High severity · published Mar 3, 2021
CVE-2020-27779
A flaw was found in grub2 in versions prior to 2.06
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
7.0; 8.0 · source: NVD
EL
Enterprise Linux Server Aus · Redhat
7.2; 7.3; 7.4; 7.6; 7.7; 8.2 · source: NVD
EL
Enterprise Linux Server Eus · Redhat
7.6; 7.7; 8.1 · source: NVD
EL
Enterprise Linux Server Tus · Redhat
7.4; 7.6; 7.7; 8.2 · source: NVD
EL
Enterprise Linux Workstation · Redhat
7.0 · source: NVD
FE
Fedora · Fedoraproject
33; 34 · source: NVD
GR
Grub2 · Gnu
before 2.06 · source: NVD
OS
Ontap Select Deploy Administration Utility · Netapp
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27779
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-27779
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1900698
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
Third Party Advisory
https://security.gentoo.org/glsa/202104-05
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0001/
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