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Alma Linux: CVE-2020-27749: Moderate: shim security update (ALSA-2021-1734)

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Alma Linux: CVE-2020-27749: Moderate: shim security update (ALSA-2021-1734)

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
03/03/2021
Created
05/05/2022
Added
05/04/2022
Modified
10/28/2022

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.

Solution(s)

  • alma-upgrade-shim-aa64
  • alma-upgrade-shim-ia32
  • alma-upgrade-shim-unsigned-aarch64
  • alma-upgrade-shim-unsigned-x64
  • alma-upgrade-shim-x64

References

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