USN-4992-1) grub-efi-amd64-signed_1.167.2+2.04-1ubuntu44.2_amd64.debLinux
GRand Unified Bootloader (USN-4992-1) grub-efi-amd64-signed_1.167~18.04.5+2.04-1ubuntu44.1.2_amd64.debLinux
(RHSA-2021:2566) fwupd security update fwupd-1.5.9-1.el8_4.x86_64.rpmLinux
(RHSA-2021:2566) fwupd security update fwupd-debugsource-1.5.9-1.el8_4.x86_64.rpmLinux
CVE-2020-27749NCM

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234