GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.
CVE-2020-15707

5.7MEDIUM

Key Information:

Vendor

Ubuntu

Status
Grub2 In Ubuntu
Vendor
CVE Published:
29 July 2020

What is CVE-2020-15707?

Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.

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Affected Version(s)

grub2 in Ubuntu 20.04 LTS < 2.04-1ubuntu26.1

grub2 in Ubuntu 18.04 LTS < 2.02-2ubuntu8.16

grub2 in Ubuntu 16.04 LTS < 2.02~beta2-36ubuntu3.26

References

https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the...
x_refsource_CONFIRM
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2S...
vendor-advisoryx_refsource_UBUNTU
http://ubuntu.com/security/notices/USN-4432-1
vendor-advisoryx_refsource_UBUNTU

CVSS V3.1

Score:
5.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Colin Watson
Chris Coulson
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