Versio.io

CVE-2020-27749

Common vulnerabilities & exposures (CVE)

CVE databaseCVE database blogpostRelease & EoL database
 
Published at: - 03-03-2021 06:15
Last modified: - 13-05-2022 10:51
Total changes: - 6

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Low
Attack complexity
Local
Attack vector
High
Availability
High
Confidentiality
High
Integrity
High
Privileges required
Unchanged
Scope
None
User interaction
6.7
Base score
0.8
5.9
Exploitability score
Impact score
 

Verification logic

OR
OR
vendor=gnu AND product=grub2 AND versionEndExcluding=2.06
OR
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_aus AND version=7.2
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_workstation AND version=7.0
vendor=Red Hat Enterprise Linux AND product=enterprise_linux AND version=7.0
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_aus AND version=7.3
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_aus AND version=7.4
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_tus AND version=7.4
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_tus AND version=7.6
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_eus AND version=7.6
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_aus AND version=7.6
vendor=Red Hat Enterprise Linux AND product=enterprise_linux AND version=8.0
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_aus AND version=7.7
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_aus AND version=8.2
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_eus AND version=7.7
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_eus AND version=8.1
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_tus AND version=7.7
vendor=Red Hat Enterprise Linux AND product=enterprise_linux_server_tus AND version=8.2
OR
vendor=fedoraproject AND product=fedora AND version=33
vendor=fedoraproject AND product=fedora AND version=34
OR
vendor=netapp AND product=ontap_select_deploy_administration_utility AND version=-
 

Reference

 


Keywords

NVD

 

CVE-2020-27749

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures

 

We use cookies to ensure that we give you the best experience on our website. Read privacy policies for more information.