Medium severity · published Jul 29, 2020
CVE-2020-15705
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed
6.4
CVSS
1.4%
EPSS
No
On KEV
Description
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
Windows · Microsoft
1607; 1709; 1803; 1809; 1903; 1909; +1 more · source: NVD
DL
Debian Linux · Debian
10.0 · source: NVD
EL
Enterprise Linux · Redhat
7.0; 8.0 · source: NVD
EL
Enterprise Linux Atomic Host · Redhat
All versions, or not specified · source: NVD
GR
Grub2 · Gnu
through 2.04 · source: NVD
LE
Leap · Opensuse
15.1; 15.2 · source: NVD
OC
Openshift Container Platform · Redhat
4.0 · source: NVD
SL
Suse Linux Enterprise Server · Suse
11; 12; 15 · source: NVD
UL
Ubuntu Linux · Canonical
14.04; 16.04; 18.04; 20.04 · source: NVD
W8
Windows 8.1 · Microsoft
All versions, or not specified · source: NVD
WR
Windows RT 8.1 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2012 · Microsoft
r2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15705
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-15705
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html
Third Party Advisory
http://ubuntu.com/security/notices/USN-4432-1
Mailing List
http://www.openwall.com/lists/oss-security/2020/07/29/3
Mailing List
http://www.openwall.com/lists/oss-security/2021/03/02/3
Mailing List
http://www.openwall.com/lists/oss-security/2021/09/17/2
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