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Ubuntu: (Multiple Advisories) (CVE-2020-14310): GRUB2 regression

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Ubuntu: (Multiple Advisories) (CVE-2020-14310): GRUB2 regression

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:N/I:P/A:P)
Published
07/29/2020
Created
08/07/2020
Added
08/05/2020
Modified
06/12/2021

Description

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.

Solution(s)

  • ubuntu-upgrade-
  • ubuntu-upgrade-1-34-20-2-02-beta2-9ubuntu1-21
  • ubuntu-upgrade-1-34-22-2-02-beta2-9ubuntu1-20
  • ubuntu-upgrade-2-02-beta2-9ubuntu1-20
  • ubuntu-upgrade-2-02-beta2-9ubuntu1-21
  • ubuntu-upgrade-available
  • ubuntu-upgrade-desktop
  • ubuntu-upgrade-grub-efi-amd64-bin
  • ubuntu-upgrade-grub-efi-amd64-signed
  • ubuntu-upgrade-grub-efi-arm-bin
  • ubuntu-upgrade-grub-efi-arm64-bin
  • ubuntu-upgrade-grub-efi-arm64-signed
  • ubuntu-upgrade-grub-efi-ia32-bin
  • ubuntu-upgrade-infra
  • ubuntu-upgrade-or
  • ubuntu-upgrade-ua
  • ubuntu-upgrade-with

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