Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Local
0

CVE-2020-27749

Disclosure Date: March 03, 2021 •
CVE-2020-27749 CVSS v3 Base Score: 6.7
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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.

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CVSS V3 Severity and Metrics
Base Score:
6.7 Medium
Impact Score:
5.9
Exploitability Score:
0.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
grub2 grub 2.06
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • fedoraproject,
  • gnu,
  • netapp,
  • redhat

Products

  • enterprise linux 7.0,
  • enterprise linux 8.0,
  • enterprise linux server aus 7.2,
  • enterprise linux server aus 7.3,
  • enterprise linux server aus 7.4,
  • enterprise linux server aus 7.6,
  • enterprise linux server aus 7.7,
  • enterprise linux server aus 8.2,
  • enterprise linux server eus 7.6,
  • enterprise linux server eus 7.7,
  • enterprise linux server eus 8.1,
  • enterprise linux server tus 7.4,
  • enterprise linux server tus 7.6,
  • enterprise linux server tus 7.7,
  • enterprise linux server tus 8.2,
  • enterprise linux workstation 7.0,
  • fedora 33,
  • fedora 34,
  • grub2,
  • ontap select deploy administration utility -
Technical Analysis