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Vulnerability Details : CVE-2020-15705

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.
Publish Date : 2020-07-29 Last Update Date : 2021-05-01
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- CVSS Scores & Vulnerability Types

CVSS Score
4.4
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID 347

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2020:3216: grub2 security update (Moderate) oval:com.redhat.rhsa:def:20203216 unix
RHSA-2020:3217: grub2 security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20203217 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2020-15705

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 14.04 * * * Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 16.04 * * * Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 18.04 * * * Version Details Vulnerabilities
4 OS Canonical Ubuntu Linux 20.04 * * * Version Details Vulnerabilities
5 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
6 Application GNU Grub2 * * * * Version Details Vulnerabilities
7 OS Microsoft Windows 10 - * * * Version Details Vulnerabilities
8 OS Microsoft Windows 10 1607 * * * Version Details Vulnerabilities
9 OS Microsoft Windows 10 1709 * * * Version Details Vulnerabilities
10 OS Microsoft Windows 10 1803 * * * Version Details Vulnerabilities
11 OS Microsoft Windows 10 1809 * * * Version Details Vulnerabilities
12 OS Microsoft Windows 10 1903 * * * Version Details Vulnerabilities
13 OS Microsoft Windows 10 1909 * * * Version Details Vulnerabilities
14 OS Microsoft Windows 10 2004 * * * Version Details Vulnerabilities
15 OS Microsoft Windows 8.1 - * * * Version Details Vulnerabilities
16 OS Microsoft Windows Rt 8.1 - * * * Version Details Vulnerabilities
17 OS Microsoft Windows Server 2012 - * * * Version Details Vulnerabilities
18 OS Microsoft Windows Server 2012 R2 * * * Version Details Vulnerabilities
19 OS Microsoft Windows Server 2016 - * * * Version Details Vulnerabilities
20 OS Microsoft Windows Server 2016 1903 * * * Version Details Vulnerabilities
21 OS Microsoft Windows Server 2016 1909 * * * Version Details Vulnerabilities
22 OS Microsoft Windows Server 2016 2004 * * * Version Details Vulnerabilities
23 OS Microsoft Windows Server 2019 - * * * Version Details Vulnerabilities
24 OS Opensuse Leap 15.1 * * * Version Details Vulnerabilities
25 OS Opensuse Leap 15.2 * * * Version Details Vulnerabilities
26 OS Redhat Enterprise Linux 7.0 * * * Version Details Vulnerabilities
27 OS Redhat Enterprise Linux 8.0 * * * Version Details Vulnerabilities
28 Application Redhat Enterprise Linux Atomic Host - * * * Version Details Vulnerabilities
29 Application Redhat Openshift Container Platform 4.0 * * * Version Details Vulnerabilities
30 OS Suse Suse Linux Enterprise Server 11 * * * Version Details Vulnerabilities
31 OS Suse Suse Linux Enterprise Server 12 * * * Version Details Vulnerabilities
32 OS Suse Suse Linux Enterprise Server 15 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 4
Debian Debian Linux 1
GNU Grub2 1
Microsoft Windows 10 8
Microsoft Windows 8.1 1
Microsoft Windows Rt 8.1 1
Microsoft Windows Server 2012 2
Microsoft Windows Server 2016 4
Microsoft Windows Server 2019 1
Opensuse Leap 2
Redhat Enterprise Linux 2
Redhat Enterprise Linux Atomic Host 1
Redhat Openshift Container Platform 1
Suse Suse Linux Enterprise Server 3

- References For CVE-2020-15705

https://www.suse.com/support/kb/doc/?id=000019673 SUSE
http://ubuntu.com/security/notices/USN-4432-1 UBUNTU
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html CONFIRM
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass UBUNTU
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot DEBIAN
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 CONFIRM
https://access.redhat.com/security/vulnerabilities/grub2bootloader REDHAT
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ CONFIRM
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ SUSE
https://www.openwall.com/lists/oss-security/2020/07/29/3 CONFIRM
http://www.openwall.com/lists/oss-security/2020/07/29/3
MLIST [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities
https://security.netapp.com/advisory/ntap-20200731-0008/ CONFIRM
https://usn.ubuntu.com/4432-1/
UBUNTU USN-4432-1
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html
SUSE openSUSE-SU-2020:1280
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html
SUSE openSUSE-SU-2020:1282
http://www.openwall.com/lists/oss-security/2021/03/02/3
MLIST [oss-security] 20210302 Multiple GRUB2 vulnerabilities
https://security.gentoo.org/glsa/202104-05
GENTOO GLSA-202104-05

- Metasploit Modules Related To CVE-2020-15705

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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