CVEvulnerability

CVE-2020-27749

6.7 MEDIUM Published 2021-03-03 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-03-03
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.7 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
7.2 HIGH — AV:L/AC:L/Au:N/C:C/I:C/A:C
Weaknesses
CWE-121, CWE-787

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.

Affected configurations

• gnu grub2 (< 2.06) • redhat enterprise linux 7.0 • redhat enterprise linux 8.0 • redhat enterprise linux server aus 7.2 • redhat enterprise linux server aus 7.3 • redhat enterprise linux server aus 7.4 • redhat enterprise linux server aus 7.6 • redhat enterprise linux server aus 7.7 • redhat enterprise linux server aus 8.2 • redhat enterprise linux server eus 7.6 • redhat enterprise linux server eus 7.7 • redhat enterprise linux server eus 8.1 • redhat enterprise linux server tus 7.4 • redhat enterprise linux server tus 7.6 • redhat enterprise linux server tus 7.7 • redhat enterprise linux server tus 8.2 • redhat enterprise linux workstation 7.0 • fedoraproject fedora 33 • fedoraproject fedora 34 • netapp ontap select deploy administration utility

Related

Weakness · CWE (2)

  • CWE-121 Stack-based Buffer Overflow weakness
  • CWE-787 Out-of-bounds Write weakness

References